Return the previous project media for claim description (#1985)

Use case: we may need to update the project media information in the Relay store when it's removed from a claim.

Reference: CV2-5000.

app/graph/types/claim_description_type.rb

@@ -8,6 +8,7 @@ class ClaimDescriptionType < DefaultObject
   field :context, GraphQL::Types::String, null: true, resolver_method: :claim_context
   field :user, UserType, null: true
   field :project_media, ProjectMediaType, null: true
+  field :project_media_was, ProjectMediaType, null: true
   field :fact_check, FactCheckType, null: true do
     argument :report_status, GraphQL::Types::String, required: false, camelize: false
   end

app/models/claim_description.rb

@@ -38,6 +38,10 @@ def article_elasticsearch_data(action = 'create_or_update')
     self.index_in_elasticsearch(data)
   end
 
+  def project_media_was
+    ProjectMedia.find_by_id(self.project_media_id_before_last_save)
+  end
+
   private
 
   def set_team

lib/relay.idl

@@ -728,6 +728,7 @@ type ClaimDescription implements Node {
   id: ID!
   permissions: String
   project_media: ProjectMedia
+  project_media_was: ProjectMedia
   updated_at: String
   user: User
 }

public/relay.json

@@ -3696,6 +3696,20 @@
               "isDeprecated": false,
               "deprecationReason": null
             },
+            {
+              "name": "project_media_was",
+              "description": null,
+              "args": [
+
+              ],
+              "type": {
+                "kind": "OBJECT",
+                "name": "ProjectMedia",
+                "ofType": null
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
             {
               "name": "updated_at",
               "description": null,

test/models/claim_description_test.rb

@@ -165,4 +165,12 @@ def setup
     assert_equal 'paused', fc.reload.report_status
     assert_equal 'paused', pm.report_status(true)
   end
+
+  test "should get information from removed item" do
+    pm = create_project_media
+    cd = create_claim_description project_media: pm
+    cd.project_media = nil
+    cd.save!
+    assert_equal pm, cd.project_media_was
+  end
 end