api controller for suggesting fields

app/controllers/api/v1/api_controller.rb

@@ -0,0 +1,6 @@
+module Api
+  module V1
+    class ApiController
+    end
+  end
+end

app/controllers/api/v1/attribute_fields_controller.rb

@@ -0,0 +1,23 @@
+module Api
+  module V1
+    class AttributeFieldsController < ApiController
+      def suggest
+        category_label = params[:category]
+        entity_type    = params.fetch(:entity_type, '').downcase
+
+        category_query = AttributeCategory.where(label: category_label)
+        category_query = category_query.where(entity_type: entity_type) unless entity_type.empty?
+        
+        suggestions = AttributeField.where(attribute_category_id: category_query.pluck(:id))
+          .group(:label)
+          .order('count_id DESC')
+          .limit(50)
+          .count(:id)
+          .reject { |k, v| v < 10 }
+          .keys
+
+        render json: suggestions.to_json
+      end
+    end
+  end
+end

config/routes.rb

@@ -177,6 +177,14 @@ end
   end
 
   # API Endpoints
+  namespace :api do
+    namespace :v1 do
+      scope '/fields' do
+        get '/suggest', to: 'attribute_fields#suggest'
+      end
+    end
+  end
+
   scope '/generate' do
     # General information