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68 lines
1.3 KiB
68 lines
1.3 KiB
package database
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import (
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"fmt"
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"github.com/mainnika/mongox-go-driver/v2/mongox"
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"github.com/mainnika/mongox-go-driver/v2/mongox/base"
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"github.com/mainnika/mongox-go-driver/v2/mongox/query"
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)
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// LoadOne function loads a first single target document by a query
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func (d *Database) LoadOne(target interface{}, filters ...interface{}) (err error) {
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composed := query.Compose(append(filters, query.Limit(1))...)
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hasPreloader, _ := composed.Preloader()
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ctx := query.WithContext(d.Context(), composed)
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var result *mongox.Cursor
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defer func() {
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if result != nil {
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closerr := result.Close(ctx)
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if err == nil {
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err = closerr
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}
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}
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invokerr := composed.OnClose().Invoke(ctx, target)
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if err == nil {
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err = invokerr
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}
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return
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}()
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if hasPreloader {
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result, err = d.createAggregateLoad(target, composed)
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} else {
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result, err = d.createSimpleLoad(target, composed)
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}
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if err != nil {
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return fmt.Errorf("can't create find result: %w", err)
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}
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hasNext := result.Next(ctx)
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if result.Err() != nil {
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err = result.Err()
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return
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}
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if !hasNext {
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return mongox.ErrNoDocuments
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}
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base.Reset(target)
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err = result.Decode(target)
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if err != nil {
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return
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}
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err = composed.OnDecode().Invoke(ctx, target)
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if err != nil {
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return
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}
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return
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}
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