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doc/faq: minor changes for default-func

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This commit is contained in:
Ariel Mashraki
2021-01-10 14:15:50 +02:00
committed by Ariel Mashraki
parent e4cc63c411
commit e62e5c26be
2 changed files with 8 additions and 9 deletions
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9
doc/md/faq.md
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@@ -13,7 +13,7 @@ sidebar_label: FAQ
[How to add custom predicates to the codegen assets?](#how-to-add-custom-predicates-to-the-codegen-assets) \ [How to add custom predicates to the codegen assets?](#how-to-add-custom-predicates-to-the-codegen-assets) \
[How to define a network address field in PostgreSQL?](#how-to-define-a-network-address-field-in-postgresql) \ [How to define a network address field in PostgreSQL?](#how-to-define-a-network-address-field-in-postgresql) \
[How to customize time fields to type `DATETIME` in MySQL?](#how-to-customize-time-fields-to-type-datetime-in-mysql) \ [How to customize time fields to type `DATETIME` in MySQL?](#how-to-customize-time-fields-to-type-datetime-in-mysql) \
[How do I use a custom generator of IDs?](#how-do-i-use-a-custom-generator-of-ids) [How to use a custom generator of IDs?](#how-to-use-a-custom-generator-of-ids)
## Answers ## Answers
@@ -319,7 +319,7 @@ field.Time("birth_date").
}), }),
``` ```
#### How do I use a custom generator of IDs? #### How to use a custom generator of IDs?
If you're using a custom ID generator instead of using auto-incrementing IDs in If you're using a custom ID generator instead of using auto-incrementing IDs in
your database (e.g. Twitter's [Snowflake](https://github.com/twitter-archive/snowflake/tree/snowflake-2010)), your database (e.g. Twitter's [Snowflake](https://github.com/twitter-archive/snowflake/tree/snowflake-2010)),
@@ -341,21 +341,22 @@ type BaseMixin struct {
mixin.Schema mixin.Schema
} }
// Fields of the Mixin.
func (BaseMixin) Fields() []ent.Field { func (BaseMixin) Fields() []ent.Field {
return []ent.Field{ return []ent.Field{
field.Uint64("id"), field.Uint64("id"),
} }
} }
// Hooks of the Mixin.
func (BaseMixin) Hooks() []ent.Hook { func (BaseMixin) Hooks() []ent.Hook {
return []ent.Hook{ return []ent.Hook{
hook.On(IDHook(), ent.OpCreate), hook.On(IDHook(), ent.OpCreate),
} }
} }
var sf = sonyflake.NewSonyflake(sonyflage.Settings{})
func IDHook() ent.Hook { func IDHook() ent.Hook {
sf := sonyflake.NewSonyflake(sonyflage.Settings{})
type IDSetter interface { type IDSetter interface {
SetID(uint64) SetID(uint64)
} }

8
doc/md/schema-fields.md
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@@ -149,14 +149,12 @@ to specify a function which will always be ran when the resource is created.
See the [related FAQ](faq.md#how-do-i-use-a-custom-generator-of-ids) for more information. See the [related FAQ](faq.md#how-do-i-use-a-custom-generator-of-ids) for more information.
```go ```go
var globalIDCounter int64 = 0
// Fields of the User. // Fields of the User.
func (User) Fields() []ent.Field { func (User) Fields() []ent.Field {
return []ent.Field{ return []ent.Field{
field.Int64("id"). field.Int64("id").
DefaultFunc(func() int64 { DefaultFunc(func() int64 {
// example of a dumb ID generator - use a production-ready alternative instead // An example of a dumb ID generator - use a production-ready alternative instead.
return time.Now().Unix() << 8 | atomic.AddInt64(&counter, 1) % 256 return time.Now().Unix() << 8 | atomic.AddInt64(&counter, 1) % 256
}), }),
} }
@@ -261,8 +259,8 @@ func (User) Fields() []ent.Field {
} }
``` ```
In case your `DefaultFunc` is also returning an error, it is better if it is In case your `DefaultFunc` is also returning an error, it is better to handle it properly using [schema-hooks](hooks.md#schema-hooks).
handled properly. [See this FAQ.](faq.md#how-do-i-use-a-custom-generator-of-ids) See [this FAQ](faq.md#how-to-use-a-custom-generator-of-ids) for more information.
## Validators ## Validators