entc/gen: add edge-field api for schema and codegen (#1213)

examples/o2m2types/ent/pet/pet.go

@@ -13,10 +13,8 @@ const (
 	FieldID = "id"
 	// FieldName holds the string denoting the name field in the database.
 	FieldName = "name"
-
 	// EdgeOwner holds the string denoting the owner edge name in mutations.
 	EdgeOwner = "owner"
-
 	// Table holds the table name of the pet in the database.
 	Table = "pets"
 	// OwnerTable is the table the holds the owner relation/edge.
@@ -34,7 +32,8 @@ var Columns = []string{
 	FieldName,
 }
 
-// ForeignKeys holds the SQL foreign-keys that are owned by the Pet type.
+// ForeignKeys holds the SQL foreign-keys that are owned by the "pets"
+// table and are not defined as standalone fields in the schema.
 var ForeignKeys = []string{
 	"user_pets",
 }

examples/o2m2types/ent/pet_create.go

@@ -155,6 +155,7 @@ func (pc *PetCreate) createSpec() (*Pet, *sqlgraph.CreateSpec) {
 		for _, k := range nodes {
 			edge.Target.Nodes = append(edge.Target.Nodes, k)
 		}
+		_node.user_pets = &nodes[0]
 		_spec.Edges = append(_spec.Edges, edge)
 	}
 	return _node, _spec

examples/o2m2types/ent/user/user.go

@@ -15,10 +15,8 @@ const (
 	FieldAge = "age"
 	// FieldName holds the string denoting the name field in the database.
 	FieldName = "name"
-
 	// EdgePets holds the string denoting the pets edge name in mutations.
 	EdgePets = "pets"
-
 	// Table holds the table name of the user in the database.
 	Table = "users"
 	// PetsTable is the table the holds the pets relation/edge.