Is there a way for me to retrieve the data object using the combined query method, findAll()?

Question

Is there a way for me to retrieve the data object using the combined query method, findAll()?

Can someone assist with my request? I have a code snippet below:

getData = async (req: Request, res: Response) => {
    try {
      const data = await FirstModel.findOne({
        where: { id: req.params.id },
        include: [
          {
            model: SecondModel,
            as: 'secondModel',
          },
          {
            model: ThirdModel,
            as: 'thirdModel',
          }
        ],
      });
      res.json(data);
    } catch (err) {
      console.error(err);
      return res.status(500).json({ error: err.message });
    }
  }

I am trying to add another piece of data for the fourth model in the object. Here is an example:

data.fourthModel = FourthModel.findAll();

However, I encountered an error message stating:

Property 'fourthModel' does not exist on type 'FirstModel'

.

In addition, I attempted to include one more connection, but it seems that the fourth model is not related to the first.

The desired output should be an object like this:

{
  id: 1,
  secondModel: {},
  thirdModel: {},
  fourthModel : {}
}

Any help or guidance would be greatly appreciated!

database typescript postgresql sequelize.js

Answer 1

Answer №1

If the entities are not directly connected, you will need to handle the outcomes for each query individually. To do this efficiently, you can utilize Promise.all(). Make use of Model.findByPk(id, options) when looking for a specific row by its primary key.

fetchData = async (req: Request, res: Response) => {
  try {
    // Retrieve data from the first entity (including secondary and tertiary entities)
    // as well as the fourth entity/entities concurrently; take note of the name of the fourth entity/entities
    // which is fetched using findAll() method and stored in an array of results
    const [ firstEntity, fourthEntities ] = await Promise.all([
      // create a promise for firstEntity linked to the second and third entities
      FirstEntity.findByPk(req.params.id, {
        include: [
          {
            model: SecondEntity,
            as: 'secondEntity',
          },
          {
            model: ThirdEntity,
            as: 'thirdEntity',
          },
        ],
      }),
      // create a promise for fetching fourth entity/entities
      FourthEntity.findall(),
    ]);
    // extract specific properties from the first entity
    const { id, secondEntity, thirdEntity } = firstEntity;
    // construct a data object
    const data = {
      id, secondEntity, thirdEntity, fourthEntities,
    };
    // send the data back
    return res.json(data);
  } catch (err) {
    console.error(err);
    return res.status(500).json({ error: err.message });
  }
};

Answer 2

If the entities are not directly connected, you will need to handle the outcomes for each query individually. To do this efficiently, you can utilize Promise.all(). Make use of Model.findByPk(id, options) when looking for a specific row by its primary key.

fetchData = async (req: Request, res: Response) => {
  try {
    // Retrieve data from the first entity (including secondary and tertiary entities)
    // as well as the fourth entity/entities concurrently; take note of the name of the fourth entity/entities
    // which is fetched using findAll() method and stored in an array of results
    const [ firstEntity, fourthEntities ] = await Promise.all([
      // create a promise for firstEntity linked to the second and third entities
      FirstEntity.findByPk(req.params.id, {
        include: [
          {
            model: SecondEntity,
            as: 'secondEntity',
          },
          {
            model: ThirdEntity,
            as: 'thirdEntity',
          },
        ],
      }),
      // create a promise for fetching fourth entity/entities
      FourthEntity.findall(),
    ]);
    // extract specific properties from the first entity
    const { id, secondEntity, thirdEntity } = firstEntity;
    // construct a data object
    const data = {
      id, secondEntity, thirdEntity, fourthEntities,
    };
    // send the data back
    return res.json(data);
  } catch (err) {
    console.error(err);
    return res.status(500).json({ error: err.message });
  }
};

Is there a way for me to retrieve the data object using the combined query method, findAll()?

Answer №1

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Is there a way for me to retrieve the data object using the combined query method, findAll()?

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