Use snake_case for Ruby variables

app/views/projects/protected_branches/_access_level_dropdown.html.haml

-- defaultLabel = 'Select'
-- dropdownLabel = defaultLabel
+- default_label = 'Select'
+- dropdown_label = default_label
 
 %div{ class: "#{input_basic_name}-container" }
   - if access_levels.present?
     - access_levels.map.with_index do |level, i|
-      - if (level.type == :user)
-        - fieldKey = 'user_id' 
+      - if level.type == :user
+        - field_key = 'user_id' 
         - value = level.user_id
       - else
-        - fieldKey = 'access_level'
+        - field_key = 'access_level'
         - value = level.access_level
-      %input{ type: 'hidden', name: "protected_branch[#{input_basic_name}_attributes][#{i}][#{fieldKey}]",
+      %input{ type: 'hidden', name: "protected_branch[#{input_basic_name}_attributes][#{i}][#{field_key}]",
                               value: value, data: { type: level.type, id: level.id } }
     
-    - dropdownLabel = [pluralize(level_frequencies[:role], 'role'), pluralize(level_frequencies[:user], 'user')].to_sentence
+    - dropdown_label = [pluralize(level_frequencies[:role], 'role'), pluralize(level_frequencies[:user], 'user')].to_sentence
 
-  = dropdown_tag(dropdownLabel, options: { toggle_class: "#{toggle_class} js-multiselect", dropdown_class: 'dropdown-menu-user dropdown-menu-selectable', filter: true,
-                                      data: { default_label: defaultLabel } })
+  = dropdown_tag(dropdown_label, options: { toggle_class: "#{toggle_class} js-multiselect", dropdown_class: 'dropdown-menu-user dropdown-menu-selectable', filter: true,
+                                      data: { default_label: default_label } })