func (o *GetBackendsParams) bindTransactionID(rawData []string, hasKey bool, formats strfmt.Registry) error {
	var raw string
	if len(rawData) > 0 {
		raw = rawData[len(rawData)-1]
	}
	if raw == "" {  
		return nil
	}
	o.TransactionID = &raw
	return nil
}
bindTransactionID binds and validates parameter TransactionID from query.
package backend
import (
	"net/http"
	"github.com/go-openapi/errors"
	"github.com/go-openapi/runtime"
	"github.com/go-openapi/runtime/middleware"
	"github.com/go-openapi/strfmt"
)
func NewGetBackendsParams() GetBackendsParams {
	return GetBackendsParams{}
}
type GetBackendsParams struct {
	HTTPRequest *http.Request `json:"-"`
	TransactionID *string
}
func (o *GetBackendsParams) BindRequest(r *http.Request, route *middleware.MatchedRoute) error {
	var res []error
	o.HTTPRequest = r
	qs := runtime.Values(r.URL.Query())
	qTransactionID, qhkTransactionID, _ := qs.GetOK("transaction_id")
	if err := o.bindTransactionID(qTransactionID, qhkTransactionID, route.Formats); err != nil {
		res = append(res, err)
	}
	if len(res) > 0 {
		return errors.CompositeValidationError(res...)
	}
	return nil
}