fix(smart-actions): use changedField instead of comparing values to trigger the correct change hook (#396)

Author: GuillaumeCisco

app/controllers/forest_liana/actions_controller.rb

@@ -86,8 +86,7 @@ def change
         formatted_fields = context[:fields].clone # clone for following test on is_same_data_structure
 
         # Call the user-defined change hook.
-        field_name = params[:fields].select { |field| field[:value] != field[:previousValue] }[0][:field]
-        result = action.hooks[:change][field_name].(context)
+        result = action.hooks[:change][params[:changedField]].(context)
 
         handle_result(result, formatted_fields, action)
       end

spec/requests/actions_controller_spec.rb

@@ -109,7 +109,7 @@
 
     describe 'call /change' do
       updated_foo = foo.clone.merge({:previousValue => nil, :value => 'bar'})
-      params = {recordIds: [1], fields: [updated_foo], collectionName: 'Island'}
+      params = {recordIds: [1], fields: [updated_foo], collectionName: 'Island', changedField: 'foo'}
 
       it 'should respond 200' do
         post '/forest/actions/my_action/hooks/change', JSON.dump(params), 'CONTENT_TYPE' => 'application/json'