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add_fields.go
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add_fields.go
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// Copyright 2021 FerretDB Inc.
//
// 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 stages
import (
"context"
"fmt"
"github.com/FerretDB/FerretDB/internal/handlers/common"
"github.com/FerretDB/FerretDB/internal/handlers/common/aggregations"
"github.com/FerretDB/FerretDB/internal/handlers/commonerrors"
"github.com/FerretDB/FerretDB/internal/types"
"github.com/FerretDB/FerretDB/internal/util/iterator"
"github.com/FerretDB/FerretDB/internal/util/lazyerrors"
)
// addFields represents $addFields stage.
//
// { $addFields: { <newField>: <expression>, ... } }
type addFields struct {
newField *types.Document
}
// newAddFields validates stage document and creates a new $addFields stage.
func newAddFields(stage *types.Document) (aggregations.Stage, error) {
fields, err := stage.Get("$addFields")
if err != nil {
return nil, lazyerrors.Error(err)
}
fieldsDoc, ok := fields.(*types.Document)
if !ok {
return nil, commonerrors.NewCommandErrorMsgWithArgument(
commonerrors.ErrSetBadExpression,
fmt.Sprintf("$addFields specification stage must be an object, got %T", fields),
"$addFields (stage)",
)
}
if err := validateFieldPath("$addFields", fieldsDoc); err != nil {
return nil, err
}
if err := validateExpression("$addFields", fieldsDoc); err != nil {
return nil, err
}
return &addFields{
newField: fieldsDoc,
}, nil
}
// Process implements Stage interface.
func (s *addFields) Process(_ context.Context, iter types.DocumentsIterator, closer *iterator.MultiCloser) (types.DocumentsIterator, error) { //nolint:lll // for readability
return common.AddFieldsIterator(iter, closer, s.newField), nil
}
// check interfaces
var (
_ aggregations.Stage = (*addFields)(nil)
)