fix(templates): correct swagger annotation for is_template query param

The description said "returns only template projects" but the actual
behavior matches is_archived: it includes templates alongside normal
projects when set to true.

frontend/src/components/home/Navigation.vue

@@ -49,6 +49,16 @@
 						{{ $t('project.projects') }}
 					</RouterLink>
 				</li>
+				<li>
+					<RouterLink
+						:to="{ name: 'templates.index'}"
+					>
+						<span class="menu-item-icon icon">
+							<Icon icon="copy" />
+						</span>
+						{{ $t('project.template.title') }}
+					</RouterLink>
+				</li>
 				<li>
 					<RouterLink
 						v-shortcut="'KeyG KeyA'"

frontend/src/components/project/ProjectSettingsDropdown.vue

@@ -81,6 +81,13 @@
 			>
 				{{ $t('menu.duplicate') }}
 			</DropdownItem>
+			<DropdownItem
+				v-if="!project.isTemplate"
+				icon="copy"
+				@click="saveAsTemplate"
+			>
+				{{ $t('project.template.saveAsTemplate') }}
+			</DropdownItem>
 			<DropdownItem
 				v-tooltip="isDefaultProject ? $t('menu.cantArchiveIsDefault') : ''"
 				:to="{ name: 'project.settings.archive', params: { projectId: project.id } }"
@@ -140,6 +147,9 @@ import {useConfigStore} from '@/stores/config'
 import {useProjectStore} from '@/stores/projects'
 import {useAuthStore} from '@/stores/auth'
 import {PERMISSIONS} from '@/constants/permissions'
+import ProjectTemplateService from '@/services/projectTemplateService'
+import {success} from '@/message'
+import {useI18n} from 'vue-i18n'
 
 const props = withDefaults(defineProps<{
 	project: IProject
@@ -168,4 +178,16 @@ function setSubscriptionInStore(sub: ISubscription) {
 
 const authStore = useAuthStore()
 const isDefaultProject = computed(() => props.project?.id === authStore.settings.defaultProjectId)
+
+const {t} = useI18n({useScope: 'global'})
+
+async function saveAsTemplate() {
+	const templateService = new ProjectTemplateService()
+	const response = await templateService.create({projectId: props.project.id})
+	if (response.project) {
+		projectStore.setProject(response.project)
+	}
+	await projectStore.loadAllProjects()
+	success({message: t('project.template.saveAsTemplateSuccess')})
+}
 </script>

frontend/src/i18n/lang/en.json

@@ -394,6 +394,15 @@
       "text": "Select a parent project which should hold the duplicated project:",
       "success": "The project was successfully duplicated."
     },
+    "template": {
+      "title": "Templates",
+      "saveAsTemplate": "Save as Template",
+      "saveAsTemplateSuccess": "Project saved as template successfully.",
+      "useTemplate": "Use a template",
+      "selectTemplate": "Select a template\u2026",
+      "createFromTemplate": "Creating project from template\u2026",
+      "none": "You don't have any templates yet. Save a project as a template to get started."
+    },
     "edit": {
       "header": "Edit This Project",
       "title": "Edit \"{project}\"",

frontend/src/modelTypes/IProject.ts

@@ -12,6 +12,7 @@ export interface IProject extends IAbstract {
 	owner: IUser
 	tasks: ITask[]
 	isArchived: boolean
+	isTemplate: boolean
 	hexColor: string
 	identifier: string
 	backgroundInformation: unknown | null // FIXME: improve type

frontend/src/models/project.ts

@@ -17,6 +17,7 @@ export default class ProjectModel extends AbstractModel<IProject> implements IPr
 	owner: IUser = UserModel
 	tasks: ITask[] = []
 	isArchived = false
+	isTemplate = false
 	hexColor = ''
 	identifier = ''
 	backgroundInformation: unknown | null = null

frontend/src/router/index.ts

@@ -241,6 +241,11 @@ const router = createRouter({
 			name: 'projects.index',
 			component: () => import('@/views/project/ListProjects.vue'),
 		},
+		{
+			path: '/templates',
+			name: 'templates.index',
+			component: () => import('@/views/project/ListTemplates.vue'),
+		},
 		{
 			path: '/projects/new',
 			name: 'project.create',

frontend/src/services/projectTemplateService.ts

@@ -0,0 +1,9 @@
+import AbstractService from './abstractService'
+
+export default class ProjectTemplateService extends AbstractService {
+	constructor() {
+		super({
+			create: '/projects/{projectId}/template',
+		})
+	}
+}

frontend/src/stores/projects.ts

@@ -37,14 +37,17 @@ export const useProjectStore = defineStore('project', () => {
 	}
 
 	const notArchivedRootProjects = computed(() => projectsArray.value
-		.filter(p => !p.isArchived && p.id > 0 && (
+		.filter(p => !p.isArchived && !p.isTemplate && p.id > 0 && (
 			p.parentProjectId === 0 || isOrphanedSubProject(p)
 		)))
 	const favoriteProjects = computed(() => projectsArray.value
-		.filter(p => !p.isArchived && p.isFavorite))
+		.filter(p => !p.isArchived && !p.isTemplate && p.isFavorite))
 	const savedFilterProjects = computed(() => projectsArray.value
 		.filter(p => !p.isArchived && p.id < -1))
 	const hasProjects = computed(() => projectsArray.value.length > 0)
+	const templateProjects = computed(() => projectsArray.value
+		.filter(p => !p.isArchived && p.isTemplate))
+	const hasTemplates = computed(() => templateProjects.value.length > 0)
 
 	const getChildProjects = computed(() => {
 		return (id: IProject['id']) => projectsArray.value.filter(p => p.parentProjectId === id)
@@ -261,7 +264,7 @@ export const useProjectStore = defineStore('project', () => {
 		let page = 1
 		try {
 			do {
-				const newProjects = await projectService.getAll({}, {is_archived: true, expand: 'permissions'}, page) as IProject[]
+				const newProjects = await projectService.getAll({}, {is_archived: true, is_template: true, expand: 'permissions'}, page) as IProject[]
 				loadedProjects.push(...newProjects)
 				page++
 			} while (page <= projectService.totalPages)
@@ -329,6 +332,8 @@ export const useProjectStore = defineStore('project', () => {
 		favoriteProjects: readonly(favoriteProjects),
 		hasProjects: readonly(hasProjects),
 		savedFilterProjects: readonly(savedFilterProjects),
+		templateProjects: readonly(templateProjects),
+		hasTemplates: readonly(hasTemplates),
 
 		getChildProjects,
 		isOrphanedSubProject,

frontend/src/views/project/ListTemplates.vue

@@ -0,0 +1,48 @@
+<template>
+	<div
+		class="content loader-container"
+		:class="{'is-loading': loading}"
+	>
+		<header class="project-header">
+			<h3>{{ $t('project.template.title') }}</h3>
+		</header>
+
+		<p v-if="!loading && templates.length === 0">
+			{{ $t('project.template.none') }}
+		</p>
+
+		<ProjectCardGrid
+			v-else
+			:projects="templates"
+			:show-archived="false"
+		/>
+	</div>
+</template>
+
+<script setup lang="ts">
+import {computed} from 'vue'
+import {useI18n} from 'vue-i18n'
+
+import ProjectCardGrid from '@/components/project/partials/ProjectCardGrid.vue'
+import {useTitle} from '@/composables/useTitle'
+import {useProjectStore} from '@/stores/projects'
+import type {IProject} from '@/modelTypes/IProject'
+
+const {t} = useI18n()
+const projectStore = useProjectStore()
+
+useTitle(() => t('project.template.title'))
+
+const loading = computed(() => projectStore.isLoading)
+const templates = computed(() => projectStore.templateProjects as IProject[])
+</script>
+
+<style lang="scss" scoped>
+.project-header {
+	display: flex;
+	justify-content: space-between;
+	align-items: center;
+	gap: 1rem;
+	margin-block-end: 1rem;
+}
+</style>

frontend/src/views/project/NewProject.vue

@@ -5,6 +5,18 @@
 		:primary-disabled="project.title === ''"
 		@create="createProject()"
 	>
+		<FormField
+			v-if="projectStore.hasTemplates"
+			:label="$t('project.template.useTemplate')"
+		>
+			<Multiselect
+				v-model="selectedTemplate"
+				:options="templateOptions"
+				:placeholder="$t('project.template.selectTemplate')"
+				label="title"
+				track-by="id"
+			/>
+		</FormField>
 		<FormField
 			v-model="project.title"
 			v-focus
@@ -31,14 +43,18 @@
 </template>
 
 <script setup lang="ts">
-import {ref, reactive, shallowReactive, watch} from 'vue'
+import {ref, reactive, shallowReactive, computed, watch} from 'vue'
 import {useI18n} from 'vue-i18n'
+import {useRouter} from 'vue-router'
 
 import ProjectService from '@/services/project'
 import ProjectModel from '@/models/project'
+import ProjectDuplicateService from '@/services/projectDuplicateService'
+import ProjectDuplicateModel from '@/models/projectDuplicateModel'
 import CreateEdit from '@/components/misc/CreateEdit.vue'
 import ColorPicker from '@/components/input/ColorPicker.vue'
 import FormField from '@/components/input/FormField.vue'
+import Multiselect from '@/components/input/Multiselect.vue'
 
 import {success} from '@/message'
 import {useTitle} from '@/composables/useTitle'
@@ -51,6 +67,7 @@ const props = defineProps<{
 }>()
 
 const {t} = useI18n({useScope: 'global'})
+const router = useRouter()
 
 useTitle(() => t('project.create.header'))
 
@@ -60,6 +77,9 @@ const projectService = shallowReactive(new ProjectService())
 const projectStore = useProjectStore()
 const parentProject = ref<IProject | null>(null)
 const isSubmitting = ref(false)
+const selectedTemplate = ref<IProject | null>(null)
+
+const templateOptions = computed(() => projectStore.templateProjects as IProject[])
 
 watch(
 	() => props.parentProjectId,
@@ -85,8 +105,28 @@ async function createProject() {
 	}
 
 	try {
-		await projectStore.createProject(project)
+		if (selectedTemplate.value) {
-		success({message: t('project.create.createdSuccess')})
+			const duplicateService = new ProjectDuplicateService()
+			const duplicate = new ProjectDuplicateModel({
+				projectId: selectedTemplate.value.id,
+				parentProjectId: project.parentProjectId,
+			})
+			const response = await duplicateService.create(duplicate)
+			const newProject = response.duplicatedProject
+			if (newProject) {
+				if (project.title !== selectedTemplate.value.title) {
+					const updatedProject = await projectService.update({...newProject, title: project.title})
+					projectStore.setProject(updatedProject)
+				} else {
+					projectStore.setProject(newProject)
+				}
+				router.push({name: 'project.index', params: {projectId: newProject.id}})
+			}
+			success({message: t('project.create.createdSuccess')})
+		} else {
+			await projectStore.createProject(project)
+			success({message: t('project.create.createdSuccess')})
+		}
 	} finally {
 		isSubmitting.value = false
 	}

pkg/db/fixtures/projects.yml

@@ -393,3 +393,25 @@
   position: 4300
   updated: 2018-12-02 15:13:12
   created: 2018-12-01 15:13:12
+# Template project owned by user 1
+-
+  id: 44
+  title: Template Project
+  description: A template project for testing
+  identifier: tmpl1
+  owner_id: 1
+  is_template: 1
+  position: 44
+  updated: 2024-01-01 00:00:00
+  created: 2024-01-01 00:00:00
+# Template project owned by user 6, shared with user 1 via users_projects
+-
+  id: 45
+  title: Shared Template
+  description: A template shared with user 1
+  identifier: stmpl
+  owner_id: 6
+  is_template: 1
+  position: 45
+  updated: 2024-01-01 00:00:00
+  created: 2024-01-01 00:00:00

pkg/db/fixtures/users_projects.yml

@@ -118,3 +118,9 @@
   permission: 0
   updated: 2018-12-02 15:13:12
   created: 2018-12-01 15:13:12
+- id: 21
+  user_id: 1
+  project_id: 45
+  permission: 0
+  updated: 2024-01-01 00:00:00
+  created: 2024-01-01 00:00:00

pkg/migration/20260324193413.go

@@ -0,0 +1,43 @@
+// Vikunja is a to-do list application to facilitate your life.
+// Copyright 2018-present Vikunja and contributors. All rights reserved.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package migration
+
+import (
+	"src.techknowlogick.com/xormigrate"
+	"xorm.io/xorm"
+)
+
+type projects20260324193413 struct {
+	IsTemplate bool `xorm:"not null default false"`
+}
+
+func (projects20260324193413) TableName() string {
+	return "projects"
+}
+
+func init() {
+	migrations = append(migrations, &xormigrate.Migration{
+		ID:          "20260324193413",
+		Description: "Add is_template column to projects",
+		Migrate: func(tx *xorm.Engine) error {
+			return tx.Sync(projects20260324193413{})
+		},
+		Rollback: func(tx *xorm.Engine) error {
+			return nil
+		},
+	})
+}

pkg/models/error.go

@@ -528,6 +528,60 @@ func (err *ErrProjectViewDoesNotExist) HTTPError() web.HTTPError {
 	}
 }
 
+// ErrTemplateCannotHaveParentProject represents an error where a template project is being assigned a parent
+type ErrTemplateCannotHaveParentProject struct {
+	ProjectID int64
+}
+
+// IsErrTemplateCannotHaveParentProject checks if an error is a ErrTemplateCannotHaveParentProject.
+func IsErrTemplateCannotHaveParentProject(err error) bool {
+	_, ok := err.(*ErrTemplateCannotHaveParentProject)
+	return ok
+}
+
+func (err *ErrTemplateCannotHaveParentProject) Error() string {
+	return fmt.Sprintf("Template project cannot have a parent project [ProjectID: %d]", err.ProjectID)
+}
+
+// ErrCodeTemplateCannotHaveParentProject holds the unique world-error code of this error
+const ErrCodeTemplateCannotHaveParentProject = 3015
+
+// HTTPError holds the http error description
+func (err *ErrTemplateCannotHaveParentProject) HTTPError() web.HTTPError {
+	return web.HTTPError{
+		HTTPCode: http.StatusPreconditionFailed,
+		Code:     ErrCodeTemplateCannotHaveParentProject,
+		Message:  "Template projects cannot have a parent project.",
+	}
+}
+
+// ErrCannotMakeDefaultProjectTemplate represents an error where the default project is being made a template
+type ErrCannotMakeDefaultProjectTemplate struct {
+	ProjectID int64
+}
+
+// IsErrCannotMakeDefaultProjectTemplate checks if an error is a ErrCannotMakeDefaultProjectTemplate.
+func IsErrCannotMakeDefaultProjectTemplate(err error) bool {
+	_, ok := err.(*ErrCannotMakeDefaultProjectTemplate)
+	return ok
+}
+
+func (err *ErrCannotMakeDefaultProjectTemplate) Error() string {
+	return fmt.Sprintf("Default project cannot be made a template [ProjectID: %d]", err.ProjectID)
+}
+
+// ErrCodeCannotMakeDefaultProjectTemplate holds the unique world-error code of this error
+const ErrCodeCannotMakeDefaultProjectTemplate = 3016
+
+// HTTPError holds the http error description
+func (err *ErrCannotMakeDefaultProjectTemplate) HTTPError() web.HTTPError {
+	return web.HTTPError{
+		HTTPCode: http.StatusPreconditionFailed,
+		Code:     ErrCodeCannotMakeDefaultProjectTemplate,
+		Message:  "This project cannot be made a template because it is the default project of a user.",
+	}
+}
+
 // ==============
 // Task errors
 // ==============

pkg/models/project.go

@@ -58,6 +58,9 @@ type Project struct {
 	// Whether a project is archived.
 	IsArchived bool `xorm:"not null default false" json:"is_archived" query:"is_archived"`
 
+	// Whether a project is a template.
+	IsTemplate bool `xorm:"not null default false" json:"is_template" query:"is_template"`
+
 	// The id of the file this project has set as background
 	BackgroundFileID int64 `xorm:"null" json:"-"`
 	// Holds extra information about the background set since some background providers require attribution or similar. If not null, the background can be accessed at /projects/{projectID}/background
@@ -168,6 +171,7 @@ var FavoritesPseudoProject = Project{
 // @Param per_page query int false "The maximum number of items per page. Note this parameter is limited by the configured maximum of items per page."
 // @Param s query string false "Search projects by title."
 // @Param is_archived query bool false "If true, also returns all archived projects."
+// @Param is_template query bool false "If true, also returns all template projects."
 // @Param expand query string false "If set to `permissions`, Vikunja will return the max permission the current user has on this project. You can currently only set this to `permissions`."
 // @Security JWTKeyAuth
 // @Success 200 {array} models.Project "The projects"
@@ -175,7 +179,7 @@ var FavoritesPseudoProject = Project{
 // @Failure 500 {object} models.Message "Internal error"
 // @Router /projects [get]
 func (p *Project) ReadAll(s *xorm.Session, a web.Auth, search string, page int, perPage int) (result interface{}, resultCount int, totalItems int64, err error) {
-	prs, resultCount, totalItems, err := getAllRawProjects(s, a, search, page, perPage, p.IsArchived, false)
+	prs, resultCount, totalItems, err := getAllRawProjects(s, a, search, page, perPage, p.IsArchived, p.IsTemplate, false)
 	if err != nil {
 		return nil, 0, 0, err
 	}
@@ -216,9 +220,9 @@ func (p *Project) ReadAll(s *xorm.Session, a web.Auth, search string, page int,
 	return prs, resultCount, totalItems, err
 }
 
-func getAllRawProjects(s *xorm.Session, a web.Auth, search string, page int, perPage int, isArchived, listAll bool) (projects []*Project, resultCount int, totalItems int64, err error) {
+func getAllRawProjects(s *xorm.Session, a web.Auth, search string, page int, perPage int, isArchived, isTemplate, listAll bool) (projects []*Project, resultCount int, totalItems int64, err error) {
 	if listAll {
-		return getRawProjectsUnscoped(s, search, page, perPage, isArchived)
+		return getRawProjectsUnscoped(s, search, page, perPage, isArchived, isTemplate)
 	}
 
 	// Check if we're dealing with a share auth
@@ -244,11 +248,12 @@ func getAllRawProjects(s *xorm.Session, a web.Auth, search string, page int, per
 	prs, resultCount, totalItems, err := getRawProjectsForUser(
 		s,
 		&projectOptions{
-			search:      search,
+			search:       search,
-			user:        doer,
+			user:         doer,
-			page:        page,
+			page:         page,
-			perPage:     perPage,
+			perPage:      perPage,
-			getArchived: isArchived,
+			getArchived:  isArchived,
+			getTemplates: isTemplate,
 		})
 	if err != nil {
 		return nil, 0, 0, err
@@ -271,7 +276,7 @@ func getAllRawProjects(s *xorm.Session, a web.Auth, search string, page int, per
 
 // ListAllProjects returns every project with owners hydrated; callers must authorize since this bypasses the per-user permission filter.
 func ListAllProjects(s *xorm.Session, search string, page, perPage int, isArchived bool) (projects []*Project, resultCount int, totalItems int64, err error) {
-	projects, resultCount, totalItems, err = getAllRawProjects(s, nil, search, page, perPage, isArchived, true)
+	projects, resultCount, totalItems, err = getAllRawProjects(s, nil, search, page, perPage, isArchived, true, true)
 	if err != nil {
 		return nil, 0, 0, err
 	}
@@ -293,13 +298,16 @@ func ListAllProjects(s *xorm.Session, search string, page, perPage int, isArchiv
 	return projects, resultCount, totalItems, nil
 }
 
-func getRawProjectsUnscoped(s *xorm.Session, search string, page, perPage int, isArchived bool) (projects []*Project, resultCount int, totalItems int64, err error) {
+func getRawProjectsUnscoped(s *xorm.Session, search string, page, perPage int, isArchived, isTemplate bool) (projects []*Project, resultCount int, totalItems int64, err error) {
 	limit, start := getLimitFromPageIndex(page, perPage)
 
 	conds := []builder.Cond{}
 	if !isArchived {
 		conds = append(conds, builder.Eq{"is_archived": false})
 	}
+	if !isTemplate {
+		conds = append(conds, builder.Eq{"is_template": false})
+	}
 	if search != "" {
 		ids := []int64{}
 		for _, val := range strings.Split(search, ",") {
@@ -525,11 +533,12 @@ func GetProjectsByIDs(s *xorm.Session, projectIDs []int64) (projects []*Project,
 }
 
 type projectOptions struct {
-	search      string
+	search       string
-	user        *user.User
+	user         *user.User
-	page        int
+	page         int
-	perPage     int
+	perPage      int
-	getArchived bool
+	getArchived  bool
+	getTemplates bool
 }
 
 func getUserProjectsStatement(userID int64, search string) *builder.Builder {
@@ -584,7 +593,7 @@ func getUserProjectsStatement(userID int64, search string) *builder.Builder {
 	}
 
 	return builder.
-		Select("l.id, l.title, l.description, l.identifier, l.hex_color, l.owner_id, l.parent_project_id, l.is_archived, l.background_file_id, l.background_blur_hash, l.position, l.created, l.updated").
+		Select("l.id, l.title, l.description, l.identifier, l.hex_color, l.owner_id, l.parent_project_id, l.is_archived, l.is_template, l.background_file_id, l.background_blur_hash, l.position, l.created, l.updated").
 		From("projects", "l").
 		Join("LEFT", "team_projects tl", "tl.project_id = l.id").
 		Join("LEFT", "team_members tm2", "tm2.team_id = tl.team_id").
@@ -649,7 +658,7 @@ func getAllProjectsForUser(s *xorm.Session, userID int64, opts *projectOptions)
 
 	baseQuery := querySQLString + `
 UNION ALL
-SELECT p.id, p.title, p.description, p.identifier, p.hex_color, p.owner_id, p.parent_project_id, (ap.is_archived OR p.is_archived) AS is_archived, p.background_file_id, p.background_blur_hash, p.position, p.created, p.updated FROM projects p
+SELECT p.id, p.title, p.description, p.identifier, p.hex_color, p.owner_id, p.parent_project_id, (ap.is_archived OR p.is_archived) AS is_archived, p.is_template, p.background_file_id, p.background_blur_hash, p.position, p.created, p.updated FROM projects p
 INNER JOIN all_projects ap ON p.parent_project_id = ap.id`
 
 	columnStr := strings.Join([]string{
@@ -661,6 +670,7 @@ INNER JOIN all_projects ap ON p.parent_project_id = ap.id`
 		"all_projects.owner_id",
 		"CASE WHEN all_projects.parent_project_id IS NULL THEN 0 ELSE all_projects.parent_project_id END AS parent_project_id",
 		"MAX(CASE WHEN all_projects.is_archived THEN 1 ELSE 0 END) AS is_archived",
+		"MAX(CASE WHEN all_projects.is_template THEN 1 ELSE 0 END) AS is_template",
 		"all_projects.background_file_id",
 		"all_projects.background_blur_hash",
 		"all_projects.position",
@@ -683,15 +693,22 @@ INNER JOIN all_projects ap ON p.parent_project_id = ap.id`
 		"all_projects.updated",
 	}, ", ")
 
-	var archivedFilter string
+	var havingClauses []string
 	if !opts.getArchived {
-		archivedFilter = "HAVING MAX(CASE WHEN all_projects.is_archived THEN 1 ELSE 0 END) = 0 "
+		havingClauses = append(havingClauses, "MAX(CASE WHEN all_projects.is_archived THEN 1 ELSE 0 END) = 0")
+	}
+	if !opts.getTemplates {
+		havingClauses = append(havingClauses, "MAX(CASE WHEN all_projects.is_template THEN 1 ELSE 0 END) = 0")
+	}
+	var havingFilter string
+	if len(havingClauses) > 0 {
+		havingFilter = "HAVING " + strings.Join(havingClauses, " AND ") + " "
 	}
 
 	currentProjects := []*Project{}
 	err = s.SQL(`WITH RECURSIVE all_projects as (`+baseQuery+`)
 SELECT `+columnStr+` FROM all_projects
-GROUP BY `+groupByStr+` `+archivedFilter+`ORDER BY all_projects.position `+limitSQL, args...).Find(&currentProjects)
+GROUP BY `+groupByStr+` `+havingFilter+`ORDER BY all_projects.position `+limitSQL, args...).Find(&currentProjects)
 	if err != nil {
 		return
 	}
@@ -702,7 +719,7 @@ GROUP BY `+groupByStr+` `+archivedFilter+`ORDER BY all_projects.position `+limit
 
 	totalCount, err = s.
 		SQL(`WITH RECURSIVE all_projects as (`+baseQuery+`)
-SELECT COUNT(*) FROM (SELECT all_projects.id FROM all_projects GROUP BY all_projects.id `+archivedFilter+`) sub`, args...).
+SELECT COUNT(*) FROM (SELECT all_projects.id FROM all_projects GROUP BY all_projects.id `+havingFilter+`) sub`, args...).
 		Count(&Project{})
 	if err != nil {
 		return nil, 0, err
@@ -956,6 +973,10 @@ func checkProjectBeforeUpdateOrDelete(s *xorm.Session, project *Project) (err er
 		return &ErrProjectCannotBelongToAPseudoParentProject{ProjectID: project.ID, ParentProjectID: project.ParentProjectID}
 	}
 
+	if project.IsTemplate && project.ParentProjectID != 0 {
+		return &ErrTemplateCannotHaveParentProject{ProjectID: project.ID}
+	}
+
 	// Check if the parent project exists
 	if project.ParentProjectID > 0 {
 		if project.ParentProjectID == project.ID {
@@ -1148,6 +1169,17 @@ func UpdateProject(s *xorm.Session, project *Project, auth web.Auth, updateProje
 		}
 	}
 
+	if project.IsTemplate {
+		isDefaultProject, err := project.isDefaultProject(s)
+		if err != nil {
+			return err
+		}
+
+		if isDefaultProject {
+			return &ErrCannotMakeDefaultProjectTemplate{ProjectID: project.ID}
+		}
+	}
+
 	err = setArchiveStateForProjectDescendants(s, project.ID, project.IsArchived)
 	if err != nil {
 		return err
@@ -1157,6 +1189,7 @@ func UpdateProject(s *xorm.Session, project *Project, auth web.Auth, updateProje
 	colsToUpdate := []string{
 		"title",
 		"is_archived",
+		"is_template",
 		"identifier",
 		"hex_color",
 		"parent_project_id",

pkg/models/project_duplicate.go

@@ -38,6 +38,13 @@ type ProjectDuplicate struct {
 	// The copied project
 	Project *Project `json:"duplicated_project,omitempty"`
 
+	// If true, skip copying user/team permissions and link shares
+	SkipPermissions bool `json:"-"`
+	// If true, skip copying task assignees and comments
+	SkipAssigneesAndComments bool `json:"-"`
+	// If true, the duplicated project will be marked as a template
+	IsTemplate bool `json:"-"`
+
 	web.Permissions `json:"-"`
 	web.CRUDable    `json:"-"`
 }
@@ -85,7 +92,15 @@ func (pd *ProjectDuplicate) Create(s *xorm.Session, doer web.Auth) (err error) {
 	pd.Project.ParentProjectID = pd.ParentProjectID
 	// Set the owner to the current user
 	pd.Project.OwnerID = doer.GetID()
-	pd.Project.Title += " - duplicate"
+
+	if pd.IsTemplate {
+		pd.Project.IsTemplate = true
+		pd.Project.ParentProjectID = 0
+		pd.SkipPermissions = true
+		pd.SkipAssigneesAndComments = true
+	} else {
+		pd.Project.Title += " - duplicate"
+	}
 	err = CreateProject(s, pd.Project, doer, false, false)
 	if err != nil {
 		// If there is no available unique project identifier, just reset it.
@@ -117,56 +132,58 @@ func (pd *ProjectDuplicate) Create(s *xorm.Session, doer web.Auth) (err error) {
 		return
 	}
 
-	// Permissions / Shares
+	if !pd.SkipPermissions {
-	// To keep it simple(r) we will only copy permissions which are directly used with the project, not the parent
+		// Permissions / Shares
-	users := []*ProjectUser{}
+		// To keep it simple(r) we will only copy permissions which are directly used with the project, not the parent
-	err = s.Where("project_id = ?", pd.ProjectID).Find(&users)
+		users := []*ProjectUser{}
-	if err != nil {
+		err = s.Where("project_id = ?", pd.ProjectID).Find(&users)
-		return
-	}
-	for _, u := range users {
-		u.ID = 0
-		u.ProjectID = pd.Project.ID
-		if _, err := s.Insert(u); err != nil {
-			return err
-		}
-	}
-
-	log.Debugf("Duplicated user shares from project %d into %d", pd.ProjectID, pd.Project.ID)
-
-	teams := []*TeamProject{}
-	err = s.Where("project_id = ?", pd.ProjectID).Find(&teams)
-	if err != nil {
-		return
-	}
-	for _, t := range teams {
-		t.ID = 0
-		t.ProjectID = pd.Project.ID
-		if _, err := s.Insert(t); err != nil {
-			return err
-		}
-	}
-
-	// Generate new link shares if any are available
-	linkShares := []*LinkSharing{}
-	err = s.Where("project_id = ?", pd.ProjectID).Find(&linkShares)
-	if err != nil {
-		return
-	}
-	for _, share := range linkShares {
-		share.ID = 0
-		share.ProjectID = pd.Project.ID
-		hash, err := utils.CryptoRandomString(40)
 		if err != nil {
-			return err
+			return
 		}
-		share.Hash = hash
+		for _, u := range users {
-		if _, err := s.Insert(share); err != nil {
+			u.ID = 0
-			return err
+			u.ProjectID = pd.Project.ID
+			if _, err := s.Insert(u); err != nil {
+				return err
+			}
 		}
-	}
 
-	log.Debugf("Duplicated all link shares from project %d into %d", pd.ProjectID, pd.Project.ID)
+		log.Debugf("Duplicated user shares from project %d into %d", pd.ProjectID, pd.Project.ID)
+
+		teams := []*TeamProject{}
+		err = s.Where("project_id = ?", pd.ProjectID).Find(&teams)
+		if err != nil {
+			return
+		}
+		for _, t := range teams {
+			t.ID = 0
+			t.ProjectID = pd.Project.ID
+			if _, err := s.Insert(t); err != nil {
+				return err
+			}
+		}
+
+		// Generate new link shares if any are available
+		linkShares := []*LinkSharing{}
+		err = s.Where("project_id = ?", pd.ProjectID).Find(&linkShares)
+		if err != nil {
+			return
+		}
+		for _, share := range linkShares {
+			share.ID = 0
+			share.ProjectID = pd.Project.ID
+			hash, err := utils.CryptoRandomString(40)
+			if err != nil {
+				return err
+			}
+			share.Hash = hash
+			if _, err := s.Insert(share); err != nil {
+				return err
+			}
+		}
+
+		log.Debugf("Duplicated all link shares from project %d into %d", pd.ProjectID, pd.Project.ID)
+	}
 
 	err = pd.Project.ReadOne(s, doer)
 	return
@@ -431,43 +448,45 @@ func duplicateTasks(s *xorm.Session, doer web.Auth, ld *ProjectDuplicate) (newTa
 
 	log.Debugf("Duplicated all labels from project %d into %d", ld.ProjectID, ld.Project.ID)
 
-	// Assignees
+	if !ld.SkipAssigneesAndComments {
-	// Only copy those assignees who have access to the task
+		// Assignees
-	assignees := []*TaskAssginee{}
+		// Only copy those assignees who have access to the task
-	err = s.In("task_id", oldTaskIDs).Find(&assignees)
+		assignees := []*TaskAssginee{}
-	if err != nil {
+		err = s.In("task_id", oldTaskIDs).Find(&assignees)
-		return
+		if err != nil {
-	}
+			return
-	for _, a := range assignees {
-		t := &Task{
-			ID:        newTaskIDs[a.TaskID],
-			ProjectID: ld.Project.ID,
 		}
-		if err := t.addNewAssigneeByID(s, a.UserID, ld.Project, doer); err != nil {
+		for _, a := range assignees {
-			if IsErrUserDoesNotHaveAccessToProject(err) {
+			t := &Task{
-				continue
+				ID:        newTaskIDs[a.TaskID],
+				ProjectID: ld.Project.ID,
+			}
+			if err := t.addNewAssigneeByID(s, a.UserID, ld.Project, doer); err != nil {
+				if IsErrUserDoesNotHaveAccessToProject(err) {
+					continue
+				}
+				return nil, err
 			}
-			return nil, err
 		}
-	}
 
-	log.Debugf("Duplicated all assignees from project %d into %d", ld.ProjectID, ld.Project.ID)
+		log.Debugf("Duplicated all assignees from project %d into %d", ld.ProjectID, ld.Project.ID)
 
-	// Comments
+		// Comments
-	comments := []*TaskComment{}
+		comments := []*TaskComment{}
-	err = s.In("task_id", oldTaskIDs).Find(&comments)
+		err = s.In("task_id", oldTaskIDs).Find(&comments)
-	if err != nil {
+		if err != nil {
-		return
+			return
-	}
+		}
-	for _, c := range comments {
+		for _, c := range comments {
-		c.ID = 0
+			c.ID = 0
-		c.TaskID = newTaskIDs[c.TaskID]
+			c.TaskID = newTaskIDs[c.TaskID]
-		if _, err := s.Insert(c); err != nil {
+			if _, err := s.Insert(c); err != nil {
-			return nil, err
+				return nil, err
+			}
 		}
-	}
 
-	log.Debugf("Duplicated all comments from project %d into %d", ld.ProjectID, ld.Project.ID)
+		log.Debugf("Duplicated all comments from project %d into %d", ld.ProjectID, ld.Project.ID)
+	}
 
 	// Relations in that project
 	// Low-Effort: Only copy those relations which are between tasks in the same project

pkg/models/project_template.go

@@ -0,0 +1,79 @@
+// Vikunja is a to-do list application to facilitate your life.
+// Copyright 2018-present Vikunja and contributors. All rights reserved.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package models
+
+import (
+	"code.vikunja.io/api/pkg/log"
+	"code.vikunja.io/api/pkg/web"
+
+	"xorm.io/xorm"
+)
+
+// ProjectTemplate represents the action of promoting a project to a template
+type ProjectTemplate struct {
+	// The project id of the project to save as template
+	ProjectID int64 `json:"-" param:"projectid"`
+
+	// The resulting template project
+	Project *Project `json:"project,omitempty"`
+
+	web.Permissions `json:"-"`
+	web.CRUDable    `json:"-"`
+}
+
+// CanCreate checks if a user has the permission to create a template from a project
+func (pt *ProjectTemplate) CanCreate(s *xorm.Session, a web.Auth) (canCreate bool, err error) {
+	p := &Project{ID: pt.ProjectID}
+	canCreate, _, err = p.CanRead(s, a)
+	return canCreate, err
+}
+
+// Create duplicates a project and marks the copy as a template
+// @Summary Save a project as a template
+// @Description Creates a template by duplicating the project structure (tasks, views, buckets, backgrounds) without permissions, shares, assignees, or comments.
+// @tags project
+// @Accept json
+// @Produce json
+// @Security JWTKeyAuth
+// @Param projectid path int true "The project ID to save as template"
+// @Success 201 {object} models.ProjectTemplate "The created template"
+// @Failure 403 {object} web.HTTPError "The user does not have access to the project"
+// @Failure 500 {object} models.Message "Internal error"
+// @Router /projects/{projectid}/template [put]
+func (pt *ProjectTemplate) Create(s *xorm.Session, doer web.Auth) (err error) {
+	log.Debugf("Creating template from project %d", pt.ProjectID)
+
+	pd := &ProjectDuplicate{
+		ProjectID:  pt.ProjectID,
+		IsTemplate: true,
+	}
+
+	// Read the source project so the duplicate has something to work with
+	pd.Project = &Project{ID: pt.ProjectID}
+	err = pd.Project.ReadOne(s, doer)
+	if err != nil {
+		return err
+	}
+
+	err = pd.Create(s, doer)
+	if err != nil {
+		return err
+	}
+
+	pt.Project = pd.Project
+	return
+}

pkg/routes/routes.go

@@ -604,6 +604,13 @@ func registerAPIRoutes(a *echo.Group) {
 	}
 	a.PUT("/projects/:projectid/duplicate", projectDuplicateHandler.CreateWeb)
 
+	projectTemplateHandler := &handler.WebHandler{
+		EmptyStruct: func() handler.CObject {
+			return &models.ProjectTemplate{}
+		},
+	}
+	a.PUT("/projects/:projectid/template", projectTemplateHandler.CreateWeb)
+
 	taskHandler := &handler.WebHandler{
 		EmptyStruct: func() handler.CObject {
 			return &models.Task{}

pkg/webtests/project_test.go

@@ -94,6 +94,20 @@ func TestProject(t *testing.T) {
 				}
 			}
 		})
+		t.Run("Templates excluded by default", func(t *testing.T) {
+			rec, err := testHandler.testReadAllWithUser(nil, nil)
+			require.NoError(t, err)
+			assert.NotContains(t, rec.Body.String(), `"is_template":true`)
+			assert.NotContains(t, rec.Body.String(), `Template Project`)
+			assert.NotContains(t, rec.Body.String(), `Shared Template`)
+		})
+		t.Run("Including templates", func(t *testing.T) {
+			rec, err := testHandler.testReadAllWithUser(url.Values{"is_template": []string{"true"}}, nil)
+			require.NoError(t, err)
+			assert.Contains(t, rec.Body.String(), `Template Project`)
+			assert.Contains(t, rec.Body.String(), `Shared Template`)
+			assert.Contains(t, rec.Body.String(), `Test1`)
+		})
 	})
 	t.Run("ReadOne", func(t *testing.T) {
 		t.Run("Normal", func(t *testing.T) {
@@ -465,5 +479,45 @@ func TestProject(t *testing.T) {
 				assert.NotContains(t, rec.Body.String(), `"tasks":`)
 			})
 		})
+		t.Run("Template cannot have parent project", func(t *testing.T) {
+			_, err := testHandler.testCreateWithUser(nil, nil, `{"title":"Test Template","is_template":true,"parent_project_id":1}`)
+			require.Error(t, err)
+			assertHandlerErrorCode(t, err, models.ErrCodeTemplateCannotHaveParentProject)
+		})
+		t.Run("Template as top-level project", func(t *testing.T) {
+			rec, err := testHandler.testCreateWithUser(nil, nil, `{"title":"Test Template","is_template":true}`)
+			require.NoError(t, err)
+			assert.Contains(t, rec.Body.String(), `"title":"Test Template"`)
+			assert.Contains(t, rec.Body.String(), `"is_template":true`)
+		})
+	})
+}
+
+func TestProjectTemplate(t *testing.T) {
+	testHandler := webHandlerTest{
+		user: &testuser1,
+		strFunc: func() handler.CObject {
+			return &models.ProjectTemplate{}
+		},
+		t: t,
+	}
+
+	t.Run("Save as template", func(t *testing.T) {
+		rec, err := testHandler.testCreateWithUser(nil, map[string]string{"projectid": "3"}, `{}`)
+		require.NoError(t, err)
+		assert.Contains(t, rec.Body.String(), `"is_template":true`)
+	})
+
+	t.Run("No access to source project", func(t *testing.T) {
+		noAccessHandler := webHandlerTest{
+			user: &testuser15,
+			strFunc: func() handler.CObject {
+				return &models.ProjectTemplate{}
+			},
+			t: t,
+		}
+		_, err := noAccessHandler.testCreateWithUser(nil, map[string]string{"projectid": "1"}, `{}`)
+		require.Error(t, err)
+		assert.Contains(t, getHTTPErrorMessage(err), `Forbidden`)
 	})
 }