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mongox-go-driver/mongox/database/loadstream.go

36 lines
828 B

package database
import (
"fmt"
"github.com/mainnika/mongox-go-driver/v2/mongox"
"github.com/mainnika/mongox-go-driver/v2/mongox/query"
)
// LoadStream function loads documents one by one into a target channel
func (d *Database) LoadStream(target interface{}, filters ...interface{}) (loader mongox.StreamLoader, err error) {
composed, err := query.Compose(filters...)
if err != nil {
return
}
_, hasPreloader := composed.Preloader()
ctx := query.WithContext(d.Context(), composed)
var cursor *mongox.Cursor
if hasPreloader {
cursor, err = d.createAggregateLoad(target, composed)
} else {
cursor, err = d.createSimpleLoad(target, composed)
}
if err != nil {
err = fmt.Errorf("can't create find result: %w", err)
return
}
loader = &StreamLoader{cur: cursor, ctx: ctx, query: composed}
return
}