ent

Documentation

Overview

ent tool generates the datastore access logics and validations for your datastore entities.

//go:generate -type=MyEnt
type MyEnt struct {
   // pubic fields here
}

then `go generate` command will generate my_ent_datastore.go with `MyEntKind` type and `MyEntQuery“ type that implements the datastore access logics.

Some logics can be configured by using field tags in a model.

1. ent tag

type MyEnt struct {
    ID        `ent:"id""`
    UpdatedAt `ent:"timestamp"`
}

ent tag has some attributes:

• 'id': used for the key in the datastore
• 'timestamp': automatically updated when kind puts the entity.
• 'form': indicates the field an be collected via {Type}Kind.FromForm function.

2. default tag.

type MyEnt struct {
    ID        `ent:"id""`
    Title     `default:"*Untitled*"`
    UpdatedAt `ent:"timestamp"`
}

default tag is a tag to configure default values of the instance created by {ModelName}.New() function. In the example above, `MyEnt.New()` would return the instance with the '*Untitled*' value of it's Title field.