fix: make BindQueryParameter play along with x-go-type-skip-optional-pointer

Author: swistakm

bindparam.go

@@ -318,7 +318,10 @@ func BindQueryParameter(style string, explode bool, required bool, paramName str
 	// inner code will bind the string's value to this interface.
 	var output interface{}
 
-	if required {
+	// required params are never pointers, but it may happen that optional param
+	// is not pointer as well if user decides to annotate it with
+	// x-go-type-skip-optional-pointer
+	if required || v.Kind() != reflect.Pointer {
 		// If the parameter is required, then the generated code will pass us
 		// a pointer to it: &int, &object, and so forth. We can directly set
 		// them.
@@ -414,9 +417,10 @@ func BindQueryParameter(style string, explode bool, required bool, paramName str
 			if err != nil {
 				return err
 			}
-			// If the parameter is required, and we've successfully unmarshaled
-			// it, this assigns the new object to the pointer pointer.
-			if !required {
+			// If the parameter is required (or relies on x-go-type-skip-optional-pointer),
+			// and we've successfully unmarshaled it, this assigns the new object to the
+			// pointer pointer.
+			if !required && k == reflect.Pointer {
 				dv.Set(reflect.ValueOf(output))
 			}
 			return nil

bindparam_test.go

@@ -339,6 +339,7 @@ func TestBindQueryParameter(t *testing.T) {
 		queryParams := url.Values{
 			"time":   {"2020-12-09T16:09:53+00:00"},
 			"number": {"100"},
+			"text":   {"loremipsum"},
 		}
 		// An optional time will be a pointer to a time in a parameter object
 		var optionalTime *time.Time
@@ -351,6 +352,15 @@ func TestBindQueryParameter(t *testing.T) {
 		require.NoError(t, err)
 		assert.Nil(t, optionalNumber)
 
+		var optionalNonPointerText = ""
+		err = BindQueryParameter("form", true, false, "notfound", queryParams, &optionalNonPointerText)
+		require.NoError(t, err)
+		assert.Zero(t, "")
+
+		err = BindQueryParameter("form", true, false, "text", queryParams, &optionalNonPointerText)
+		require.NoError(t, err)
+		assert.Equal(t, "loremipsum", optionalNonPointerText)
+
 		// If we require values, we require errors when they're not present.
 		err = BindQueryParameter("form", true, true, "notfound", queryParams, &optionalTime)
 		assert.Error(t, err)