什么是上下文？为什么在odoo中使用？

Question

odoo中的上下文是什么意思？请举例说明

def change_product_qty(self, cr, uid, ids, context=None): 
    """ Changes the Product Quantity by making a Physical Inventory. """ 
    if context is None: 
     context = {} 

    inventory_obj = self.pool.get('stock.inventory') 
    inventory_line_obj = self.pool.get('stock.inventory.line') 

    for data in self.browse(cr, uid, ids, context=context): 
     if data.new_quantity < 0: 
      raise UserError(_('Quantity cannot be negative.')) 
     ctx = context.copy() 
     ctx['location'] = data.location_id.id 
     ctx['lot_id'] = data.lot_id.id 
     if data.product_id.id and data.lot_id.id: 
      filter = 'none' 
     elif data.product_id.id: 
      filter = 'product' 
     else: 
      filter = 'none' 
     inventory_id = inventory_obj.create(cr, uid, { 
      'name': _('INV: %s') % tools.ustr(data.product_id.name), 
      'filter': filter, 
      'product_id': data.product_id.id, 
      'location_id': data.location_id.id, 
      'lot_id': data.lot_id.id}, context=context) 

     line_data = self._prepare_inventory_line(cr, uid, inventory_id, data, context=context) 

     inventory_line_obj.create(cr, uid, line_data, context=context) 
     inventory_obj.action_done(cr, uid, [inventory_id], context=context) 
    return {} 

Answer 1

上下文是字典，包含登录的用户ID，语言，时区以及可能添加的任何键值对。它意味着在模型和视图之间传递数据的手段。在Android中，它类似于在启动意图或活动时传递一组数据。