go-gorm

问题 I have a model in GORM with Postgres as database. The model is like this type Country struct { gorm.Model Name string Population int64 Regions []Region } type Region struct { gorm.Model Name string Cities []City CountryID uint `sql:"type:bigint REFERENCES countries(id) ON DELETE CASCADE" json:"-"` } type City struct { gorm.Model Name string Comment string RegionID uint `sql:"type:bigint REFERENCES regions(id) ON DELETE CASCADE" json:"-"` } When I create a new record from model, I invoke

问题 Original Question When using the Update method in GORM the new data does not get saved. i.e. I want to set a bool from true to false , but it stays true even after the Update method. In the description of the method there is a warning: "WARNING when update with struct, GORM will not update fields that with zero value" Since I am using a struct to update and false is the zero value of bool , this seems expected behaviour, but I don't see any reason why to do so and how to overcome this. func

问题 Original Question When using the Update method in GORM the new data does not get saved. i.e. I want to set a bool from true to false , but it stays true even after the Update method. In the description of the method there is a warning: "WARNING when update with struct, GORM will not update fields that with zero value" Since I am using a struct to update and false is the zero value of bool , this seems expected behaviour, but I don't see any reason why to do so and how to overcome this. func

问题 I am using gorm to interact with a postgres database. I'm trying to ORDER BY a query that uses DISTINCT ON and this question documents how it's not that easy to do that. So I need to end up with a query in the form of SELECT * FROM (<subquery>) ORDER BY column; At first glance it looks like I need to use db.QueryExpr() to turn the query I have into an expression and build another query around it. However it doesn't seem gorm has an easy way to directly specify the FROM clause. I tried using

问题 I have 2 structs with data like this: type User struct { Pics Pic[] } type Pic struct { Id int UserId int64 } Although everytime I insert an User, Each of the pics are inserted on their table everytime I find the users, pics are not populated: var users []User db.Limit(pagesize).Where("updated_at > ?", date).Find(&users) Am I doing something wrong? 回答1: Your models (the structs) don't really make sense because User have a Pic array indicates a 'one to many' user to pics relationship however

问题 I'm able to preload all Guests related to Order using this syntax: Table(order). Preload("Guests"). Where("order.code = ?", orderCode). First(&order). Error Is it possible to to preload Guests based on a condition on a column in Order table? here is SQL for what I want to achieve: SELECT * FROM orders WHERE code = "xyz" SELECT * FROM guests WHERE (order_id IN (1)) AND (some_column_in_guest_tbl = some_column_in_order_tbl) Note: I'm aware of this Preload syntax (this doesn't take value from

问题 I use Golang and GORM. I have a User structure which has one Association . type User struct { ID int ... } type Association struct { ID int UserID int } I also have an AssoUser structure, which is composed of a anonymous field User , and has a pointer to Assocation . type AssoUser struct { User Asso *Association } When I run var assoUser AssoUser assoUser.Asso = &Association{ Name : "asso_name", ... } assoUser.Name = "user_name" ... // filling the struct db.Debug().Create(&assoUser) I expect

问题 I have a query that fetches rows from jobs table and its author (each job has an author ), but I want to select specific fields. type User struct { ID uint `gorm:"primarykey" json:"-"` UUID uuid.UUID `gorm:"type:uuid not null" json:"-"` Email string `gorm:"type:varchar(255); not null" json:"email"` Name string `gorm:"type:varchar(255); not null" json:"name"` AvatarURL string `gorm:"type:varchar(255); not null" json:"avatar_url"` Provider string `gorm:"type:varchar(255); not null" json:

问题 I'm using gorm with postgres in my Go app. I want to create a new user in the database, but there is a good chance that that user will already exist. If so, I want to not do anything with the database, but I want know about it so I can tell the user. The good news is, that's already what gorm.Create(..) does. Trying to create a record with a duplicate unique key will return an error. There are two problems: I want better error messages. I want to write custom user-facing error messages that

问题 I have the following model... type User struct { ID string `sql:"type:uuid;primary_key;default:uuid_generate_v4()"` FirstName string `form:"first_name" json:"first_name,omitempty"` LastName string `form:"last_name" json:"last_name,omitempty"` Password string `form:"password" json:"password" bindind:"required"` Email string `gorm:"type:varchar(110);unique_index" form:"email" json:"email,omitempty" binding:"required"` Location string `form:"location" json:"location,omitempty"` Avatar string