feat: many-to-one check, constrints check

relationsCheck/constraints.go

@@ -0,0 +1,29 @@
+package relationsCheck
+
+import (
+	"golang.org/x/tools/go/analysis"
+	"gormlint/common"
+	"strings"
+)
+
+func CheckCascadeDelete(pass *analysis.Pass, field common.Field) bool {
+	if !field.Tags.HasParam("constraint") {
+		pass.Reportf(field.Pos, "field %s should have a constraint", field.Name)
+		return true
+	}
+	constraintValue := field.Tags.GetParam("constraint").Value
+	pair := strings.Split(constraintValue, ":")
+	trigger, value := pair[0], pair[1]
+	if strings.ToLower(trigger) == "OnDelete" && strings.ToUpper(value) != "CASCADE" {
+		pass.Reportf(field.Pos, "field have invalid constraint on `OnDelete trigger`")
+		return true
+	}
+
+	if field.Tags.HasParam("OnDelete") {
+		if strings.ToUpper(field.Tags.GetParam("OnDelete").Value) != "CASCADE" {
+			pass.Reportf(field.Pos, "field have invalid constraint on `OnDelete` trigger")
+			return true
+		}
+	}
+	return false
+}