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mongox-go-driver/mongox/common/loadone.go

34 lines
914 B

package common
import (
"github.com/mainnika/mongox-go-driver/mongox"
"github.com/mainnika/mongox-go-driver/mongox/errors"
"github.com/mainnika/mongox-go-driver/mongox/query"
"go.mongodb.org/mongo-driver/mongo"
)
// LoadOne function loads a first single target document by a query
func LoadOne(db *mongox.Database, target interface{}, filters ...interface{}) error {
composed := query.Compose(append(filters, query.Limit(1))...)
hasPreloader, _ := composed.Preloader()
var result *mongo.Cursor
var err error
if hasPreloader {
result, err = createAggregateLoad(db, target, composed)
} else {
result, err = createSimpleLoad(db, target, composed)
}
if err != nil {
return errors.InternalErrorf("can't create find result: %s", err)
}
hasNext := result.Next(db.Context())
if !hasNext {
return errors.NotFoundErrorf("can't find result: %s", result.Err())
}
return result.Decode(target)
}