我想将def get_trip_title(instance, filename):
# file will be uploaded to MEDIA_ROOT/reservations/title/<filename>
return 'reservations/{0}/{1}'.format(instance.trip_id.title, filename)
class TripPhoto(models.Model):
photo = models.FileField(upload_to=get_trip_title)
设置为具有特定结构的所有navParams或.setRoot()被调用。为此我想扩展.push()类，就像我能用Angular的NavController
我试过这个：
Http但它不起作用。这是因为是一个静态类？我怎样才能在import { Injectable } from '@angular/core';
import { NavController } from 'ionic-angular';
@Injectable()
export class NavigationProvider extends NavController {
constructor() {
super();
console.log('Hello NavigationProvider Provider');
}
}
？