chore(golang): user can provide a type of DTO member

By default, string type is used. Also, the value is optional (nullable).

Example of specifying an integer type:
dto:
  fields:
    counter:
      type: integer

Part of #9

Author: php-coder

examples/go/routes.go

@@ -10,7 +10,7 @@ import "github.com/go-chi/chi"
 import "github.com/jmoiron/sqlx"
 
 type CounterDto struct {
-	Counter *string `json:"counter,omitempty" db:"counter"`
+	Counter *integer `json:"counter,omitempty" db:"counter"`
 }
 
 type CategoryDto struct {

examples/js/endpoints.yaml

@@ -3,6 +3,9 @@
     query: SELECT COUNT(*) AS counter FROM categories
     dto:
       name: CounterDto
+      fields:
+        counter:
+          type: integer
 
 - path: /v1/collections/:collectionId/categories/count
   get:
@@ -12,6 +15,10 @@
         JOIN series s
           ON s.id = cs.series_id
        WHERE cs.collection_id = :p.collectionId
+    dto:
+      fields:
+        counter:
+          type: integer
 
 - path: /v1/categories
   get_list:

src/templates/routes.go.ejs

@@ -70,12 +70,12 @@ function extractProperties(queryAst) {
 	return [];
 }
 
-function addTypes(props) {
+function addTypes(props, fieldsInfo) {
 	return props.map(prop => {
+		const hasTypeInfo = fieldsInfo.hasOwnProperty(prop) && fieldsInfo[prop].hasOwnProperty('type');
 		return {
 			"name": prop,
-			// TODO: resolve/autoguess types
-			"type": "*string"
+			"type": hasTypeInfo ? '*' + fieldsInfo[prop].type : '*string'
 		}
 	});
 }
@@ -90,7 +90,8 @@ function query2dto(parser, method) {
 		console.debug(queryAst);
 		return null;
 	}
-	const propsWithTypes = addTypes(props);
+	const fieldsInfo = method.dto && method.dto.fields ? method.dto.fields : {};
+	const propsWithTypes = addTypes(props, fieldsInfo);
 	const hasName = method.dto && method.dto.name && method.dto.name.length > 0;
 	const name = hasName ? method.dto.name : "Dto" + ++globalDtoCounter;
 	return {