Implementing conditional evaluations in ORM (sequelizejs) queries

Question

Implementing conditional evaluations in ORM (sequelizejs) queries

Let's imagine a scenario where I have a table called gameData {gameId, currentBoardLayout}. A GET request is sent to the server at www.chess.com/asd123, with "asd123" being the game id. In order to handle this situation, I will need to extract this id (asd123) and search for it in my table (gameData). Once found, the following logic should be implemented:

srv.get('/:id', (req, res) => {
    if ( gameData.findAll({where: {gameId: req.params.id} )
            { // Game room found
                return currentBoardLayout
            }
    else
            { error : Invalid game id }
    })

Can anyone guide me on how to go about achieving this? Thanks!

javascript express sequelize.js

Answer 1

Answer №1

If you need to retrieve data by ID, Sequelize offers a convenient method called findById.

srv.get('/:id', (req, res) => {
  gameData.findById(req.params.id)
    .then(result => {
      res.send(result)
    })
    .catch(() => {
      res.send({
        error: 'Could not find ID'
      })
    })
})

Here's a breakdown of the process:

The findById method in Sequelize will return a promise. If successful, the requested item from the database will be returned. If the item is not found, the catch block will handle it.
res.send is Express' way of sending data back to the client.

For more information, make sure to explore the following resources in the Sequelize documentation:

Answer 2

If you need to retrieve data by ID, Sequelize offers a convenient method called findById.

srv.get('/:id', (req, res) => {
  gameData.findById(req.params.id)
    .then(result => {
      res.send(result)
    })
    .catch(() => {
      res.send({
        error: 'Could not find ID'
      })
    })
})

Here's a breakdown of the process:

The findById method in Sequelize will return a promise. If successful, the requested item from the database will be returned. If the item is not found, the catch block will handle it.
res.send is Express' way of sending data back to the client.

For more information, make sure to explore the following resources in the Sequelize documentation:

Implementing conditional evaluations in ORM (sequelizejs) queries

Answer №1

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