3 files changed, 16 insertions, 17 deletions
diff --git a/app/services/merge_requests/merge_base_service.rb b/app/services/merge_requests/merge_base_service.rb
index 095bdca5472..1ed396cee1e 100644
--- a/app/services/merge_requests/merge_base_service.rb
+++ b/app/services/merge_requests/merge_base_service.rb
@@ -28,6 +28,17 @@ module MergeRequests
 
     private
 
+    def check_source
+      unless source
+        raise_error('No source for merge')
+      end
+    end
+
+    # Overridden in EE.
+    def check_size_limit
+      # No-op
+    end
+
     # Overridden in EE.
     def error_check!
       # No-op
diff --git a/app/services/merge_requests/merge_service.rb b/app/services/merge_requests/merge_service.rb
index d8a78001b79..3e0f5aa181c 100644
--- a/app/services/merge_requests/merge_service.rb
+++ b/app/services/merge_requests/merge_service.rb
@@ -48,13 +48,13 @@ module MergeRequests
     def error_check!
       super
 
+      check_source
+
       error =
         if @merge_request.should_be_rebased?
           'Only fast-forward merge is allowed for your project. Please update your source branch'
         elsif !@merge_request.mergeable?
           'Merge request is not mergeable'
-        elsif !source
-          'No source for merge'
         end
 
       raise_error(error) if error
diff --git a/app/services/merge_requests/merge_to_ref_service.rb b/app/services/merge_requests/merge_to_ref_service.rb
index 0ea50a5dbf5..37b5805ae7e 100644
--- a/app/services/merge_requests/merge_to_ref_service.rb
+++ b/app/services/merge_requests/merge_to_ref_service.rb
@@ -16,7 +16,7 @@ module MergeRequests
     def execute(merge_request)
       @merge_request = merge_request
 
-      validate!
+      error_check!
 
       commit_id = commit
 
@@ -39,21 +39,9 @@ module MergeRequests
       merge_request.diff_head_sha
     end
 
-    def validate!
-      error_check!
-    end
-
+    override :error_check!
     def error_check!
-      super
-
-      error =
-        if !hooks_validation_pass?(merge_request)
-          hooks_validation_error(merge_request)
-        elsif source.blank?
-          'No source for merge'
-        end
-
-      raise_error(error) if error
+      check_source
     end
 
     ##