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// Copyright 2019-present Facebook Inc. All rights reserved.
// This source code is licensed under the Apache 2.0 license found
// in the LICENSE file in the root directory of this source tree.
package index
// A Descriptor for index configuration.
type Descriptor struct {
Unique bool // unique index.
Edges []string // edge columns.
Fields []string // field columns.
StorageKey string // custom index name.
}
// Builder for indexes on vertex columns and edges in the graph.
type Builder struct {
desc *Descriptor
}
// Fields creates an index on the given vertex fields.
// Note that indexes are implemented only for SQL dialects, and does not support gremlin.
//
// func (T) Indexes() []ent.Index {
//
// // Unique index on 2 fields.
// index.Fields("first", "last").
// Unique(),
//
// // Unique index of field under specific edge.
// index.Fields("name").
// FromEdges("parent").
// Unique(),
//
// }
//
func Fields(fields ...string) *Builder {
return &Builder{desc: &Descriptor{Fields: fields}}
}
// Edges creates an index on the given vertex edge fields.
// Note that indexes are implemented only for SQL dialects, and does not support gremlin.
//
// func (T) Indexes() []ent.Index {
//
// // Unique index of field under 2 edges.
// index.Field("name").
// Edges("parent", "type").
// Unique(),
//
// }
//
func Edges(edges ...string) *Builder {
return &Builder{desc: &Descriptor{Edges: edges}}
}
// Fields sets the fields of the index.
//
// func (T) Indexes() []ent.Index {
//
// // Unique "name" and "age" fields under the "parent" edge.
// index.Edges("parent").
// Fields("name", "age").
// Unique(),
//
// }
func (b *Builder) Fields(fields ...string) *Builder {
b.desc.Fields = fields
return b
}
// Edges sets the fields index to be unique under the set of edges (sub-graph). For example:
//
// func (T) Indexes() []ent.Index {
//
// // Unique "name" field under the "parent" edge.
// index.Fields("name").
// Edges("parent").
// Unique(),
// }
//
func (b *Builder) Edges(edges ...string) *Builder {
b.desc.Edges = edges
return b
}
// Unique sets the index to be a unique index.
// Note that defining a uniqueness on optional fields won't prevent
// duplicates if one of the column contains NULL values.
func (b *Builder) Unique() *Builder {
b.desc.Unique = true
return b
}
// StorageKey sets the storage key of the index. In SQL dialects, it's the index name.
func (b *Builder) StorageKey(key string) *Builder {
b.desc.StorageKey = key
return b
}
// Descriptor implements the ent.Descriptor interface.
func (b *Builder) Descriptor() *Descriptor {
return b.desc
}
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