add UsersSelfSettingsGET and POST

common/update.go

@@ -0,0 +1,32 @@
+package common
+
+import (
+	"reflect"
+	"strings"
+)
+
+// UpdateQuery is simply an SQL update query,
+// that can be built upon passed parameters.
+type UpdateQuery struct {
+	fields     []string
+	Parameters []interface{}
+}
+
+// Add adds a new field with correspective value to UpdateQuery
+func (u *UpdateQuery) Add(field string, value interface{}) *UpdateQuery {
+	val := reflect.ValueOf(value)
+	if val.Kind() == reflect.Ptr && val.IsNil() {
+		return u
+	}
+	if s, ok := value.(string); ok && s == "" {
+		return u
+	}
+	u.fields = append(u.fields, field+" = ?")
+	u.Parameters = append(u.Parameters, value)
+	return u
+}
+
+// Fields retrieves the fields joined by a comma.
+func (u *UpdateQuery) Fields() string {
+	return strings.Join(u.fields, ", ")
+}