The action you're trying to perform (unnamed) can't be performed yet

Hi! I Just discover this project and it’s amazing! 🥇

I have several question about implementation to my project. So, I have function like this:

export async function asyncSaveOfflineDb (...) {
  // get watermelon database name from Repo databaseName
  // use it for db transaction
  const dbConv = getDatabaseName(databaseName)
  if (dbConv) {
    // get collection based on dbName
    const collection = database.collections.get(dbConv)

    try {
      // do watermelon database action
      await database.action(async () => {
        // Get data from DB. If no data saved yet, willUpdateData will be empty / null.
        const willUpdateData = await collection.query(
          Q.where('id', '' + rawData.id)
        ).fetch()

        // if willUpdateData is null, means data not in local DB
        // So create new DB based on raw data.
        if (!willUpdateData || willUpdateData.length === 0) {
          const newData = await collection.create(data => {
            // this allow us to passing data instead off declaring variable one by one.
            // pass all data to selectNormalize function,
            // and function will return data that suitable with the schema.
            data._raw = sanitizedRaw(selectNormalize(..., rawData), collection.schema)
          })
          console.log('CREATED data', newData, rawData)
        } else {
          // if willUpdateData is not empty, UPDATE THE DATA
          await willUpdateData[0].update(data => {
            data._raw = sanitizedRaw(selectNormalize(..., rawData), collection.schema)
          })
          console.log('UPDATED Data', willUpdateData, rawData)
        }
      })
    } catch (err) {
      console.log('ERORR UPDATE DATA', err, rawData)
      throw err
    }
  } else {
    console.log('DB not found or registered', databaseName)
  }
}

After several time trying, i got this warning message:

And when i build release for iOS, my app will stuck (not responding). Is this related with the warning?

Here is the first line error trace:

2019-01-11 15:27:24.265631+0800 rn_travlr[659:31471] Task <C86AB59B-8B96-4F93-8116-0910C3CCE8C3>.<57> finished with error - code: -999
2019-01-11 15:27:25.381613+0800 rn_travlr[659:31471] -[__NSCFNumber length]: unrecognized selector sent to instance 0xb0001683bcef4c53
2019-01-11 15:27:25.383 [fatal][tid:com.facebook.react.AsyncLocalStorageQueue] Exception '-[__NSCFNumber length]: unrecognized selector sent to instance 0xb0001683bcef4c53' was thrown while invoking multiSet on target AsyncLocalStorage with params (
        (
                (
            lastSync,
            1547191645381
        )
    ),
    24003
)

Also, I have a question about multithreading. Is it multithreaded in React Native? Thanks!

[andrewlorenz]

its hard to see how not enabling actions (assuming that actionsEnabled does indeed do what it says it does!) would fix a problem with performing an action. Its also apparently mandatory to set actionsEnabled when initialising the database connection, so I’m now struggling to resolve the same error as the OP

[radex]

And when i build release for iOS, my app will stuck (not responding). Is this related with the warning?

It is. The warning explains why the app appears stuck. Take a look at the docs: https://github.com/Nozbe/WatermelonDB/blob/master/docs/Actions.md

Also, I have a question about multithreading. Is it multithreaded in React Native? Thanks!

Yes. Native database code runs in a separate thread from JS thread and main thread.