feat: many-to-one check, constrints check

tests/testdata/src/relations_check/negative.go

@@ -4,25 +4,48 @@ package relations_check
 
 type Library struct {
 	Id    uint    `gorm:"primaryKey"`
-	Books []*Book `gorm:"many2many:library_book;"`
+	Books []*Book `gorm:"many2many:library_book;constraint:OnDelete:CASCADE;"`
 }
 
 type Book struct {
 	Id        uint       `gorm:"primaryKey"`
-	Libraries []*Library `gorm:"many2many:library_book;"`
+	Libraries []*Library `gorm:"many2many:library_book;constraint:OnDelete:CASCADE;"`
 }
 
 type Employee struct {
 	Id           uint        `gorm:"primaryKey"`
-	Subordinates []*Employee `gorm:"many2many:employee_subordinates;"` // self-reference
+	Subordinates []*Employee `gorm:"many2many:employee_subordinates;constraint:OnDelete:CASCADE;"` // self-reference
 }
 
 type Publisher struct {
 	Id      uint      `gorm:"primaryKey"`
-	Writers []*Writer `gorm:"many2many:publisher_books;"`
+	Writers []*Writer `gorm:"many2many:publisher_books;constraint:OnDelete:CASCADE;"`
 }
 
 type Writer struct {
 	Id         uint        `gorm:"primaryKey"`
-	Publishers []Publisher `gorm:"many2many:publisher_books;"`
+	Publishers []Publisher `gorm:"many2many:publisher_books;constraint:OnDelete:CASCADE;"`
+}
+
+// One-to-many
+type Comment struct {
+	Id            uint `gorm:"primaryKey"`
+	CommentatorId uint
+	Commentator   Commentator
+}
+
+type Commentator struct {
+	Id       uint      `gorm:"primaryKey"`
+	Comments []Comment `gorm:"foreignKey:CommentatorId;references:Id;constraint:OnDelete:CASCADE;"`
+}
+
+type Post struct {
+	Id    uint    `gorm:"primaryKey"`
+	Files []*File `gorm:"constraint:OnDelete:CASCADE;"`
+}
+
+type File struct {
+	Id     uint `gorm:"primaryKey"`
+	PostId uint
+	Post   Post
 }

tests/testdata/src/relations_check/positive.go

@@ -2,20 +2,39 @@ package relations_check
 
 type Student struct {
 	Id      uint     `gorm:"primaryKey"`
-	Courses []Course `gorm:"many2many:student_courses;"`
+	Courses []Course `gorm:"many2many:student_courses;constraint:OnDelete:CASCADE;"`
 }
 
 type Course struct {
 	Id       uint     `gorm:"primaryKey"`
-	Students []Course `gorm:"many2many:student_courses;"` // want "Invalid type `Course` in M2M relation \\(use \\[\\]\\*Student or self-reference\\)"
+	Students []Course `gorm:"many2many:student_courses;constraint:OnDelete:CASCADE"` // want "Invalid type `Course` in M2M relation \\(use \\[\\]\\*Student or self-reference\\)"
 }
 
 type Author struct {
 	Id       uint      `gorm:"primaryKey"`
-	Articles []Article `gorm:"many2many:author_articles;"`
+	Articles []Article `gorm:"many2many:author_articles;constraint:OnDelete:CASCADES;"`
 }
 
 type Article struct {
 	Id      uint   `gorm:"primaryKey"`
-	Authors Author `gorm:"many2many:author_articles;"` // want "M2M relation `author_articles` with bad type `Author` \\(should be a slice\\)"
+	Authors Author `gorm:"many2many:author_articles;constraint:OnDelete:CASCADE;"` // want "M2M relation `author_articles` with bad type `Author` \\(should be a slice\\)"
+}
+
+type Kuzbass struct {
+	Id     uint   `gorm:"primaryKey"`
+	Cities []City // want "Expected foreignKey `KuzbassId` in model `City` for 1:M relation with model `Kuzbass`"
+}
+
+type City struct {
+	Id      uint `gorm:"primaryKey"`
+	Kuzbass Kuzbass
+}
+
+type Federation struct {
+	Lands []Land `gorm:"constraint:OnDelete:CASCADE;"` // want ""
+}
+
+type Land struct {
+	Id           uint `gorm:"primaryKey"`
+	FederationId uint
 }