feat: many2many relations check

common/model.go

@@ -3,6 +3,7 @@ package common
 import (
 	"go/ast"
 	"go/token"
+	"strings"
 )
 
 type Field struct {
@@ -21,3 +22,50 @@ type Model struct {
 	Pos     token.Pos
 	Comment string
 }
+
+type Param struct {
+	Name  string
+	Value string
+}
+
+func (model *Model) GetParam(name string) *Param {
+	for _, field := range model.Fields {
+		for _, param := range field.Params {
+			pair := strings.SplitN(param, ":", 2)
+			if len(pair) != 2 {
+				return nil
+			}
+			if strings.ToLower(pair[0]) == strings.ToLower(name) {
+				return &Param{
+					Name:  pair[0],
+					Value: pair[1],
+				}
+			}
+		}
+	}
+	return nil
+}
+
+func (model *Model) HasParam(name string) bool {
+	return model.GetParam(name) != nil
+}
+
+func (field *Field) HasParam(name string) bool {
+	return field.GetParam(name) != nil
+}
+
+func (field *Field) GetParam(name string) *Param {
+	for _, param := range field.Params {
+		pair := strings.SplitN(param, ":", 2)
+		if len(pair) != 2 {
+			return nil
+		}
+		if strings.ToLower(pair[0]) == strings.ToLower(name) {
+			return &Param{
+				Name:  pair[0],
+				Value: pair[1],
+			}
+		}
+	}
+	return nil
+}