Question

我试图放入一个嵌套模型，并且可以使用，但是我可以看到同时创建的数据库中的新行。

api / program.py：

@app.route("/programs/<id>", methods=["PUT"])
def update_program(id):
  program = Program.query.filter_by(id=id).first()
  res = program_nested_schema.load(request.json)

  program.name = res.data.name
  program.steps = res.data.steps
  program.updated_at = datetime.utcnow()

  db.session.add(program)
  db.session.commit()

  return program_nested_schema.jsonify(program)

（我认为这是我的嵌套模式存在的问题）

方案：

class ProgramNested(ma.ModelSchema):
class Meta:
    model = Program
    fields = ('name', 'visibility', 'steps')
  steps = fields.Nested(ProgramStepsSchema, many=True)

program_nested_schema = ProgramNested()

class ProgramStepsSchema(ma.ModelSchema):
  class Meta:
    model = Step
  exercise = fields.Nested(GetExerciseSchema, many=False, only=('id',))

class GetExerciseSchema(ma.ModelSchema):
  class Meta:
    model = Exercise
    fields = ('id', 'name', 'image', 'visibility')

除了更新之外，我发送此正文时还会创建一行：

{
"id": 2,
"name": "Jambes",
"steps": [
    {
        "exercise": {
            "id": 6,
            "image": "pompe.jpg",
            "name": "Pompes"
        },
        "id": 6,
        "position": 1,
        "repetitions": 200,
        "rest": 30,
        "rest_end": 60,
        "series": 3,
        "weight": 0
    },
    {
        "exercise": {
            "id": 7,
            "image": "10763352.jpg",
            "name": "Squats"
        },
        "id": 70,
        "position": 2,
        "repetitions": 11,
        "rest": 45,
        "rest_end": 90,
        "series": 4,
        "weight": 16
    }
],
"visibility": "PRIVATE"
}

这是我的第一篇文章，如果您需要更多信息，请告诉我，我很抱歉我的英语水平

Sqlalchemy-当我将嵌套有棉花糖的模型放到

0 个答案: