forked from ent/contrib
/
index.go
67 lines (61 loc) · 1.78 KB
/
index.go
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// Copyright 2019-present Facebook
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package schemast
import (
"go/ast"
"entgo.io/ent"
"entgo.io/ent/schema/index"
)
// Index converts an *index.Descriptor back into an *ast.CallExpr
// of the ent Index package that can be used to construct it.
func Index(desc *index.Descriptor) (*ast.CallExpr, error) {
idx := newIndexCall(desc)
if desc.Unique {
idx.method("Unique")
}
if desc.StorageKey != "" {
idx.method("StorageKey", strLit(desc.StorageKey))
}
if len(desc.Edges) > 0 {
var edges []ast.Expr
for _, e := range desc.Edges {
edges = append(edges, strLit(e))
}
idx.method("Edges", edges...)
}
return idx.curr, nil
}
// AppendIndex adds an index to the returned values of the Indexes method of type typeName.
func (c *Context) AppendIndex(typeName string, idx ent.Index) error {
newIdx, err := Index(idx.Descriptor())
if err != nil {
return err
}
return c.appendReturnItem(kindIndex, typeName, newIdx)
}
func newIndexCall(desc *index.Descriptor) *builderCall {
var fields []ast.Expr
for _, fld := range desc.Fields {
fields = append(fields, strLit(fld))
}
return &builderCall{
curr: &ast.CallExpr{
Fun: &ast.SelectorExpr{
X: ast.NewIdent("index"),
Sel: ast.NewIdent("Fields"),
},
Args: fields,
},
}
}