Merge branch '28124-mrs-don-t-show-all-merge-errors' into 'master'

Show merge errors in merge request widget

Closes #28124 and gitlab-ee#1652

See merge request !9229

Signed-off-by: Rémy Coutable <remy@rymai.me>

2 files changed, 8 insertions, 8 deletions

diff --git a/app/assets/javascripts/merge_request_widget.js.es6 b/app/assets/javascripts/merge_request_widget.js.es6
index e47047c4cca..ff0abcd8f81 100644
--- a/app/assets/javascripts/merge_request_widget.js.es6
+++ b/app/assets/javascripts/merge_request_widget.js.es6
@@ -106,7 +106,7 @@
               urlSuffix = deleteSourceBranch ? '?deleted_source_branch=true' : '';
               return window.location.href = window.location.pathname + urlSuffix;
             } else if (data.merge_error) {
-              return _this.$widgetBody.html("<h4>" + data.merge_error + "</h4>");
+              return $('.mr-widget-body').html("<h4>" + data.merge_error + "</h4>");
             } else {
               callback = function() {
                 return merge_request_widget.mergeInProgress(deleteSourceBranch);
diff --git a/app/services/merge_requests/merge_service.rb b/app/services/merge_requests/merge_service.rb
index ab9056a3250..395bfd17ce0 100644
--- a/app/services/merge_requests/merge_service.rb
+++ b/app/services/merge_requests/merge_service.rb
@@ -11,14 +11,14 @@ module MergeRequests
     def execute(merge_request)
       @merge_request = merge_request
 
-      return log_merge_error('Merge request is not mergeable', true) unless @merge_request.mergeable?
+      unless @merge_request.mergeable?
+        return log_merge_error('Merge request is not mergeable', save_message_on_model: true)
+      end
 
       merge_request.in_locked_state do
         if commit
           after_merge
           success
-        else
-          log_merge_error('Can not merge changes', true)
         end
       end
     end
@@ -39,11 +39,11 @@ module MergeRequests
       if commit_id
         merge_request.update(merge_commit_sha: commit_id)
       else
-        merge_request.update(merge_error: 'Conflicts detected during merge')
+        log_merge_error('Conflicts detected during merge', save_message_on_model: true)
         false
       end
     rescue GitHooksService::PreReceiveError => e
-      merge_request.update(merge_error: e.message)
+      log_merge_error(e.message, save_message_on_model: true)
       false
     rescue StandardError => e
       merge_request.update(merge_error: "Something went wrong during merge: #{e.message}")
@@ -66,10 +66,10 @@ module MergeRequests
       @merge_request.force_remove_source_branch? ? @merge_request.author : current_user
     end
 
-    def log_merge_error(message, http_error = false)
+    def log_merge_error(message, save_message_on_model: false)
       Rails.logger.error("MergeService ERROR: #{merge_request_info} - #{message}")
 
-      error(message) if http_error
+      @merge_request.update(merge_error: message) if save_message_on_model
     end
 
     def merge_request_info