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Reviewed By: alexsn Differential Revision: D17926144 fbshipit-source-id: 5390585bf634aecfad86a729db6e633c4a7e6f5e
93 lines
1.3 KiB
Markdown
Executable File
93 lines
1.3 KiB
Markdown
Executable File
---
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id: predicates
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title: Predicates
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---
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## Field Predicates
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- **Bool**:
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- =, !=
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- **Numeric**:
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- =, !=, >, <, >=, <=,
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- IN, NOT IN
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- **Time**:
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- =, !=, >, <, >=, <=
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- IN, NOT IN
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- **String**:
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- =, !=, >, <, >=, <=
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- IN, NOT IN
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- Contains, HasPrefix, HasSuffix
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- ContainsFold, EqualFold (**SQL** specific)
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- **Optional** fields:
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- IsNil, NotNil
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## Edge Predicates
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- **HasEdge**. For example, for edge named `owner` of type `Pet`, use:
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```go
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client.Pet.
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Query().
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Where(user.HasOwner()).
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All(ctx)
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```
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- **HasEdgeWith**. Add list of predicates for edge predicate.
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```go
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client.Pet.
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Query().
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Where(user.HasOwnerWith(user.Name("a8m"))).
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All(ctx)
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```
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## Negation (NOT)
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```go
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client.Pet.
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Query().
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Where(user.Not(user.NameHasPrefix("Ari"))).
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All(ctx)
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```
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## Disjunction (OR)
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```go
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client.Pet.
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Query().
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Where(
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user.Or(
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user.HasOwner(),
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user.Not(user.HasFriends()),
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)
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).
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All(ctx)
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```
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## Conjunction (AND)
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```go
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client.Pet.
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Query().
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Where(
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user.And(
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user.HasOwner(),
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user.Not(user.HasFriends()),
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)
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).
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All(ctx)
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```
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## Custom Predicates
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Custom predicates can be useful if you want to write your own dialect-specific logic.
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```go
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pets := client.Pet.
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Query().
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Where(predicate.Pet(func(s *sql.Selector) {
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s.Where(sql.InInts(pet.OwnerColumn, 1, 2, 3))
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})).
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AllX(ctx)
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``` |