Backport changes from gitlab-org/gitlab-ee!581 to CE.

!581 has a lot of changes that would cause merge conflicts if not
properly backported to CE. This commit/MR serves as a better
foundation for gitlab-org/gitlab-ee!581.

= Changes =

1. Move from `has_one {merge,push}_access_level` to `has_many`, with the
   `length` of the association limited to `1`. This is _effectively_ a
   `has_one` association, but should cause less conflicts with EE, which
   is set to `has_many`. This has a number of related changes in the
   views, specs, and factories.

2. Make `gon` variable loading more consistent (with EE!581) in the
   `ProtectedBranchesController`. Also use `::` to prefix the
   `ProtectedBranches` services, because this is required in EE.

3. Extract a `ProtectedBranchAccess` concern from the two access level
   models. This concern only has a single `humanize` method here, but
   will have more methods in EE.

4. Add `form_errors` to the protected branches creation form. This is
   not strictly required for EE compatibility, but was an oversight
   nonetheless.

2 files changed, 11 insertions, 10 deletions

diff --git a/app/views/projects/protected_branches/_create_protected_branch.html.haml b/app/views/projects/protected_branches/_create_protected_branch.html.haml
index 85d0c494ba8..d4c6fa24768 100644
--- a/app/views/projects/protected_branches/_create_protected_branch.html.haml
+++ b/app/views/projects/protected_branches/_create_protected_branch.html.haml
@@ -5,6 +5,7 @@
         Protect a branch
     .panel-body
       .form-horizontal
+        = form_errors(@protected_branch)
         .form-group
           = f.label :name, class: 'col-md-2 text-right' do
             Branch:
@@ -18,19 +19,19 @@
               %code production/*
               are supported
         .form-group
-          %label.col-md-2.text-right{ for: 'merge_access_level_attributes' }
+          %label.col-md-2.text-right{ for: 'merge_access_levels_attributes' }
             Allowed to merge:
           .col-md-10
             = dropdown_tag('Select',
                            options: { toggle_class: 'js-allowed-to-merge wide',
-                           data: { field_name: 'protected_branch[merge_access_level_attributes][access_level]', input_id: 'merge_access_level_attributes' }})
+                           data: { field_name: 'protected_branch[merge_access_levels_attributes][0][access_level]', input_id: 'merge_access_levels_attributes' }})
         .form-group
-          %label.col-md-2.text-right{ for: 'push_access_level_attributes' }
+          %label.col-md-2.text-right{ for: 'push_access_levels_attributes' }
             Allowed to push:
           .col-md-10
             = dropdown_tag('Select',
                            options: { toggle_class: 'js-allowed-to-push wide',
-                           data: { field_name: 'protected_branch[push_access_level_attributes][access_level]', input_id: 'push_access_level_attributes' }})
+                           data: { field_name: 'protected_branch[push_access_levels_attributes][0][access_level]', input_id: 'push_access_levels_attributes' }})
 
     .panel-footer
       = f.submit 'Protect', class: 'btn-create btn', disabled: true
diff --git a/app/views/projects/protected_branches/_protected_branch.html.haml b/app/views/projects/protected_branches/_protected_branch.html.haml
index e2e01ee78f8..eb4c67daa80 100644
--- a/app/views/projects/protected_branches/_protected_branch.html.haml
+++ b/app/views/projects/protected_branches/_protected_branch.html.haml
@@ -14,15 +14,15 @@
       - else
         (branch was removed from repository)
   %td
-    = hidden_field_tag "allowed_to_merge_#{protected_branch.id}", protected_branch.merge_access_level.access_level
-    = dropdown_tag( (protected_branch.merge_access_level.humanize || 'Select') ,
+    = hidden_field_tag "allowed_to_merge_#{protected_branch.id}", protected_branch.merge_access_levels.first.access_level
+    = dropdown_tag( (protected_branch.merge_access_levels.first.humanize || 'Select') ,
                    options: { toggle_class: 'js-allowed-to-merge', dropdown_class: 'dropdown-menu-selectable js-allowed-to-merge-container',
-                   data: { field_name: "allowed_to_merge_#{protected_branch.id}" }})
+                   data: { field_name: "allowed_to_merge_#{protected_branch.id}", access_level_id: protected_branch.merge_access_levels.first.id }})
   %td
-    = hidden_field_tag "allowed_to_push_#{protected_branch.id}", protected_branch.push_access_level.access_level
-    = dropdown_tag( (protected_branch.push_access_level.humanize || 'Select') ,
+    = hidden_field_tag "allowed_to_push_#{protected_branch.id}", protected_branch.push_access_levels.first.access_level
+    = dropdown_tag( (protected_branch.push_access_levels.first.humanize || 'Select') ,
                    options: { toggle_class: 'js-allowed-to-push', dropdown_class: 'dropdown-menu-selectable js-allowed-to-push-container',
-                   data: { field_name: "allowed_to_push_#{protected_branch.id}" }})
+                   data: { field_name: "allowed_to_push_#{protected_branch.id}", access_level_id: protected_branch.push_access_levels.first.id }})
   - if can_admin_project
     %td
       = link_to 'Unprotect', [@project.namespace.becomes(Namespace), @project, protected_branch], data: { confirm: 'Branch will be writable for developers. Are you sure?' }, method: :delete, class: 'btn btn-warning'