feat: one-to-many, belongs-to

common/model_methods.go

@@ -8,3 +8,21 @@ func (model *Model) HasPrimaryKey() bool {
 	}
 	return false
 }
+
+func (model *Model) HasField(name string) bool {
+	for _, field := range model.Fields {
+		if field.Name == name {
+			return true
+		}
+	}
+	return false
+}
+
+func (model *Model) PrimaryKey() bool {
+	for _, field := range model.Fields {
+		if field.Tags.HasOption("primaryKey") {
+			return true
+		}
+	}
+	return false
+}

common/modelsParser.go

@@ -64,6 +64,11 @@ func ParseModels(pass *analysis.Pass, models *map[string]Model) {
 				model.Fields[structField.Name] = structField
 				(*models)[model.Name] = model
 			}
+
+			if _, exist := model.Fields["Id"]; !exist {
+				pass.Reportf(model.Pos, "Id field should be presented model \"%s\"", model.Name)
+			}
+
 			return false
 		})
 	}

relationsCheck/checkBelongsTo.go

@@ -0,0 +1,19 @@
+package relationsCheck
+
+import (
+	"gormlint/common"
+)
+
+func IsBelongsTo(field common.Field, model common.Model, relatedModel common.Model) bool {
+	foreignKey := field.Tags.GetParamOr("foreignKey", "Id")
+	references := field.Tags.GetParamOr("references", relatedModel.Name+"Id")
+
+	if !model.HasField(references) {
+		return false
+	}
+	if !relatedModel.HasField(foreignKey) {
+		return false
+	}
+
+	return true
+}

relationsCheck/checkManyToOne.go

@@ -0,0 +1,70 @@
+package relationsCheck
+
+import (
+	"go/token"
+	"go/types"
+	"golang.org/x/tools/go/analysis"
+	"gormlint/common"
+	"strings"
+)
+
+var alreadyReported = make(map[token.Pos]bool)
+
+func checkManyToOne(pass *analysis.Pass, nestedField common.Field, model common.Model, relatedModel common.Model) bool {
+	/* Return true, if found problems */
+
+	foreignKey := nestedField.Tags.GetParamOr("foreignKey", model.Name+"Id")
+	references := nestedField.Tags.GetParamOr("references", "Id")
+
+	if alreadyReported[nestedField.Pos] {
+		return true
+	}
+
+	if !relatedModel.HasField(foreignKey) {
+		pass.Reportf(
+			nestedField.Pos,
+			"Expected foreignKey `%s` in model `%s` for 1:M relation with model `%s`",
+			foreignKey,
+			relatedModel.Name,
+			model.Name,
+		)
+		alreadyReported[nestedField.Pos] = true
+		return true
+	}
+
+	if !model.HasField(references) {
+		pass.Reportf(
+			nestedField.Pos,
+			"Expected references `%s` in model `%s` for 1:M relation with model `%s`",
+			references,
+			model.Name,
+			relatedModel.Name,
+		)
+		alreadyReported[nestedField.Pos] = true
+		return true
+	}
+
+	foreignKeyField := relatedModel.Fields[foreignKey]
+	referencesField := model.Fields[references]
+	foreignKeyType := types.ExprString(foreignKeyField.Type)
+	referencesType := types.ExprString(referencesField.Type)
+
+	if alreadyReported[foreignKeyField.Pos] || alreadyReported[referencesField.Pos] {
+		return true
+	}
+
+	if !strings.Contains(foreignKeyType, "int") && !alreadyReported[foreignKeyField.Pos] {
+		// TODO: process UUID as foreign key type
+		pass.Reportf(foreignKeyField.Pos, "Foreign key `%s` has invalid type", foreignKeyType)
+		alreadyReported[foreignKeyField.Pos] = true
+		return true
+	}
+
+	if !strings.Contains(referencesType, "int") && !alreadyReported[referencesField.Pos] {
+		pass.Reportf(referencesField.Pos, "References key `%s` has invalid type", referencesType)
+		alreadyReported[referencesField.Pos] = true
+		return true
+	}
+
+	return false
+}

relationsCheck/checkOneToMany.go

@@ -0,0 +1,42 @@
+package relationsCheck
+
+import (
+	"fmt"
+	"go/types"
+	"golang.org/x/tools/go/analysis"
+	"gormlint/common"
+)
+
+func findBackReferenceInOneToMany(model common.Model, relatedModel common.Model) *common.Field {
+	for _, field := range relatedModel.Fields {
+		if !common.IsSlice(field.Type) {
+			continue
+		}
+		if field.Tags.HasParam("many2many") {
+			continue
+		}
+		baseType := common.ResolveBaseType(field.Type)
+		if baseType == nil {
+			continue
+		}
+		if *baseType == model.Name {
+			return &field
+		}
+	}
+	return nil
+}
+
+func isOneToMany(pass *analysis.Pass, model common.Model, relatedModel common.Model) bool {
+	backReference := findBackReferenceInOneToMany(model, relatedModel)
+	if backReference == nil {
+		return false
+	}
+	fmt.Println("Found back reference")
+	fmt.Printf("Backref type: %s\n", types.ExprString(backReference.Type))
+	fmt.Printf("Model: %s\n", model.Name)
+	fmt.Printf("Related model: %s\n", relatedModel.Name)
+	if checkManyToOne(pass, *backReference, relatedModel, model) {
+		return false
+	}
+	return true
+}

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
+}

relationsCheck/relationsCheck.go

@@ -14,76 +14,111 @@ var RelationsAnalyzer = &analysis.Analyzer{
 	Run:  run,
 }
 
-func CheckTypesOfM2M(pass *analysis.Pass, modelName string, relatedModelName string, relationName string, reference common.Field, backReference common.Field) {
+func CheckTypesOfM2M(pass *analysis.Pass, modelName string, relatedModelName string, relationName string, reference common.Field, backReference common.Field) bool {
 	if !common.IsSlice(reference.Type) {
 		pass.Reportf(reference.Pos, "M2M relation `%s` with bad type `%s` (should be a slice)", relationName, reference.Type)
-		return
+		return true
 	}
 	if !common.IsSlice(backReference.Type) {
 		pass.Reportf(backReference.Pos, "M2M relation `%s` with bad type `%s` (should be a slice)", relationName, backReference.Type)
-		return
+		return true
 	}
 
 	referenceBaseType := common.ResolveBaseType(reference.Type)
 	if referenceBaseType == nil {
 		pass.Reportf(reference.Pos, "Failed to resolve field type: `%s`", reference.Type)
-		return
+		return true
 	}
 	backReferenceBaseType := common.ResolveBaseType(backReference.Type)
 	if backReferenceBaseType == nil {
 		pass.Reportf(reference.Pos, "Failed to resolve type: `%s`", reference.Type)
-		return
+		return true
 	}
 
 	if *backReferenceBaseType != modelName {
 		pass.Reportf(backReference.Pos, "Invalid type `%s` in M2M relation (use []*%s or self-reference)", *backReferenceBaseType, modelName)
-		return
+		return true
 	}
 
 	if *referenceBaseType != relatedModelName {
 		pass.Reportf(reference.Pos, "Invalid type `%s` in M2M relation (use []*%s or self-reference)", *referenceBaseType, relatedModelName)
+		return true
 	}
+	return false
 }
 
 func CheckMany2Many(pass *analysis.Pass, models map[string]common.Model) {
-	// TODO: unexpected duplicated relations
-	var knownModels []string
+	var processedRelations []string
+
 	for _, model := range models {
 		for _, field := range model.Fields {
 			m2mRelation := field.Tags.GetParam("many2many")
 			if m2mRelation != nil {
+				if slices.Contains(processedRelations, m2mRelation.Value) {
+					continue
+				}
+				processedRelations = append(processedRelations, m2mRelation.Value)
+
 				relatedModel := common.GetModelFromType(field.Type, models)
 				if relatedModel == nil {
 					pass.Reportf(field.Pos, "Failed to resolve related model type")
-					return
+					continue
 				}
 
 				backReference := common.FindBackReferenceInM2M(m2mRelation.Value, *relatedModel)
 				if backReference != nil {
-					if slices.Contains(knownModels, relatedModel.Name) {
+					if CheckTypesOfM2M(pass, model.Name, relatedModel.Name, m2mRelation.Value, field, *backReference) {
+						continue
+					}
+					// Проверка каскадного удаления и других параметров
+					if CheckCascadeDelete(pass, field) {
 						continue
-					} else {
-						knownModels = append(knownModels, model.Name)
-						knownModels = append(knownModels, relatedModel.Name)
 					}
-					CheckTypesOfM2M(pass, model.Name, relatedModel.Name, m2mRelation.Value, field, *backReference)
-					// TODO: check foreign key and references
-					fmt.Printf("Found M2M relation between \"%s\" and \"%s\"\n", model.Name, relatedModel.Name)
 				} else {
-					// Check self-reference
+					// Обработка самоссылки
 					if model.Name == relatedModel.Name {
-						CheckTypesOfM2M(pass, model.Name, relatedModel.Name, m2mRelation.Value, field, field)
-					} else {
-						if !relatedModel.HasPrimaryKey() {
-							fmt.Printf("%#v\n", relatedModel)
-							pass.Reportf(field.Pos, "Can't build M2M relation `%s`, primary key on `%s` model is absont", m2mRelation.Value, relatedModel.Name)
-						}
-					}
-					// Here you can forbid M2M relations without back-reference
-					// TODO: process m2m without backref
+						if CheckTypesOfM2M(pass, model.Name, relatedModel.Name, m2mRelation.Value, field, field) {
+							continue
 						}
 					} else {
-				// TODO: check [] and process m:1
+						pass.Reportf(field.Pos, "M2M relation `%s` missing back-reference in model `%s`", m2mRelation.Value, relatedModel.Name)
+					}
+					if CheckCascadeDelete(pass, field) {
+						continue
+					}
+				}
+			}
+		}
+	}
+}
+
+func CheckOneToMany(pass *analysis.Pass, models map[string]common.Model) {
+	for _, model := range models {
+		for _, field := range model.Fields {
+			if common.IsSlice(field.Type) {
+				continue
+			}
+
+			baseType := common.ResolveBaseType(field.Type)
+			if baseType == nil {
+				pass.Reportf(field.Pos, "Failed to resolve field base type: `%s`", field.Type)
+				continue
+			}
+			relatedModel := common.GetModelFromType(field.Type, models)
+			if relatedModel == nil {
+				continue
+			}
+
+			foundOneToMany := isOneToMany(pass, model, *relatedModel)
+			if foundOneToMany {
+				fmt.Printf("Found 1:M relation in model `%s` with model `%s`\n", model.Name, *baseType)
+			}
+
+			if !foundOneToMany {
+				foundBelongsTo := IsBelongsTo(field, model, *relatedModel)
+				if foundBelongsTo {
+					fmt.Printf("Found belongs to relation in model `%s` with model `%s`\n", model.Name, *baseType)
+				}
 			}
 		}
 	}
@@ -93,6 +128,6 @@ func run(pass *analysis.Pass) (any, error) {
 	models := make(map[string]common.Model)
 	common.ParseModels(pass, &models)
 	CheckMany2Many(pass, models)
-
+	CheckOneToMany(pass, models)
 	return nil, nil
 }

tests/testdata/src/relations_check/negative.go

@@ -4,25 +4,49 @@ 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 { // want "Id field should be presented model \"Federation\""
+	Lands []Land `gorm:"constraint:OnDelete:CASCADE;"`
+}
+
+type Land struct {
+	Id           uint `gorm:"primaryKey"`
+	FederationId uint
 }