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84 lines
2.1 KiB
84 lines
2.1 KiB
/*
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Copyright 2020 The Qmgo Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package qmgo
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import (
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"context"
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opts "github.com/qiniu/qmgo/options"
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"go.mongodb.org/mongo-driver/mongo/options"
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"go.mongodb.org/mongo-driver/bson"
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"go.mongodb.org/mongo-driver/mongo"
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)
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// Pipeline define the pipeline for aggregate
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type Pipeline []bson.D
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// Aggregate is a handle to a aggregate
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type Aggregate struct {
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ctx context.Context
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pipeline interface{}
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collection *mongo.Collection
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options []opts.AggregateOptions
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}
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// All iterates the cursor from aggregate and decodes each document into results.
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func (a *Aggregate) All(results interface{}) error {
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opts := options.Aggregate()
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if len(a.options) > 0 {
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opts = a.options[0].AggregateOptions
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}
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c, err := a.collection.Aggregate(a.ctx, a.pipeline, opts)
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if err != nil {
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return err
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}
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return c.All(a.ctx, results)
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}
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// One iterates the cursor from aggregate and decodes current document into result.
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func (a *Aggregate) One(result interface{}) error {
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opts := options.Aggregate()
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if len(a.options) > 0 {
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opts = a.options[0].AggregateOptions
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}
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c, err := a.collection.Aggregate(a.ctx, a.pipeline, opts)
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if err != nil {
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return err
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}
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cr := Cursor{
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ctx: a.ctx,
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cursor: c,
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err: err,
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}
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defer cr.Close()
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if !cr.Next(result) {
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return ErrNoSuchDocuments
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}
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return err
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}
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// Iter return the cursor after aggregate
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func (a *Aggregate) Iter() CursorI {
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opts := options.Aggregate()
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if len(a.options) > 0 {
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opts = a.options[0].AggregateOptions
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}
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c, err := a.collection.Aggregate(a.ctx, a.pipeline, opts)
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return &Cursor{
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ctx: a.ctx,
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cursor: c,
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err: err,
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}
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}
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