与续集的关联

Question

I am new to node js, I have a problem trying to get records from two related tables: Province and City.

A city has many provinces (this is my relationship)

I use this method to make the query:

async function getProvinces ()
   {
     return await municipality.findAll ({
       include: [{
           model: city,
           required: true,
           attributes: [['name', 'city']]
       }],
       attributes: ['provinceId', 'name']
     })
   }

and this returns me:

[{"provinceId": 1, "name": "province 1", "city": {"city": "city 1"}}]

My problem is the following:

when trying to access the city object I get an undefined

data [0].city.city

Why this??

what I need is to return a response with this format:

{"provinceId": 1, "name": "province 1", "city": "city 1"}

Update (Example)

const getProvincesMethod= async ()=>
{
  const value = await getProvinces()

  if(!value) return null

  var list = []

  value.forEach(item => {
    list.push(getProvinceObject(item))
  });

  return list
}

function getProvinceObject(data)
{
  if(!data) return null
  console.log(data)
  return {
    provinceId: data.provinceId,
    name: data.name,
    city: data.city.city
  }
}

async function getProvinces ()
   {
     return await municipality.findAll ({
       include: [{
           model: city,
           required: true,
           attributes: [['name', 'city']]
       }],
       attributes: ['provinceId', 'name']
     })
   }

Answer 1

You can access city as follows -

data[0].dataValues.city.dataValues.city

Hope it helps!