ent/doc/md/predicates.md

id, title

id	title
predicates	Predicates

Field Predicates

• Bool:
  • =, !=
• Numeric:
  • =, !=, >, <, >=, <=,
  • IN, NOT IN
• Time:
  • =, !=, >, <, >=, <=
  • IN, NOT IN
• String:
  • =, !=, >, <, >=, <=
  • IN, NOT IN
  • Contains, HasPrefix, HasSuffix
  • ContainsFold, EqualFold (SQL specific)
• Optional fields:
  • IsNil, NotNil

Edge Predicates

• HasEdge. For example, for edge named owner of type Pet, use:

   client.Pet.
    	Query().
    	Where(user.HasOwner()).
    	All(ctx)
  

• HasEdgeWith. Add list of predicates for edge predicate.

   client.Pet.
    	Query().
    	Where(user.HasOwnerWith(user.Name("a8m"))).
    	All(ctx)
  

Negation (NOT)

client.Pet.
	Query().
	Where(user.Not(user.NameHasPrefix("Ari"))).
	All(ctx)

Disjunction (OR)

client.Pet.
	Query().
	Where(
		user.Or(
			user.HasOwner(),
			user.Not(user.HasFriends()),
		)
	).
	All(ctx)

Conjunction (AND)

client.Pet.
	Query().
	Where(
		user.And(
			user.HasOwner(),
			user.Not(user.HasFriends()),
		)
	).
	All(ctx)

Custom Predicates

Custom predicates can be useful if you want to write your own dialect-specific logic.

pets := client.Pet.
	Query().
	Where(predicate.Pet(func(s *sql.Selector) {
		s.Where(sql.InInts(pet.OwnerColumn, 1, 2, 3))
	})).
	AllX(ctx)