英文:
I don't know why edge generate doesn't work in entgo
问题
我正在尝试使用Golang和Entgo构建应用程序，但在Entgo生成方面遇到了问题。
下面是用户表的代码：
type User struct {ent.Schema}func (User) Fields() []ent.Field {return []ent.Field{field.String("nickname").NotEmpty().Unique(),field.String("user_type").Default("guest"),field.Time("created_at").Default(time.Now()),field.Time("updated_at").Default(time.Now()).UpdateDefault(time.Now()),}}func (User) Edges() []ent.Edge {return []ent.Edge{edge.To("token", Token.Type),}}
下面是关于令牌的代码：
type Token struct {ent.Schema}func (Token) Fields() []ent.Field {return []ent.Field{field.String("token"),field.Int("user_id"),field.Time("created_at").Default(time.Now()),field.Time("updated_at").Default(time.Now()).UpdateDefault(time.Now()),}}func (Token) Edges() []ent.Edge {return []ent.Edge{edge.From("user", User.Type).Ref("users").Field("user_id"),}}
我尝试像这样生成Entgo：
go generate ./ent
但是它没有起作用，并且给出了以下错误：
entc/gen: resolve "Token" relations: edge "users" is missing for inverse edge: Token.user(User)exit status 1
我不知道出了什么问题，请帮忙解决。
英文:
i'm trying build app by golang and entgo and falling problem about entgo generate,
below is user table code
type user table// User holds the schema definition for the User entity.type User struct {ent.Schema}// Fields of the User.func (User) Fields() []ent.Field {return []ent.Field{field.String("nickname").NotEmpty().Unique(),field.String("user_type").Default("guest"),field.Time("created_at").Default(time.Now()),field.Time("updated_at").Default(time.Now()).UpdateDefault(time.Now()),}}// Edges of the User.func (User) Edges() []ent.Edge {return []ent.Edge{edge.To("token", Token.Type),}}
and below is about token
// Token holds the schema definition for the Token entity.type Token struct {ent.Schema}// Fields of the Token.func (Token) Fields() []ent.Field {return []ent.Field{field.String("token"),field.Int("user_id"),field.Time("created_at").Default(time.Now()),field.Time("updated_at").Default(time.Now()).UpdateDefault(time.Now()),}}// Edges of the Token.func (Token) Edges() []ent.Edge {return []ent.Edge{edge.From("user", User.Type).Ref("users").Field("user_id"),}}
and im try generate entgo like this
go generate ./ent
but it is not working and i give error like below,
entc/gen: resolve "Token" relations: edge "users" is missing for inverse edge: Token.user(User)exit status 1
i dont know what
I don't know what's wrong, please help
答案1
得分: 0
你已经颠倒了edge.To和edge.From的顺序。
请参考文档中的说明：
使用edge.To构建器定义边的模式拥有该关系，而使用edge.From构建器仅为关系提供一个反向引用（具有不同的名称）。
从你的示例中看，你似乎想要实现一个一对多的关系，其中一个User可以关联多个Token。
请将两个结构体上的Edges方法更改为：
// User的边。func (User) Edges() []ent.Edge {return []ent.Edge{edge.From("token", Token.Type).Ref("users"),}}
和
// Token的边。func (Token) Edges() []ent.Edge {return []ent.Edge{edge.To("users", User.Type).Unique().Field("user_id").Required(),}}
英文:
You've reversed the order of edge.To / edge.From.
See the ent docs:
> A schema that defines an edge using the edge.To builder owns the relation, unlike using the edge.From builder that gives only a back-reference for the relation (with a different name).
From your example it looks like you're trying to achieve a O2M relation where a User can have many Tokens associated.
Change the Edges methods on both structs to be:
// Edges of the User.func (User) Edges() []ent.Edge {return []ent.Edge{edge.From("token", Token.Type).Ref("users"),}}
and
// Edges of the Token.func (Token) Edges() []ent.Edge {return []ent.Edge{edge.To("users", User.Type).Unique().Field("user_id").Required(),}}
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