Merge branch 'backport-md-cache-fix' into 'master'

Work around a hard-to-understand failure in `CacheMarkdownField`

See merge request !10918

Author: dzaporozhets

app/models/concerns/cache_markdown_field.rb

@@ -120,7 +120,9 @@ def attributes
       attrs
     end
 
-    before_save :refresh_markdown_cache!, if: :invalidated_markdown_cache?
+    # Using before_update here conflicts with elasticsearch-model somehow
+    before_create :refresh_markdown_cache!, if: :invalidated_markdown_cache?
+    before_update :refresh_markdown_cache!, if: :invalidated_markdown_cache?
   end
 
   class_methods do

spec/models/concerns/cache_markdown_field_spec.rb

@@ -18,7 +18,7 @@ def attributes
     end
 
     extend ActiveModel::Callbacks
-    define_model_callbacks :save
+    define_model_callbacks :create, :update
 
     include CacheMarkdownField
     cache_markdown_field :foo
@@ -56,7 +56,7 @@ def write_attribute(name, value)
     end
 
     def save
-      run_callbacks :save do
+      run_callbacks :update do
         changes_applied
       end
     end