diff --git a/app/controllers/sent_notifications_controller.rb b/app/controllers/sent_notifications_controller.rb
index 3085ff33aba..04c36b3ebfe 100644
--- a/app/controllers/sent_notifications_controller.rb
+++ b/app/controllers/sent_notifications_controller.rb
@@ -12,7 +12,7 @@ class SentNotificationsController < ApplicationController
 
   def unsubscribe_and_redirect
     noteable = @sent_notification.noteable
-    noteable.unsubscribe(@sent_notification.recipient)
+    noteable.unsubscribe(@sent_notification.recipient, @sent_notification.project)
 
     flash[:notice] = "You have been unsubscribed from this thread."
 
diff --git a/app/models/concerns/subscribable.rb b/app/models/concerns/subscribable.rb
index 2210a210f33..5f2725a6d7f 100644
--- a/app/models/concerns/subscribable.rb
+++ b/app/models/concerns/subscribable.rb
@@ -12,45 +12,43 @@ module Subscribable
     has_many :subscriptions, dependent: :destroy, as: :subscribable
   end
 
-  def subscribed?(user, to_project = nil)
-    if subscription = subscriptions.find_by(user: user, project: (to_project || project))
+  def subscribed?(user, project)
+    if subscription = subscriptions.find_by(user: user, project: project)
       subscription.subscribed
     else
-      subscribed_without_subscriptions?(user, to_project)
+      subscribed_without_subscriptions?(user, project)
     end
   end
 
   # Override this method to define custom logic to consider a subscribable as
   # subscribed without an explicit subscription record.
-  def subscribed_without_subscriptions?(user, to_project = nil)
+  def subscribed_without_subscriptions?(user, project)
     false
   end
 
-  def subscribers(to_project = nil)
-    subscriptions.where(project: (to_project || project), subscribed: true).map(&:user)
+  def subscribers(project)
+    subscriptions.where(project: project, subscribed: true).map(&:user)
   end
 
-  def toggle_subscription(user, to_project = nil)
-    subscribed = subscribed?(user, (to_project || project))
-
-    find_or_initialize_subscription(user, to_project).
-      update(subscribed: !subscribed)
+  def toggle_subscription(user, project)
+    find_or_initialize_subscription(user, project).
+      update(subscribed: !subscribed?(user, project))
   end
 
-  def subscribe(user, to_project = nil)
-    find_or_initialize_subscription(user, to_project).
+  def subscribe(user, project)
+    find_or_initialize_subscription(user, project).
       update(subscribed: true)
   end
 
-  def unsubscribe(user, to_project = nil)
-    find_or_initialize_subscription(user, to_project).
+  def unsubscribe(user, project)
+    find_or_initialize_subscription(user, project).
       update(subscribed: false)
   end
 
   private
 
-  def find_or_initialize_subscription(user, to_project = nil)
+  def find_or_initialize_subscription(user, project)
     subscriptions.
-      find_or_initialize_by(user_id: user.id, project_id: (to_project || project).id)
+      find_or_initialize_by(user_id: user.id, project_id: project.id)
   end
 end
diff --git a/app/models/issue.rb b/app/models/issue.rb
index 4a4017003d8..6e8f5d3c422 100644
--- a/app/models/issue.rb
+++ b/app/models/issue.rb
@@ -266,7 +266,7 @@ class Issue < ActiveRecord::Base
 
   def as_json(options = {})
     super(options).tap do |json|
-      json[:subscribed] = subscribed?(options[:user]) if options.has_key?(:user) && options[:user]
+      json[:subscribed] = subscribed?(options[:user], project) if options.has_key?(:user) && options[:user]
 
       if options.has_key?(:labels)
         json[:labels] = labels.as_json(
diff --git a/app/services/issuable_base_service.rb b/app/services/issuable_base_service.rb
index bb92cd80cc9..575795788de 100644
--- a/app/services/issuable_base_service.rb
+++ b/app/services/issuable_base_service.rb
@@ -212,9 +212,9 @@ class IssuableBaseService < BaseService
   def change_subscription(issuable)
     case params.delete(:subscription_event)
     when 'subscribe'
-      issuable.subscribe(current_user)
+      issuable.subscribe(current_user, project)
     when 'unsubscribe'
-      issuable.unsubscribe(current_user)
+      issuable.unsubscribe(current_user, project)
     end
   end
 
diff --git a/app/services/slash_commands/interpret_service.rb b/app/services/slash_commands/interpret_service.rb
index 5a81194a5f4..d75c5b1800e 100644
--- a/app/services/slash_commands/interpret_service.rb
+++ b/app/services/slash_commands/interpret_service.rb
@@ -193,7 +193,7 @@ module SlashCommands
     desc 'Subscribe'
     condition do
       issuable.persisted? &&
-        !issuable.subscribed?(current_user)
+        !issuable.subscribed?(current_user, project)
     end
     command :subscribe do
       @updates[:subscription_event] = 'subscribe'
@@ -202,7 +202,7 @@ module SlashCommands
     desc 'Unsubscribe'
     condition do
       issuable.persisted? &&
-        issuable.subscribed?(current_user)
+        issuable.subscribed?(current_user, project)
     end
     command :unsubscribe do
       @updates[:subscription_event] = 'unsubscribe'
diff --git a/app/views/shared/issuable/_sidebar.html.haml b/app/views/shared/issuable/_sidebar.html.haml
index 7363ead09ff..f166fac105d 100644
--- a/app/views/shared/issuable/_sidebar.html.haml
+++ b/app/views/shared/issuable/_sidebar.html.haml
@@ -140,7 +140,7 @@
 
       = render "shared/issuable/participants", participants: issuable.participants(current_user)
       - if current_user
-        - subscribed = issuable.subscribed?(current_user)
+        - subscribed = issuable.subscribed?(current_user, @project)
         .block.light.subscription{data: {url: toggle_subscription_path(issuable)}}
           .sidebar-collapsed-icon
             = icon('rss')
diff --git a/lib/api/entities.rb b/lib/api/entities.rb
index e7042677635..33cb6fd3704 100644
--- a/lib/api/entities.rb
+++ b/lib/api/entities.rb
@@ -218,7 +218,7 @@ module API
       expose :assignee, :author, using: Entities::UserBasic
 
       expose :subscribed do |issue, options|
-        issue.subscribed?(options[:current_user])
+        issue.subscribed?(options[:current_user], options[:project] || issue.project)
       end
       expose :user_notes_count
       expose :upvotes, :downvotes
@@ -248,7 +248,7 @@ module API
       expose :diff_head_sha, as: :sha
       expose :merge_commit_sha
       expose :subscribed do |merge_request, options|
-        merge_request.subscribed?(options[:current_user])
+        merge_request.subscribed?(options[:current_user], options[:project])
       end
       expose :user_notes_count
       expose :should_remove_source_branch?, as: :should_remove_source_branch
diff --git a/lib/api/issues.rb b/lib/api/issues.rb
index c9689e6f8ef..eea5b91d4f9 100644
--- a/lib/api/issues.rb
+++ b/lib/api/issues.rb
@@ -120,7 +120,7 @@ module API
 
         issues = issues.reorder(issuable_order_by => issuable_sort)
 
-        present paginate(issues), with: Entities::Issue, current_user: current_user
+        present paginate(issues), with: Entities::Issue, current_user: current_user, project: user_project
       end
 
       # Get a single project issue
@@ -132,7 +132,7 @@ module API
       #   GET /projects/:id/issues/:issue_id
       get ":id/issues/:issue_id" do
         @issue = find_project_issue(params[:issue_id])
-        present @issue, with: Entities::Issue, current_user: current_user
+        present @issue, with: Entities::Issue, current_user: current_user, project: user_project
       end
 
       # Create a new project issue
@@ -174,7 +174,7 @@ module API
         end
 
         if issue.valid?
-          present issue, with: Entities::Issue, current_user: current_user
+          present issue, with: Entities::Issue, current_user: current_user, project: user_project
         else
           render_validation_error!(issue)
         end
@@ -217,7 +217,7 @@ module API
         issue = ::Issues::UpdateService.new(user_project, current_user, attrs).execute(issue)
 
         if issue.valid?
-          present issue, with: Entities::Issue, current_user: current_user
+          present issue, with: Entities::Issue, current_user: current_user, project: user_project
         else
           render_validation_error!(issue)
         end
@@ -239,7 +239,7 @@ module API
 
         begin
           issue = ::Issues::MoveService.new(user_project, current_user).execute(issue, new_project)
-          present issue, with: Entities::Issue, current_user: current_user
+          present issue, with: Entities::Issue, current_user: current_user, project: user_project
         rescue ::Issues::MoveService::MoveError => error
           render_api_error!(error.message, 400)
         end
diff --git a/lib/api/merge_requests.rb b/lib/api/merge_requests.rb
index f9720786e63..4176c7eec06 100644
--- a/lib/api/merge_requests.rb
+++ b/lib/api/merge_requests.rb
@@ -60,7 +60,7 @@ module API
           end
 
         merge_requests = merge_requests.reorder(issuable_order_by => issuable_sort)
-        present paginate(merge_requests), with: Entities::MergeRequest, current_user: current_user
+        present paginate(merge_requests), with: Entities::MergeRequest, current_user: current_user, project: user_project
       end
 
       desc 'Create a merge request' do
@@ -87,7 +87,7 @@ module API
         merge_request = ::MergeRequests::CreateService.new(user_project, current_user, mr_params).execute
 
         if merge_request.valid?
-          present merge_request, with: Entities::MergeRequest, current_user: current_user
+          present merge_request, with: Entities::MergeRequest, current_user: current_user, project: user_project
         else
           handle_merge_request_errors! merge_request.errors
         end
@@ -120,7 +120,7 @@ module API
         get path do
           merge_request = user_project.merge_requests.find(params[:merge_request_id])
           authorize! :read_merge_request, merge_request
-          present merge_request, with: Entities::MergeRequest, current_user: current_user
+          present merge_request, with: Entities::MergeRequest, current_user: current_user, project: user_project
         end
 
         desc 'Get the commits of a merge request' do
@@ -167,7 +167,7 @@ module API
           merge_request = ::MergeRequests::UpdateService.new(user_project, current_user, mr_params).execute(merge_request)
 
           if merge_request.valid?
-            present merge_request, with: Entities::MergeRequest, current_user: current_user
+            present merge_request, with: Entities::MergeRequest, current_user: current_user, project: user_project
           else
             handle_merge_request_errors! merge_request.errors
           end
@@ -212,7 +212,7 @@ module API
               execute(merge_request)
           end
 
-          present merge_request, with: Entities::MergeRequest, current_user: current_user
+          present merge_request, with: Entities::MergeRequest, current_user: current_user, project: user_project
         end
 
         desc 'Cancel merge if "Merge when build succeeds" is enabled' do
diff --git a/lib/api/milestones.rb b/lib/api/milestones.rb
index ba4a84275bc..937c118779d 100644
--- a/lib/api/milestones.rb
+++ b/lib/api/milestones.rb
@@ -114,7 +114,7 @@ module API
         }
 
         issues = IssuesFinder.new(current_user, finder_params).execute
-        present paginate(issues), with: Entities::Issue, current_user: current_user
+        present paginate(issues), with: Entities::Issue, current_user: current_user, project: user_project
       end
     end
   end
diff --git a/spec/controllers/projects/boards/issues_controller_spec.rb b/spec/controllers/projects/boards/issues_controller_spec.rb
index cbe0417a4a7..299d2c981d3 100644
--- a/spec/controllers/projects/boards/issues_controller_spec.rb
+++ b/spec/controllers/projects/boards/issues_controller_spec.rb
@@ -25,7 +25,7 @@ describe Projects::Boards::IssuesController do
         create(:labeled_issue, project: project, labels: [planning])
         create(:labeled_issue, project: project, labels: [development], due_date: Date.tomorrow)
         create(:labeled_issue, project: project, labels: [development], assignee: johndoe)
-        issue.subscribe(johndoe)
+        issue.subscribe(johndoe, project)
 
         list_issues user: user, board: board, list: list2
 
diff --git a/spec/controllers/sent_notifications_controller_spec.rb b/spec/controllers/sent_notifications_controller_spec.rb
index 5ddfe84440e..954fc2eaf21 100644
--- a/spec/controllers/sent_notifications_controller_spec.rb
+++ b/spec/controllers/sent_notifications_controller_spec.rb
@@ -3,7 +3,7 @@ require 'rails_helper'
 describe SentNotificationsController, type: :controller do
   let(:user) { create(:user) }
   let(:project) { create(:empty_project) }
-  let(:sent_notification) { create(:sent_notification, noteable: issue, recipient: user) }
+  let(:sent_notification) { create(:sent_notification, project: project, noteable: issue, recipient: user) }
 
   let(:issue) do
     create(:issue, project: project, author: user) do |issue|
@@ -17,7 +17,7 @@ describe SentNotificationsController, type: :controller do
         before { get(:unsubscribe, id: sent_notification.reply_key, force: true) }
 
         it 'unsubscribes the user' do
-          expect(issue.subscribed?(user)).to be_falsey
+          expect(issue.subscribed?(user, project)).to be_falsey
         end
 
         it 'sets the flash message' do
@@ -33,7 +33,7 @@ describe SentNotificationsController, type: :controller do
         before { get(:unsubscribe, id: sent_notification.reply_key) }
 
         it 'does not unsubscribe the user' do
-          expect(issue.subscribed?(user)).to be_truthy
+          expect(issue.subscribed?(user, project)).to be_truthy
         end
 
         it 'does not set the flash message' do
@@ -53,7 +53,7 @@ describe SentNotificationsController, type: :controller do
         before { get(:unsubscribe, id: sent_notification.reply_key.reverse) }
 
         it 'does not unsubscribe the user' do
-          expect(issue.subscribed?(user)).to be_truthy
+          expect(issue.subscribed?(user, project)).to be_truthy
         end
 
         it 'does not set the flash message' do
@@ -69,7 +69,7 @@ describe SentNotificationsController, type: :controller do
         before { get(:unsubscribe, id: sent_notification.reply_key, force: true) }
 
         it 'unsubscribes the user' do
-          expect(issue.subscribed?(user)).to be_falsey
+          expect(issue.subscribed?(user, project)).to be_falsey
         end
 
         it 'sets the flash message' do
@@ -88,11 +88,11 @@ describe SentNotificationsController, type: :controller do
             merge_request.subscriptions.create(user: user, project: project, subscribed: true)
           end
         end
-        let(:sent_notification) { create(:sent_notification, noteable: merge_request, recipient: user) }
+        let(:sent_notification) { create(:sent_notification, project: project, noteable: merge_request, recipient: user) }
         before { get(:unsubscribe, id: sent_notification.reply_key) }
 
         it 'unsubscribes the user' do
-          expect(merge_request.subscribed?(user)).to be_falsey
+          expect(merge_request.subscribed?(user, project)).to be_falsey
         end
 
         it 'sets the flash message' do
diff --git a/spec/features/unsubscribe_links_spec.rb b/spec/features/unsubscribe_links_spec.rb
index 33b52d1547e..e2d9cfdd0b0 100644
--- a/spec/features/unsubscribe_links_spec.rb
+++ b/spec/features/unsubscribe_links_spec.rb
@@ -26,11 +26,11 @@ describe 'Unsubscribe links', feature: true do
         expect(current_path).to eq unsubscribe_sent_notification_path(SentNotification.last)
         expect(page).to have_text(%(Unsubscribe from issue #{issue.title} (#{issue.to_reference})))
         expect(page).to have_text(%(Are you sure you want to unsubscribe from issue #{issue.title} (#{issue.to_reference})?))
-        expect(issue.subscribed?(recipient)).to be_truthy
+        expect(issue.subscribed?(recipient, project)).to be_truthy
 
         click_link 'Unsubscribe'
 
-        expect(issue.subscribed?(recipient)).to be_falsey
+        expect(issue.subscribed?(recipient, project)).to be_falsey
         expect(current_path).to eq new_user_session_path
       end
 
@@ -38,11 +38,11 @@ describe 'Unsubscribe links', feature: true do
         visit body_link
 
         expect(current_path).to eq unsubscribe_sent_notification_path(SentNotification.last)
-        expect(issue.subscribed?(recipient)).to be_truthy
+        expect(issue.subscribed?(recipient, project)).to be_truthy
 
         click_link 'Cancel'
 
-        expect(issue.subscribed?(recipient)).to be_truthy
+        expect(issue.subscribed?(recipient, project)).to be_truthy
         expect(current_path).to eq new_user_session_path
       end
     end
@@ -51,7 +51,7 @@ describe 'Unsubscribe links', feature: true do
       visit header_link
 
       expect(page).to have_text('unsubscribed')
-      expect(issue.subscribed?(recipient)).to be_falsey
+      expect(issue.subscribed?(recipient, project)).to be_falsey
     end
   end
 
@@ -62,14 +62,14 @@ describe 'Unsubscribe links', feature: true do
       visit body_link
 
       expect(page).to have_text('unsubscribed')
-      expect(issue.subscribed?(recipient)).to be_falsey
+      expect(issue.subscribed?(recipient, project)).to be_falsey
     end
 
     it 'unsubscribes from the issue when visiting the link from the header' do
       visit header_link
 
       expect(page).to have_text('unsubscribed')
-      expect(issue.subscribed?(recipient)).to be_falsey
+      expect(issue.subscribed?(recipient, project)).to be_falsey
     end
   end
 end
diff --git a/spec/models/concerns/issuable_spec.rb b/spec/models/concerns/issuable_spec.rb
index e8fead767f2..6f84bffe046 100644
--- a/spec/models/concerns/issuable_spec.rb
+++ b/spec/models/concerns/issuable_spec.rb
@@ -182,19 +182,19 @@ describe Issue, "Issuable" do
       before { allow(issue).to receive(:participants).with(user).and_return([]) }
 
       it 'returns false when no subcription exists' do
-        expect(issue.subscribed?(user)).to be_falsey
+        expect(issue.subscribed?(user, project)).to be_falsey
       end
 
       it 'returns true when a subcription exists and subscribed is true' do
         issue.subscriptions.create(user: user, project: project, subscribed: true)
 
-        expect(issue.subscribed?(user)).to be_truthy
+        expect(issue.subscribed?(user, project)).to be_truthy
       end
 
       it 'returns false when a subcription exists and subscribed is false' do
         issue.subscriptions.create(user: user, project: project, subscribed: false)
 
-        expect(issue.subscribed?(user)).to be_falsey
+        expect(issue.subscribed?(user, project)).to be_falsey
       end
     end
 
@@ -202,19 +202,19 @@ describe Issue, "Issuable" do
       before { allow(issue).to receive(:participants).with(user).and_return([user]) }
 
       it 'returns false when no subcription exists' do
-        expect(issue.subscribed?(user)).to be_truthy
+        expect(issue.subscribed?(user, project)).to be_truthy
       end
 
       it 'returns true when a subcription exists and subscribed is true' do
         issue.subscriptions.create(user: user, project: project, subscribed: true)
 
-        expect(issue.subscribed?(user)).to be_truthy
+        expect(issue.subscribed?(user, project)).to be_truthy
       end
 
       it 'returns false when a subcription exists and subscribed is false' do
         issue.subscriptions.create(user: user, project: project, subscribed: false)
 
-        expect(issue.subscribed?(user)).to be_falsey
+        expect(issue.subscribed?(user, project)).to be_falsey
       end
     end
   end
diff --git a/spec/requests/api/issues_spec.rb b/spec/requests/api/issues_spec.rb
index beed53d1e5c..7bae055b241 100644
--- a/spec/requests/api/issues_spec.rb
+++ b/spec/requests/api/issues_spec.rb
@@ -637,7 +637,7 @@ describe API::API, api: true  do
 
     it "sends notifications for subscribers of newly added labels" do
       label = project.labels.first
-      label.toggle_subscription(user2)
+      label.toggle_subscription(user2, project)
 
       perform_enqueued_jobs do
         post api("/projects/#{project.id}/issues", user),
@@ -828,7 +828,7 @@ describe API::API, api: true  do
 
     it "sends notifications for subscribers of newly added labels when issue is updated" do
       label = create(:label, title: 'foo', color: '#FFAABB', project: project)
-      label.toggle_subscription(user2)
+      label.toggle_subscription(user2, project)
 
       perform_enqueued_jobs do
         put api("/projects/#{project.id}/issues/#{issue.id}", user),
diff --git a/spec/requests/api/labels_spec.rb b/spec/requests/api/labels_spec.rb
index 77dfebf1a98..aaf41639277 100644
--- a/spec/requests/api/labels_spec.rb
+++ b/spec/requests/api/labels_spec.rb
@@ -339,7 +339,7 @@ describe API::API, api: true  do
     end
 
     context "when user is already subscribed to label" do
-      before { label1.subscribe(user) }
+      before { label1.subscribe(user, project) }
 
       it "returns 304" do
         post api("/projects/#{project.id}/labels/#{label1.id}/subscription", user)
@@ -358,7 +358,7 @@ describe API::API, api: true  do
   end
 
   describe "DELETE /projects/:id/labels/:label_id/subscription" do
-    before { label1.subscribe(user) }
+    before { label1.subscribe(user, project) }
 
     context "when label_id is a label title" do
       it "unsubscribes from the label" do
@@ -381,7 +381,7 @@ describe API::API, api: true  do
     end
 
     context "when user is already unsubscribed from label" do
-      before { label1.unsubscribe(user) }
+      before { label1.unsubscribe(user, project) }
 
       it "returns 304" do
         delete api("/projects/#{project.id}/labels/#{label1.id}/subscription", user)
diff --git a/spec/services/issuable/bulk_update_service_spec.rb b/spec/services/issuable/bulk_update_service_spec.rb
index f4a53f7e4c6..5f3020b6525 100644
--- a/spec/services/issuable/bulk_update_service_spec.rb
+++ b/spec/services/issuable/bulk_update_service_spec.rb
@@ -260,7 +260,7 @@ describe Issuable::BulkUpdateService, services: true do
     it 'subscribes the given user' do
       bulk_update(issues, subscription_event: 'subscribe')
 
-      expect(issues).to all(be_subscribed(user))
+      expect(issues).to all(be_subscribed(user, project))
     end
   end
 
@@ -275,7 +275,7 @@ describe Issuable::BulkUpdateService, services: true do
       bulk_update(issues, subscription_event: 'unsubscribe')
 
       issues.each do |issue|
-        expect(issue).not_to be_subscribed(user)
+        expect(issue).not_to be_subscribed(user, project)
       end
     end
   end
diff --git a/spec/services/issues/update_service_spec.rb b/spec/services/issues/update_service_spec.rb
index 1638a46ed51..4777a90639e 100644
--- a/spec/services/issues/update_service_spec.rb
+++ b/spec/services/issues/update_service_spec.rb
@@ -215,7 +215,7 @@ describe Issues::UpdateService, services: true do
 
       let!(:subscriber) do
         create(:user).tap do |u|
-          label.toggle_subscription(u)
+          label.toggle_subscription(u, project)
           project.team << [u, :developer]
         end
       end
diff --git a/spec/services/merge_requests/update_service_spec.rb b/spec/services/merge_requests/update_service_spec.rb
index 2433a7dad06..cb5d7cdb467 100644
--- a/spec/services/merge_requests/update_service_spec.rb
+++ b/spec/services/merge_requests/update_service_spec.rb
@@ -199,7 +199,7 @@ describe MergeRequests::UpdateService, services: true do
 
     context 'when the issue is relabeled' do
       let!(:non_subscriber) { create(:user) }
-      let!(:subscriber) { create(:user).tap { |u| label.toggle_subscription(u) } }
+      let!(:subscriber) { create(:user) { |u| label.toggle_subscription(u, project) } }
 
       before do
         project.team << [non_subscriber, :developer]
diff --git a/spec/services/notification_service_spec.rb b/spec/services/notification_service_spec.rb
index 3a5bd4a4084..64e378d8328 100644
--- a/spec/services/notification_service_spec.rb
+++ b/spec/services/notification_service_spec.rb
@@ -385,7 +385,7 @@ describe NotificationService, services: true do
         label = create(:label, project: project, issues: [issue])
         group_label = create(:group_label, group: group, issues: [issue])
         issue.reload
-        label.toggle_subscription(user_1)
+        label.toggle_subscription(user_1, project)
         group_label.toggle_subscription(user_2, project)
         group_label.toggle_subscription(user_3, another_project)
 
@@ -411,12 +411,12 @@ describe NotificationService, services: true do
 
           label = create(:label, project: project, issues: [confidential_issue])
           confidential_issue.reload
-          label.toggle_subscription(non_member)
-          label.toggle_subscription(author)
-          label.toggle_subscription(assignee)
-          label.toggle_subscription(member)
-          label.toggle_subscription(guest)
-          label.toggle_subscription(admin)
+          label.toggle_subscription(non_member, project)
+          label.toggle_subscription(author, project)
+          label.toggle_subscription(assignee, project)
+          label.toggle_subscription(member, project)
+          label.toggle_subscription(guest, project)
+          label.toggle_subscription(admin, project)
 
           reset_delivered_emails!
 
@@ -568,11 +568,11 @@ describe NotificationService, services: true do
       let(:group_label_2) { create(:group_label, group: group, title: 'Group Label 2') }
       let(:label_1) { create(:label, project: project, title: 'Label 1', issues: [issue]) }
       let(:label_2) { create(:label, project: project, title: 'Label 2') }
-      let!(:subscriber_to_group_label_1) { create(:user).tap { |u| group_label_1.toggle_subscription(u, project) } }
-      let!(:subscriber_to_group_label_2) { create(:user).tap { |u| group_label_2.toggle_subscription(u, project) } }
-      let!(:subscriber_to_group_label_2_on_another_project) { create(:user).tap { |u| group_label_2.toggle_subscription(u, another_project) } }
-      let!(:subscriber_to_label_1) { create(:user).tap { |u| label_1.toggle_subscription(u) } }
-      let!(:subscriber_to_label_2) { create(:user).tap { |u| label_2.toggle_subscription(u) } }
+      let!(:subscriber_to_group_label_1) { create(:user) { |u| group_label_1.toggle_subscription(u, project) } }
+      let!(:subscriber_to_group_label_2) { create(:user) { |u| group_label_2.toggle_subscription(u, project) } }
+      let!(:subscriber_to_group_label_2_on_another_project) { create(:user) { |u| group_label_2.toggle_subscription(u, another_project) } }
+      let!(:subscriber_to_label_1) { create(:user) { |u| label_1.toggle_subscription(u, project) } }
+      let!(:subscriber_to_label_2) { create(:user) { |u| label_2.toggle_subscription(u, project) } }
 
       it "emails subscribers of the issue's added labels only" do
         notification.relabeled_issue(issue, [group_label_2, label_2], @u_disabled)
@@ -618,12 +618,12 @@ describe NotificationService, services: true do
           project.team << [member, :developer]
           project.team << [guest, :guest]
 
-          label_2.toggle_subscription(non_member)
-          label_2.toggle_subscription(author)
-          label_2.toggle_subscription(assignee)
-          label_2.toggle_subscription(member)
-          label_2.toggle_subscription(guest)
-          label_2.toggle_subscription(admin)
+          label_2.toggle_subscription(non_member, project)
+          label_2.toggle_subscription(author, project)
+          label_2.toggle_subscription(assignee, project)
+          label_2.toggle_subscription(member, project)
+          label_2.toggle_subscription(guest, project)
+          label_2.toggle_subscription(admin, project)
 
           reset_delivered_emails!
 
@@ -786,7 +786,7 @@ describe NotificationService, services: true do
         user_3 = create(:user)
         label = create(:label, project: project, merge_requests: [merge_request])
         group_label = create(:group_label, group: group, merge_requests: [merge_request])
-        label.toggle_subscription(user_1)
+        label.toggle_subscription(user_1, project)
         group_label.toggle_subscription(user_2, project)
         group_label.toggle_subscription(user_3, another_project)
 
@@ -892,11 +892,11 @@ describe NotificationService, services: true do
       let(:group_label_2) { create(:group_label, group: group, title: 'Group Label 2') }
       let(:label_1) { create(:label, project: project, title: 'Label 1', merge_requests: [merge_request]) }
       let(:label_2) { create(:label, project: project, title: 'Label 2') }
-      let!(:subscriber_to_group_label_1) { create(:user).tap { |u| group_label_1.toggle_subscription(u, project) } }
-      let!(:subscriber_to_group_label_2) { create(:user).tap { |u| group_label_2.toggle_subscription(u, project) } }
-      let!(:subscriber_to_group_label_2_on_another_project) { create(:user).tap { |u| group_label_2.toggle_subscription(u, another_project) } }
-      let!(:subscriber_to_label_1) { create(:user).tap { |u| label_1.toggle_subscription(u) } }
-      let!(:subscriber_to_label_2) { create(:user).tap { |u| label_2.toggle_subscription(u) } }
+      let!(:subscriber_to_group_label_1) { create(:user) { |u| group_label_1.toggle_subscription(u, project) } }
+      let!(:subscriber_to_group_label_2) { create(:user) { |u| group_label_2.toggle_subscription(u, project) } }
+      let!(:subscriber_to_group_label_2_on_another_project) { create(:user) { |u| group_label_2.toggle_subscription(u, another_project) } }
+      let!(:subscriber_to_label_1) { create(:user) { |u| label_1.toggle_subscription(u, project) } }
+      let!(:subscriber_to_label_2) { create(:user) { |u| label_2.toggle_subscription(u, project) } }
 
       it "emails subscribers of the merge request's added labels only" do
         notification.relabeled_merge_request(merge_request, [group_label_2, label_2], @u_disabled)
diff --git a/spec/services/slash_commands/interpret_service_spec.rb b/spec/services/slash_commands/interpret_service_spec.rb
index b57e338b782..becf627a4f5 100644
--- a/spec/services/slash_commands/interpret_service_spec.rb
+++ b/spec/services/slash_commands/interpret_service_spec.rb
@@ -169,7 +169,7 @@ describe SlashCommands::InterpretService, services: true do
 
     shared_examples 'unsubscribe command' do
       it 'populates subscription_event: "unsubscribe" if content contains /unsubscribe' do
-        issuable.subscribe(developer)
+        issuable.subscribe(developer, project)
         _, updates = service.execute(content, issuable)
 
         expect(updates).to eq(subscription_event: 'unsubscribe')
@@ -321,7 +321,7 @@ describe SlashCommands::InterpretService, services: true do
     it_behaves_like 'multiple label with same argument' do
       let(:content) { %(/label ~"#{inprogress.title}" \n/label ~#{inprogress.title}) }
       let(:issuable) { issue }
-    end	
+    end
 
     it_behaves_like 'unlabel command' do
       let(:content) { %(/unlabel ~"#{inprogress.title}") }
diff --git a/spec/support/features/issuable_slash_commands_shared_examples.rb b/spec/support/features/issuable_slash_commands_shared_examples.rb
index 5e3b8f2b23e..194620d0a68 100644
--- a/spec/support/features/issuable_slash_commands_shared_examples.rb
+++ b/spec/support/features/issuable_slash_commands_shared_examples.rb
@@ -230,31 +230,31 @@ shared_examples 'issuable record that supports slash commands in its description
 
     context "with a note subscribing to the #{issuable_type}" do
       it "creates a new todo for the #{issuable_type}" do
-        expect(issuable.subscribed?(master)).to be_falsy
+        expect(issuable.subscribed?(master, project)).to be_falsy
 
         write_note("/subscribe")
 
         expect(page).not_to have_content '/subscribe'
         expect(page).to have_content 'Your commands have been executed!'
 
-        expect(issuable.subscribed?(master)).to be_truthy
+        expect(issuable.subscribed?(master, project)).to be_truthy
       end
     end
 
     context "with a note unsubscribing to the #{issuable_type} as done" do
       before do
-        issuable.subscribe(master)
+        issuable.subscribe(master, project)
       end
 
       it "creates a new todo for the #{issuable_type}" do
-        expect(issuable.subscribed?(master)).to be_truthy
+        expect(issuable.subscribed?(master, project)).to be_truthy
 
         write_note("/unsubscribe")
 
         expect(page).not_to have_content '/unsubscribe'
         expect(page).to have_content 'Your commands have been executed!'
 
-        expect(issuable.subscribed?(master)).to be_falsy
+        expect(issuable.subscribed?(master, project)).to be_falsy
       end
     end
   end