Add `account_id` param to `GET /api/v1/notifications` (#10796)

* Add `from_account` to notifications API

this adds the ability to filter notifications by the account they
originated from

* passing a non-existent user should cause none to be returned

* Fix codeclimate warnings

* fix more codeclimate warnings

* make requested changes:

* use account id instead of user@domain
* name the param `account_id` instead of `from_account`

* Don't use `return` in a lambda

2 files changed, 11 insertions, 3 deletions

diff --git a/app/controllers/api/v1/notifications_controller.rb b/app/controllers/api/v1/notifications_controller.rb
index 3b492c516..c91753ae7 100644
--- a/app/controllers/api/v1/notifications_controller.rb
+++ b/app/controllers/api/v1/notifications_controller.rb
@@ -53,7 +53,7 @@ class Api::V1::NotificationsController < Api::BaseController
   end
 
   def browserable_account_notifications
-    current_account.notifications.browserable(exclude_types)
+    current_account.notifications.browserable(exclude_types, from_account)
   end
 
   def target_statuses_from_notifications
@@ -90,6 +90,10 @@ class Api::V1::NotificationsController < Api::BaseController
     val
   end
 
+  def from_account
+    params[:account_id]
+  end
+
   def pagination_params(core_params)
     params.slice(:limit, :exclude_types).permit(:limit, exclude_types: []).merge(core_params)
   end
diff --git a/app/models/notification.rb b/app/models/notification.rb
index 300269e24..498673ff1 100644
--- a/app/models/notification.rb
+++ b/app/models/notification.rb
@@ -41,9 +41,13 @@ class Notification < ApplicationRecord
   validates :account_id, uniqueness: { scope: [:activity_type, :activity_id] }
   validates :activity_type, inclusion: { in: TYPE_CLASS_MAP.values }
 
-  scope :browserable, ->(exclude_types = []) {
+  scope :browserable, ->(exclude_types = [], account_id = nil) {
     types = TYPE_CLASS_MAP.values - activity_types_from_types(exclude_types + [:follow_request])
-    where(activity_type: types)
+    if account_id.nil?
+      where(activity_type: types)
+    else
+      where(activity_type: types, from_account_id: account_id)
+    end
   }
 
   cache_associated :from_account, status: STATUS_INCLUDES, mention: [status: STATUS_INCLUDES], favourite: [:account, status: STATUS_INCLUDES], follow: :account, poll: [status: STATUS_INCLUDES]