insert then delete doesn't work, delete then insert does work

[knex]

insert then delete doesn't work, delete then insert does work

[tgriesser]

@neilk they're not quite the same... in the second example, deleteTile is called immediately, it either needs to return a function, or the then needs to take an anonymous function:

function deleteTile(tile) {
  return function() {
    return db('tilestofetch').where(tile).delete();
  };
}

or:

createTile()
  .then(function() {
     return deleteTile(tile)
  })

(I'm not sure if that is the issue, but it might be part of it).

[neilk]

Ah. I guess I thought then() was smart enough to recognize another promise. Thanks!

[tgriesser]

@neilk - it is, but in this case you're invoking it immediately... effectively turning it into a value rather than a handler function.

[neilk]

Now I'm confused again. What makes db('tilestofetch').where(tile).delete() invoke immediately, without .exec() or .then() ?

[tgriesser]

Sorry, I didn't mean that it'd invoke immediately, it's just that it's just an object, not a function, and the onFulfilled has to be a function (spec)... so if you returned a value from that function with a then method that hasn't been called yet it'd be coerced into a promise, but otherwise just tossing an object that could turn into promise into the onFulfilled slot wouldn't be expected behavior.