Added GroupPinnedStatuses

• Added:
- GroupPinnedStatuses
- controllers for timeline, creation, deletion
- redux actions, reducers for creation, deletion
- timeline fetching in timelines action
- options to pin, unpin in status options popover for group admin

app/controllers/api/v1/groups/pins_controller.rb

@@ -0,0 +1,38 @@
+# frozen_string_literal: true
+
+class Api::V1::Groups::PinsController < Api::BaseController
+  include Authorization
+
+  before_action -> { doorkeeper_authorize! :write, :'write:groups' }
+  before_action :require_user!
+  before_action :set_group
+  before_action :set_status
+
+  respond_to :json
+
+  def create
+    GroupPinnedStatus.create!(group: @group, status: @status)
+    render json: @status, serializer: REST::StatusSerializer
+  end
+
+  def destroy
+    pin = GroupPinnedStatus.find_by(group: @group, status: @status)
+
+    if pin
+      pin.destroy!
+    end
+
+    render json: @status, serializer: REST::StatusSerializer
+  end
+
+  private
+
+  def set_status
+    @status = Status.find(params[:statusId])
+  end
+
+  def set_group
+    @group = Group.find(params[:group_id])
+  end
+
+end

app/controllers/api/v1/timelines/group_controller.rb

@@ -13,7 +13,7 @@ class Api::V1::Timelines::GroupController < Api::BaseController
     if current_user
       render json: @statuses,
             each_serializer: REST::StatusSerializer,
-            relationships: StatusRelationshipsPresenter.new(@statuses, current_user.account_id)
+            relationships: StatusRelationshipsPresenter.new(@statuses, current_user.account_id, group_id: @group.id)
     else
       render json: @statuses, each_serializer: REST::StatusSerializer
     end

app/controllers/api/v1/timelines/group_pins_controller.rb

@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+class Api::V1::Timelines::GroupPinsController < Api::BaseController
+  before_action :set_group
+  before_action :set_statuses
+
+  def show
+    if current_user
+      render json: @statuses,
+            each_serializer: REST::StatusSerializer,
+            relationships: StatusRelationshipsPresenter.new(@statuses, current_user.account_id, group_id: @group.id)
+    else
+      render json: @statuses, each_serializer: REST::StatusSerializer
+    end
+  end
+
+  private
+
+  def set_group
+    @group = Group.where(id: params[:id], is_archived: false).first
+  end
+
+  def set_statuses
+    @statuses = cached_group_statuses
+  end
+
+  def cached_group_statuses
+    cache_collection group_statuses, Status
+  end
+
+  def group_statuses
+    statuses = []
+    @group.pinned_statuses.each do |s|
+      statuses << s
+    end
+    statuses
+  end
+
+end

app/javascript/gabsocial/actions/groups.js

@@ -63,6 +63,14 @@ export const GROUP_UPDATE_ROLE_REQUEST = 'GROUP_UPDATE_ROLE_REQUEST';
 export const GROUP_UPDATE_ROLE_SUCCESS = 'GROUP_UPDATE_ROLE_SUCCESS';
 export const GROUP_UPDATE_ROLE_FAIL    = 'GROUP_UPDATE_ROLE_FAIL';
 
+export const GROUP_PIN_STATUS_REQUEST = 'GROUP_PIN_STATUS_REQUEST'
+export const GROUP_PIN_STATUS_SUCCESS = 'GROUP_PIN_STATUS_SUCCESS'
+export const GROUP_PIN_STATUS_FAIL = 'GROUP_PIN_STATUS_FAIL'
+
+export const GROUP_UNPIN_STATUS_REQUEST = 'GROUP_UNPIN_STATUS_REQUEST'
+export const GROUP_UNPIN_STATUS_SUCCESS = 'GROUP_UNPIN_STATUS_SUCCESS'
+export const GROUP_UNPIN_STATUS_FAIL = 'GROUP_UNPIN_STATUS_FAIL ='
+
 export const GROUP_TIMELINE_SORT = 'GROUP_TIMELINE_SORT'
 export const GROUP_TIMELINE_TOP_SORT = 'GROUP_TIMELINE_TOP_SORT'
 
@@ -587,6 +595,83 @@ export function updateRoleFail(groupId, id, error) {
   };
 };
 
+
+export function pinGroupStatus(groupId, statusId) {
+  return (dispatch, getState) => {
+    if (!me) return
+
+    dispatch(pinGroupStatusRequest(groupId))
+
+    api(getState).post(`/api/v1/groups/${groupId}/pin`, { statusId }).then((response) => {
+      dispatch(pinGroupStatusSuccess(groupId, statusId))
+    }).catch((error) => {
+      dispatch(pinGroupStatusFail(groupId, statusId, error))
+    })
+  }
+}
+
+export function pinGroupStatusRequest(groupId) {
+  return {
+    type: GROUP_PIN_STATUS_REQUEST,
+    groupId,
+  }
+}
+
+export function pinGroupStatusSuccess(groupId, statusId) {
+  return {
+    type: GROUP_PIN_STATUS_SUCCESS,
+    groupId,
+    statusId,
+  }
+}
+
+export function pinGroupStatusFail(groupId, statusId, error) {
+  return {
+    type: GROUP_PIN_STATUS_FAIL,
+    groupId,
+    statusId,
+    error,
+  }
+}
+
+export function unpinGroupStatus(groupId, statusId) {
+  return (dispatch, getState) => {
+    if (!me) return
+
+    dispatch(unpinGroupStatusRequest(groupId))
+
+    api(getState).post(`/api/v1/groups/${groupId}/unpin`, { statusId }).then((response) => {
+      dispatch(unpinGroupStatusSuccess(groupId, statusId))
+    }).catch((error) => {
+      dispatch(unpinGroupStatusFail(groupId, statusId, error))
+    })
+  }
+}
+
+export function unpinGroupStatusRequest(groupId) {
+  return {
+    type: GROUP_UNPIN_STATUS_REQUEST,
+    groupId,
+  }
+}
+
+export function unpinGroupStatusSuccess(groupId, statusId) {
+  return {
+    type: GROUP_UNPIN_STATUS_SUCCESS,
+    groupId,
+    statusId,
+  }
+}
+
+export function unpinGroupStatusFail(groupId, statusId, error) {
+  return {
+    type: GROUP_UNPIN_STATUS_FAIL,
+    groupId,
+    statusId,
+    error,
+  }
+}
+
 export const sortGroups = (tab, sortType) => (dispatch, getState) => {
   const groupIdsByTab = getState().getIn(['group_lists', tab, 'items'], ImmutableList()).toJS()
   const allGroups = getState().get('groups', ImmutableMap()).toJS()

app/javascript/gabsocial/actions/timelines.js

@@ -173,6 +173,7 @@ export const expandAccountFeaturedTimeline = accountId => expandTimeline(`accoun
 export const expandAccountMediaTimeline = (accountId, { maxId, limit, mediaType } = {}) => expandTimeline(`account:${accountId}:media`, `/api/v1/accounts/${accountId}/statuses`, { max_id: maxId, only_media: true, limit: limit || 20, media_type: mediaType });
 export const expandListTimeline = (id, { maxId } = {}, done = noOp) => expandTimeline(`list:${id}`, `/api/v1/timelines/list/${id}`, { max_id: maxId }, done);
 export const expandGroupTimeline = (id, { sortBy, maxId, onlyMedia } = {}, done = noOp) => expandTimeline(`group:${id}`, `/api/v1/timelines/group/${id}`, { sort_by: sortBy, max_id: maxId, only_media: onlyMedia }, done);
+export const expandGroupFeaturedTimeline = (groupId, done = noOp) => expandTimeline(`group:${groupId}:pinned`, `/api/v1/timelines/group_pins/${groupId}`, {}, done);
 export const expandGroupCollectionTimeline = (collectionType, { sortBy, maxId } = {}, done = noOp) => expandTimeline(`group_collection:${collectionType}`, `/api/v1/timelines/group_collection/${collectionType}`, { sort_by: sortBy, max_id: maxId }, done);
 export const expandHashtagTimeline = (hashtag, { maxId, tags } = {}, done = noOp) => {
   return expandTimeline(`hashtag:${hashtag}`, `/api/v1/timelines/tag/${hashtag}`, {

app/javascript/gabsocial/components/popover/status_options_popover.js

@@ -24,6 +24,8 @@ import {
   fetchGroupRelationships,
   createRemovedAccount,
   groupRemoveStatus,
+  pinGroupStatus,
+  unpinGroupStatus,
 } from '../../actions/groups'
 import { initMuteModal } from '../../actions/mutes'
 import { initReport } from '../../actions/reports'
@@ -86,6 +88,10 @@ class StatusOptionsPopover extends ImmutablePureComponent {
     this.props.onPin(this.props.status)
   }
 
+  handleGroupPinStatus = () => {
+    this.props.onPinGroupStatus(this.props.status)
+  }
+
   handleBookmarkClick = () => {
     if (this.props.isPro) {
       this.props.onBookmark(this.props.status)
@@ -230,6 +236,29 @@ class StatusOptionsPopover extends ImmutablePureComponent {
       }
     }
 
+    if (withGroupAdmin) {
+      menu.push(null)
+      menu.push({
+        icon: 'trash',
+        hideArrow: true,
+        title: intl.formatMessage(messages.group_remove_account),
+        onClick: this.handleGroupRemoveAccount,
+      })
+      menu.push({
+        icon: 'trash',
+        hideArrow: true,
+        title: intl.formatMessage(messages.group_remove_post),
+        onClick: this.handleGroupRemovePost,
+      })
+      menu.push(null)
+      menu.push({
+        icon: 'pin',
+        hideArrow: true,
+        title: intl.formatMessage(status.get('pinned_by_group') ? messages.groupUnpin : messages.groupPin),
+        onClick: this.handleGroupPinStatus,
+      })
+    }
+
     menu.push(null)
     menu.push({
       icon: 'copy',
@@ -249,22 +278,6 @@ class StatusOptionsPopover extends ImmutablePureComponent {
       title: intl.formatMessage(messages.embed),
       onClick: this.handleOnOpenEmbedModal,
     })
-
-    if (withGroupAdmin) {
-      menu.push(null)
-      menu.push({
-        icon: 'trash',
-        hideArrow: true,
-        title: intl.formatMessage(messages.group_remove_account),
-        onClick: this.handleGroupRemoveAccount,
-      })
-      menu.push({
-        icon: 'trash',
-        hideArrow: true,
-        title: intl.formatMessage(messages.group_remove_post),
-        onClick: this.handleGroupRemovePost,
-      })
-    }
     
     if (isStaff) {
       menu.push(null)
@@ -316,6 +329,8 @@ const messages = defineMessages({
   unmuteConversation: { id: 'status.unmute_conversation', defaultMessage: 'Unmute conversation' },
   pin: { id: 'status.pin', defaultMessage: 'Pin on profile' },
   unpin: { id: 'status.unpin', defaultMessage: 'Unpin from profile' },
+  groupPin: { id: 'status.group_pin', defaultMessage: 'Pin in group' },
+  groupUnpin: { id: 'status.group_unpin', defaultMessage: 'Unpin from group' },
   bookmark: { id: 'status.bookmark', defaultMessage: 'Bookmark status' },
   unbookmark: { id: 'status.unbookmark', defaultMessage: 'Remove bookmark' },
   admin_account: { id: 'status.admin_account', defaultMessage: 'Open moderation interface for @{name}' },
@@ -471,6 +486,16 @@ const mapDispatchToProps = (dispatch) => ({
     dispatch(openModal(MODAL_PRO_UPGRADE))
   },
 
+  onPinGroupStatus(status) {
+    dispatch(closePopover())
+
+    if (status.get('pinned_by_group')) {
+      dispatch(unpinGroupStatus(status.getIn(['group', 'id']), status.get('id')))
+    } else {
+      dispatch(pinGroupStatus(status.getIn(['group', 'id']), status.get('id')))
+    }
+  },
+
   onClosePopover: () => dispatch(closePopover()),
 })
 

app/javascript/gabsocial/components/status.js

@@ -82,6 +82,7 @@ class Status extends ImmutablePureComponent {
     'isChild',
     'isPromoted',
     'isFeatured',
+    'isPinnedInGroup',
     'isMuted',
     'isHidden',
     'isIntersecting',
@@ -311,6 +312,7 @@ class Status extends ImmutablePureComponent {
     const {
       intl,
       isFeatured,
+      isPinnedInGroup,
       isPromoted,
       isChild,
       isHidden,
@@ -429,7 +431,7 @@ class Status extends ImmutablePureComponent {
             <div
               className={[_s.d, _s.outlineNone].join(' ')}
               tabIndex={this.props.isMuted ? null : 0}
-              data-featured={isFeatured ? 'true' : null}
+              data-featured={(isFeatured || isPinnedInGroup) ? 'true' : null}
               aria-label={textForScreenReader(intl, status, rebloggedByText)}
               ref={this.handleRef}
               onClick={isChild && !isNotification ? this.handleClick : undefined}
@@ -442,6 +444,7 @@ class Status extends ImmutablePureComponent {
                     status={this.props.status}
                     isPromoted={isPromoted}
                     isFeatured={isFeatured}
+                    isPinnedInGroup={isPinnedInGroup}
                     isComment={isComment && !isChild}
                   />
 
@@ -564,6 +567,7 @@ Status.propTypes = {
   isChild: PropTypes.bool,
   isPromoted: PropTypes.bool,
   isFeatured: PropTypes.bool,
+  isPinnedInGroup: PropTypes.bool,
   isMuted: PropTypes.bool,
   isHidden: PropTypes.bool,
   isIntersecting: PropTypes.bool,

app/javascript/gabsocial/components/status_list.js

@@ -67,11 +67,18 @@ class StatusList extends ImmutablePureComponent {
   }
 
   getFeaturedStatusCount = () => {
+    if (!!this.props.groupPinnedStatusIds) {
+      return this.props.groupPinnedStatusIds.size
+    }
+
     return this.props.featuredStatusIds ? this.props.featuredStatusIds.size : 0
   }
 
   getCurrentStatusIndex = (id, featured) => {
     if (featured) {
+      if (!!this.props.groupPinnedStatusIds) {
+        return this.props.groupPinnedStatusIds.indexOf(id)  
+      }
       return this.props.featuredStatusIds.indexOf(id)
     }
 
@@ -129,6 +136,7 @@ class StatusList extends ImmutablePureComponent {
     const {
       statusIds,
       featuredStatusIds,
+      groupPinnedStatusIds,
       onLoadMore,
       timelineId,
       totalQueuedItemsCount,
@@ -225,6 +233,20 @@ class StatusList extends ImmutablePureComponent {
       )).concat(scrollableContent)
     }
 
+    if (scrollableContent && groupPinnedStatusIds) {
+      scrollableContent = groupPinnedStatusIds.map((statusId) => (
+        <StatusContainer
+          key={`f-${statusId}`}
+          id={statusId}
+          isPinnedInGroup
+          onMoveUp={this.handleMoveUp}
+          onMoveDown={this.handleMoveDown}
+          contextType={timelineId}
+          commentsLimited
+        />
+      )).concat(scrollableContent)
+    }
+
     return (
       <React.Fragment>
         <TimelineQueueButtonHeader
@@ -326,6 +348,7 @@ StatusList.propTypes = {
   scrollKey: PropTypes.string.isRequired,
   statusIds: ImmutablePropTypes.list.isRequired,
   featuredStatusIds: ImmutablePropTypes.list,
+  groupPinnedStatusIds: ImmutablePropTypes.list,
   onLoadMore: PropTypes.func,
   isLoading: PropTypes.bool,
   isPartial: PropTypes.bool,

app/javascript/gabsocial/components/status_prepend.js

@@ -16,16 +16,17 @@ class StatusPrepend extends ImmutablePureComponent {
       isFeatured,
       isPromoted,
       isComment,
+      isPinnedInGroup,
     } = this.props
 
     if (!status) return null
 
     const isRepost = (status.get('reblog', null) !== null && typeof status.get('reblog') === 'object')
 
-    if (!isFeatured && !isPromoted && !isRepost && !isComment) return null
+    if (!isFeatured && !isPinnedInGroup && !isPromoted && !isRepost && !isComment) return null
 
     let iconId
-    if (isFeatured) iconId = 'pin'
+    if (isFeatured || isPinnedInGroup) iconId = 'pin'
     else if (isPromoted) iconId = 'star'
     else if (isRepost) iconId = 'repost'
     else if (isComment) iconId = 'comment'
@@ -62,7 +63,7 @@ class StatusPrepend extends ImmutablePureComponent {
           {
             !isRepost && !isComment &&
             <Text color='secondary' size='small'>
-              {intl.formatMessage(isFeatured ? messages.pinned : messages.promoted)}
+              {intl.formatMessage(isFeatured ? messages.pinned : isPinnedInGroup ? messages.pinnedByGroup : messages.promoted)}
             </Text>
           }
           {
@@ -99,6 +100,7 @@ const messages = defineMessages({
   filtered: { id: 'status.filtered', defaultMessage: 'Filtered' },
   promoted: { id: 'status.promoted', defaultMessage: 'Promoted gab' },
   pinned: { id: 'status.pinned', defaultMessage: 'Pinned gab' },
+  pinnedByGroup: { id: 'status.pinned_by_group', defaultMessage: 'Pinned to group' },
   reposted: { id: 'status.reposted_by', defaultMessage: '{name} reposted' },
 })
 
@@ -107,6 +109,7 @@ StatusPrepend.propTypes = {
   status: ImmutablePropTypes.map,
   isComment: PropTypes.bool,
   isFeatured: PropTypes.bool,
+  isPinnedInGroup: PropTypes.bool,
   isPromoted: PropTypes.bool,
 }
 

app/javascript/gabsocial/features/group_timeline.js

@@ -3,6 +3,7 @@ import PropTypes from 'prop-types'
 import { connect } from 'react-redux'
 import ImmutablePureComponent from 'react-immutable-pure-component'
 import ImmutablePropTypes from 'react-immutable-proptypes'
+import { List as ImmutableList } from 'immutable'
 import { injectIntl, defineMessages } from 'react-intl'
 import { me } from '../initial_state'
 import getSortBy from '../utils/group_sort_by'
@@ -10,6 +11,7 @@ import { connectGroupStream } from '../actions/streaming'
 import {
 	clearTimeline,
 	expandGroupTimeline,
+	expandGroupFeaturedTimeline,
 } from '../actions/timelines'
 import {
 	setGroupTimelineSort,
@@ -41,6 +43,8 @@ class GroupTimeline extends ImmutablePureComponent {
 			this.props.setMemberNewest()
 		} else {
 			const sortBy = getSortBy(sortByValue, sortByTopValue, onlyMedia)
+
+			this.props.onExpandGroupFeaturedTimeline(groupId)
 			this.props.onExpandGroupTimeline(groupId, { sortBy, onlyMedia })
 
 			if (!!me) {
@@ -57,6 +61,10 @@ class GroupTimeline extends ImmutablePureComponent {
 			this.handleLoadMore()
 			this.props.onClearTimeline(`group:${this.props.groupId}`)
 		}
+
+		if (prevProps.groupId !== this.props.groupId) {
+			this.props.onExpandGroupFeaturedTimeline(this.props.groupId)
+		}
 	}
 
 	componentWillUnmount() {
@@ -83,6 +91,7 @@ class GroupTimeline extends ImmutablePureComponent {
 			group,
 			groupId,
 			intl,
+			groupPinnedStatusIds,
 		} = this.props
 
 		if (typeof group === 'undefined') {
@@ -98,6 +107,7 @@ class GroupTimeline extends ImmutablePureComponent {
 					scrollKey={`group-timeline-${groupId}`}
 					timelineId={`group:${groupId}`}
 					onLoadMore={this.handleLoadMore}
+					groupPinnedStatusIds={groupPinnedStatusIds}
 					emptyMessage={intl.formatMessage(messages.empty)}
 				/>
 			</React.Fragment>
@@ -110,9 +120,12 @@ const messages = defineMessages({
 	empty: { id: 'empty_column.group', defaultMessage: 'There is nothing in this group yet.\nWhen members of this group post new statuses, they will appear here.' },
 })
 
+const emptyList = ImmutableList()
+
 const mapStateToProps = (state, props) => ({
 	groupId: props.params.id,
 	group: state.getIn(['groups', props.params.id]),
+	groupPinnedStatusIds: state.getIn(['timelines', `group:${props.params.id}:pinned`, 'items'], emptyList),
 	sortByValue: state.getIn(['group_lists', 'sortByValue']),
 	sortByTopValue: state.getIn(['group_lists', 'sortByTopValue']),
 })
@@ -130,6 +143,9 @@ const mapDispatchToProps = (dispatch) => ({
 	setMemberNewest() {
 		dispatch(setGroupTimelineSort(GROUP_TIMELINE_SORTING_TYPE_NEWEST))
 	},
+	onExpandGroupFeaturedTimeline(groupId) {
+		dispatch(expandGroupFeaturedTimeline(groupId))
+	},
 })
 
 GroupTimeline.propTypes = {
@@ -143,6 +159,7 @@ GroupTimeline.propTypes = {
 	onConnectGroupStream: PropTypes.func.isRequired,
 	onClearTimeline: PropTypes.func.isRequired,
 	onExpandGroupTimeline: PropTypes.func.isRequired,
+	onExpandGroupFeaturedTimeline: PropTypes.func.isRequired,
 	setMemberNewest: PropTypes.func.isRequired,
 	sortByValue: PropTypes.string.isRequired,
 	sortByTopValue: PropTypes.string,

app/models/concerns/group_interactions.rb

@@ -17,6 +17,10 @@ module GroupInteractions
       follow_mapping(GroupAccount.where(group_id: target_group_ids, account_id: account_id, role: :moderator), :group_id)
     end
 
+    def pinned?(status)
+      group_pinned_statuses.where(group_id: status.group_id, status: status).exists?
+    end
+
     private
 
     def follow_mapping(query, field)

app/models/group.rb

@@ -36,6 +36,9 @@ class Group < ApplicationRecord
   has_many :group_accounts, inverse_of: :group, dependent: :destroy
   has_many :accounts, through: :group_accounts
 
+  has_many :group_pinned_statuses, inverse_of: :group, dependent: :destroy
+  has_many :pinned_statuses, source: :status, through: :group_pinned_statuses
+
   has_many :group_removed_accounts, inverse_of: :group, dependent: :destroy
   has_many :removed_accounts, source: :account, through: :group_removed_accounts
 

app/models/group_pinned_status.rb

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+# == Schema Information
+#
+# Table name: group_pinned_statuses
+#
+#  id        :bigint(8)        not null, primary key
+#  status_id :bigint(8)        not null
+#  group_id  :bigint(8)        not null
+#
+
+class GroupPinnedStatus < ApplicationRecord
+  belongs_to :group
+  belongs_to :status
+
+  validates_with GroupPinnedStatusValidator
+end

app/models/status.rb

@@ -389,6 +389,12 @@ class Status < ApplicationRecord
       StatusPin.select('status_id').where(status_id: status_ids).where(account_id: account_id).each_with_object({}) { |p, h| h[p.status_id] = true }
     end
 
+    def group_pins_map(status_ids, group_id = nil)
+      unless group_id.nil?
+        GroupPinnedStatus.select('status_id').where(status_id: status_ids).where(group_id: group_id).each_with_object({}) { |p, h| h[p.status_id] = true }
+      end
+    end
+
     def reload_stale_associations!(cached_items)
       account_ids = []
 

app/presenters/status_relationships_presenter.rb

@@ -1,8 +1,7 @@
 # frozen_string_literal: true
 
 class StatusRelationshipsPresenter
-  attr_reader :reblogs_map, :favourites_map, :mutes_map, :pins_map, :bookmarks_map
-
+  attr_reader :reblogs_map, :favourites_map, :mutes_map, :pins_map, :group_pins_map, :bookmarks_map
 
   def initialize(statuses, current_account_id = nil, **options)
     if current_account_id.nil?
@@ -11,6 +10,7 @@ class StatusRelationshipsPresenter
       @mutes_map      = {}
       @bookmarks_map  = {}
       @pins_map       = {}
+      @group_pins_map = {}
     else
       statuses            = statuses.compact
       status_ids          = statuses.flat_map { |s| [s.id, s.reblog_of_id, s.quote_of_id] }.uniq.compact
@@ -22,6 +22,11 @@ class StatusRelationshipsPresenter
       @mutes_map       = Status.mutes_map(conversation_ids, current_account_id).merge(options[:mutes_map] || {})
       @bookmarks_map   = Status.bookmarks_map(status_ids, current_account_id).merge(options[:bookmarks_map] || {})
       @pins_map        = Status.pins_map(pinnable_status_ids, current_account_id).merge(options[:pins_map] || {})
+      if options[:group_id]
+        @group_pins_map = Status.group_pins_map(status_ids, options[:group_id]).merge(options[:group_pins_map] || {})
+      else
+        @group_pins_map = {}
+      end
     end
   end
 end

app/serializers/rest/status_serializer.rb

@@ -11,6 +11,7 @@ class REST::StatusSerializer < ActiveModel::Serializer
   attribute :muted, if: :current_user?
   attribute :bookmarked, if: :current_user?
   attribute :pinned, if: :pinnable?
+  attribute :pinned_by_group, if: :pinnable_by_group?
 
   attribute :content, unless: :source_requested?
   attribute :rich_content, unless: :source_requested?
@@ -141,6 +142,22 @@ class REST::StatusSerializer < ActiveModel::Serializer
       %w(public unlisted).include?(object.visibility)
   end
 
+  def pinned_by_group
+    if instance_options && instance_options[:relationships]
+      instance_options[:relationships].group_pins_map[object.id] || false
+    else
+      false
+    end
+  end
+
+  def pinnable_by_group?
+    if object.group_id?
+      true
+    else
+      false
+    end
+  end
+
   def source_requested?
     instance_options[:source_requested]
   end

app/validators/group_pinned_status_validator.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+class GroupPinnedStatusValidator < ActiveModel::Validator
+  def validate(groupPin)
+    groupPin.errors.add(:base, I18n.t('statuses.group_pin_errors.reblog')) if groupPin.status.reblog?
+    groupPin.errors.add(:base, I18n.t('statuses.pin_errors.ungrouped')) unless groupPin.status.group_id
+    groupPin.errors.add(:base, I18n.t('statuses.pin_errors.notGroupStatus')) if groupPin.status.group_id != groupPin.group.id
+    groupPin.errors.add(:base, I18n.t('statuses.group_pin_errors.limit')) if groupPin.group.group_pinned_statuses.count >= 4
+  end
+end

config/locales/en.yml

@@ -933,6 +933,11 @@ en:
       ownership: Someone else's gab cannot be pinned
       private: Non-public gabs can't be pinned
       reblog: A repost cannot be pinned
+    group_pin_errors:
+      limit: You have already pinned the maximum number of gabs for groups
+      ungrouped: Gabs not made in the group cannot be pinned
+      reblog: A repost cannot be pinned
+      notGroupStatus: The status you are attempting to pin is not associated with the given group
     poll:
       total_votes:
         one: "%{count} vote"

config/locales/en_GB.yml

@@ -873,6 +873,11 @@ en_GB:
       ownership: Someone else's toot cannot be pinned
       private: Non-public toot cannot be pinned
       reblog: A repost cannot be pinned
+    group_pin_errors:
+      limit: You have already pinned the maximum number of gabs for groups
+      ungrouped: Gabs not made in the group cannot be pinned
+      reblog: A repost cannot be pinned
+      notGroupStatus: The status you are attempting to pin is not associated with the given group
     poll:
       total_votes:
         one: "%{count} vote"

config/routes.rb

@@ -330,6 +330,7 @@ Rails.application.routes.draw do
         resources :list, only: :show
         resources :group, only: :show
         resources :group_collection, only: :show
+        resources :group_pins, only: :show
       end
 
       resources :gab_trends, only: [:index]
@@ -439,6 +440,8 @@ Rails.application.routes.draw do
         resources :relationships, only: :index, controller: 'groups/relationships'
         resource :accounts, only: [:show, :create, :update, :destroy], controller: 'groups/accounts'
         resource :removed_accounts, only: [:show, :create, :destroy], controller: 'groups/removed_accounts'
+        resource :pin, only: :create, controller: 'groups/pins'
+        post :unpin, to: 'groups/pins#destroy'
       end
 
       resources :polls, only: [:create, :show] do