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62 lines
1.4 KiB
62 lines
1.4 KiB
package common
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import (
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"context"
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"github.com/mainnika/mongox-go-driver/mongox"
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"github.com/mainnika/mongox-go-driver/mongox/errors"
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"github.com/mainnika/mongox-go-driver/mongox/query"
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"go.mongodb.org/mongo-driver/mongo"
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"go.mongodb.org/mongo-driver/mongo/options"
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)
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// ManyLoader is a controller for a database cursor
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type ManyLoader struct {
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*mongo.Cursor
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ctx context.Context
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target interface{}
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}
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// Get loads documents to a target or returns an error
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func (l *ManyLoader) Get() error {
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hasNext := l.Next(l.ctx)
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if !hasNext {
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return errors.NotFoundErrorf("%s", mongo.ErrNoDocuments)
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}
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err := l.Decode(l.target)
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if err != nil {
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return errors.InternalErrorf("can't decode desult: %s", err)
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}
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return nil
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}
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// Close cursor
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func (l *ManyLoader) Close() error {
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return l.Cursor.Close(l.ctx)
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}
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// LoadMany function loads documents one by one into a target channel
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func LoadMany(db *mongox.Database, target interface{}, filters ...interface{}) (*ManyLoader, error) {
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collection := db.GetCollectionOf(target)
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opts := options.Find()
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composed := query.Compose(filters...)
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opts.Sort = composed.Sorter()
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opts.Limit = composed.Limiter()
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opts.Skip = composed.Skipper()
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cursor, err := collection.Find(db.Context(), composed.M(), opts)
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if err != nil {
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return nil, errors.InternalErrorf("can't create find result: %s", err)
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}
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l := &ManyLoader{Cursor: cursor, ctx: db.Context(), target: target}
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return l, nil
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}
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