counter方法计数不好

我有一个方法，告诉一个工人做了一次销售，但它不起作用，因为它只标记我他做了1，但实际上做了5。接下来，我留下了一个图像和用于指导我的代码。

**class Worker (models.Model):**

    _name = 'project_rc.worker'

    sales_counter = fields.Integer (string = "Sales made", compute = "get_sales_made")
    document_ids = fields.One2many (comodel_name = 'project_rc.document', 
    inverse_name = 'worker_id', string = 'Invoice')

def get_sales_made (self):

      count = self.env ['project_rc.type_movement']. search_count ([('type_movement', '=', 'sale')])

      self.counter_sale = count


**class Document (models.Model):**

    type_movement_id = fields.Many2one (comodel_name = 'project_rc.type_movement', string = "Movement type")

    worker_id = fields.Many2one (asdel_name = 'project_rc.worker', string = "Worker")

**class Type_Movement (models.Model):**

    type_movement = fields.Selection ([('purchase', 'Purchase'), ('sale', 'Sale'), ('merma', 'Merma')], string = "Movement type")

    document_ids = fields.One2many (comodel_name = 'project_rc.document', inverse_name = 'type_movimiento_id', string = 'Document')

示例图片：https://ibb.co/vs0dw5K

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