Modify api key error when gem does not belong to the user

app/models/api_key.rb

@@ -39,7 +39,7 @@ def mfa_enabled?
   def rubygem_id=(id)
     self.ownership = id.blank? ? nil : user.ownerships.find_by!(rubygem_id: id)
   rescue ActiveRecord::RecordNotFound
-    errors.add :rubygem, "that is selected cannot be scoped to this key"
+    errors.add :rubygem, "must be a gem that you are an owner of"
   end
 
   def rubygem_name=(name)

test/functional/api_keys_controller_test.rb

@@ -147,7 +147,7 @@ class ApiKeysControllerTest < ActionController::TestCase
         should "display error with invalid id" do
           post :create, params: { api_key: { name: "gem scope", add_owner: true, rubygem_id: -1 } }
 
-          assert_equal "Rubygem that is selected cannot be scoped to this key", flash[:error]
+          assert_equal "Rubygem must be a gem that you are an owner of", flash[:error]
           assert_empty @user.reload.api_keys
         end
 
@@ -235,7 +235,7 @@ class ApiKeysControllerTest < ActionController::TestCase
           assert_no_changes @api_key do
             patch :update, params: { api_key: { rubygem_id: -1 }, id: @api_key.id }
 
-            assert_equal "Rubygem that is selected cannot be scoped to this key", flash[:error]
+            assert_equal "Rubygem must be a gem that you are an owner of", flash[:error]
           end
         end
 

test/models/api_key_test.rb

@@ -102,8 +102,7 @@ class ApiKeyTest < ActiveSupport::TestCase
 
       should "add error when id is not associated with the user" do
         api_key = ApiKey.new(hashed_key: SecureRandom.hex(24), push_rubygem: true, user: @ownership.user, rubygem_id: -1)
-
-        assert_contains api_key.errors[:rubygem], "that is selected cannot be scoped to this key"
+        assert_contains api_key.errors[:rubygem], "must be a gem that you are an owner of"
       end
     end
 
@@ -121,7 +120,7 @@ class ApiKeyTest < ActiveSupport::TestCase
       should "add error when gem is not associated with the user" do
         rubygem = create(:rubygem, name: "another-gem")
         api_key = ApiKey.new(hashed_key: SecureRandom.hex(24), push_rubygem: true, user: @ownership.user, rubygem_name: rubygem.name)
-        assert_contains api_key.errors[:rubygem], "that is selected cannot be scoped to this key"
+        assert_contains api_key.errors[:rubygem], "must be a gem that you are an owner of"
       end
 
       should "add error when name is not a valid gem name" do

test/system/api_keys_test.rb

@@ -100,7 +100,7 @@ class ApiKeysTest < ApplicationSystemTestCase
     click_button "Create"
 
     assert page.has_css? ".flash"
-    assert page.has_content? "Rubygem that is selected cannot be scoped to this key"
+    assert page.has_content? "Rubygem must be a gem that you are an owner of"
     assert_empty @user.api_keys
   end
 
@@ -211,7 +211,7 @@ class ApiKeysTest < ApplicationSystemTestCase
     click_button "Update"
 
     assert page.has_css? ".flash"
-    assert page.has_content? "Rubygem that is selected cannot be scoped to this key"
+    assert page.has_content? "Rubygem must be a gem that you are an owner of"
     assert_equal @ownership.rubygem, api_key.reload.rubygem
   end