Fix Error 500 when forking projects with Gravatar disabled

When Gravatar is disabled, the "no avatar" is used, which failed
to revert to the colorful identity icons for namespaces.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/50254

app/helpers/avatars_helper.rb

 # frozen_string_literal: true
 
 module AvatarsHelper
-  def project_icon(project_id, options = {})
-    source_icon(Project, project_id, options)
+  def project_icon(project, options = {})
+    source_icon(project, options)
   end
 
-  def group_icon(group_id, options = {})
-    source_icon(Group, group_id, options)
+  def group_icon(group, options = {})
+    source_icon(group, options)
   end
 
   # Takes both user and email and returns the avatar_icon by
@@ -110,16 +110,11 @@ module AvatarsHelper
 
   private
 
-  def source_icon(klass, source_id, options = {})
-    source =
-      if source_id.respond_to?(:avatar_url)
-        source_id
-      else
-        klass.find_by_full_path(source_id)
-      end
+  def source_icon(source, options = {})
+    avatar_url = source.try(:avatar_url)
 
-    if source.avatar_url
-      image_tag source.avatar_url, options
+    if avatar_url
+      image_tag avatar_url, options
     else
       source_identicon(source, options)
     end

app/views/projects/edit.html.haml

@@ -47,7 +47,7 @@
           .form-group
             - if @project.avatar?
               .avatar-container.s160.append-bottom-15
-                = project_icon(@project.full_path, alt: '', class: 'avatar project-avatar s160', width: 160, height: 160)
+                = project_icon(@project, alt: '', class: 'avatar project-avatar s160', width: 160, height: 160)
             - if @project.avatar_in_git
               %p.light
                 = _("Project avatar in repository: %{link}").html_safe % { link: @project.avatar_in_git }

app/views/projects/forks/_fork_button.html.haml

@@ -5,7 +5,7 @@
   .bordered-box.fork-thumbnail.text-center.prepend-left-default.append-right-default.prepend-top-default.append-bottom-default.forked
     = link_to project_path(forked_project) do
       - if /no_((\w*)_)*avatar/.match(avatar)
-        = project_icon(namespace, class: "avatar s100 identicon")
+        = group_icon(namespace, class: "avatar s100 identicon")
       - else
         .avatar-container.s100
           = image_tag(avatar, class: "avatar s100")
@@ -18,7 +18,7 @@
         class: ("disabled has-tooltip" unless can_create_project),
         title: (_('You have reached your project limit') unless can_create_project) do
       - if /no_((\w*)_)*avatar/.match(avatar)
-        = project_icon(namespace, class: "avatar s100 identicon")
+        = group_icon(namespace, class: "avatar s100 identicon")
       - else
         .avatar-container.s100
           = image_tag(avatar, class: "avatar s100")

changelogs/unreleased/sh-fix-forks-with-no-gravatar.yml

+---
+title: Fix Error 500 when forking projects with Gravatar disabled
+merge_request:
+author:
+type: fixed

spec/features/projects/fork_spec.rb

@@ -53,6 +53,18 @@ describe 'Project fork' do
     expect(current_path).to have_content(/#{user.namespace.name}/i)
   end
 
+  it 'shows avatars when Gravatar is disabled' do
+    stub_application_setting(gravatar_enabled: false)
+
+    visit project_path(project)
+
+    click_link 'Fork'
+
+    page.within('.fork-thumbnail-container') do
+      expect(page).to have_css('div.identicon')
+    end
+  end
+
   it 'shows the forked project on the list' do
     visit project_path(project)
 

spec/helpers/avatars_helper_spec.rb

@@ -32,18 +32,6 @@ describe AvatarsHelper do
       end
     end
 
-    context 'when providing a project path' do
-      it_behaves_like 'resource with a default avatar', 'project' do
-        let(:resource) { create(:project, name: 'foo') }
-        let(:helper_args) { [resource.full_path] }
-      end
-
-      it_behaves_like 'resource with a custom avatar', 'project' do
-        let(:resource) { create(:project, :public, avatar: File.open(uploaded_image_temp_path)) }
-        let(:helper_args) { [resource.full_path] }
-      end
-    end
-
     context 'when providing a group' do
       it_behaves_like 'resource with a default avatar', 'group' do
         let(:resource) { create(:group, name: 'foo') }
@@ -55,18 +43,6 @@ describe AvatarsHelper do
         let(:helper_args) { [resource] }
       end
     end
-
-    context 'when providing a group path' do
-      it_behaves_like 'resource with a default avatar', 'group' do
-        let(:resource) { create(:group, name: 'foo') }
-        let(:helper_args) { [resource.full_path] }
-      end
-
-      it_behaves_like 'resource with a custom avatar', 'group' do
-        let(:resource) { create(:group, avatar: File.open(uploaded_image_temp_path)) }
-        let(:helper_args) { [resource.full_path] }
-      end
-    end
   end
 
   describe '#avatar_icon_for' do