Add CollectionFormatter

api/writer/json.go

@@ -80,6 +80,11 @@ func (j *JSONResponseWriter) writeInterfaceSlice(builder *builder.Builder, apiCo
 			collection.Data = append(collection.Data, v)
 		}
 	}
+
+	if apiContext.Schema.CollectionFormatter != nil {
+		apiContext.Schema.CollectionFormatter(apiContext, collection)
+	}
+
 	return collection
 }
 

types/server_types.go

@@ -55,6 +55,8 @@ type Validator func(request *APIContext, schema *Schema, data map[string]interfa
 
 type Formatter func(request *APIContext, resource *RawResource)
 
+type CollectionFormatter func(request *APIContext, collection *GenericCollection)
+
 type ErrorHandler func(request *APIContext, err error)
 
 type SubContextAttributeProvider interface {

types/types.go

@@ -112,6 +112,7 @@ type Schema struct {
 	DeleteHandler       RequestHandler      `json:"-"`
 	UpdateHandler       RequestHandler      `json:"-"`
 	Formatter           Formatter           `json:"-"`
+	CollectionFormatter CollectionFormatter `json:"-"`
 	ErrorHandler        ErrorHandler        `json:"-"`
 	Validator           Validator           `json:"-"`
 	Store               Store               `json:"-"`