Hi,
I am running into an issue trying to run multiple findOrCreate methods in
parallel.
Here is the code:
var findOrCreate = exports.findOrCreate = function (data, callback) {
if (!data.source) {
return callback(new ParamError('Missing account.source.'));
}
if (!data.external_id) {
return callback(new ParamError('Missing account.external_id'));
}
Account.findOne({
source: data.source,
external_id: data.external_id
}, function (err, account) {
if (err) {
return callback(err);
}
if (account) {
return callback(err, account);
}
account = new Account(data);
account.save(function (err) {
return callback(err, account);
});
});
};
The issue is that I may have multiple queries for the same
source/external_id combo. I am using async.parallel to handle them. But
since the callbacks in mongoose are pushed onto the next tick, I end up in
a situation where
1. a find is performed (pushing the create to the next tick)
2. another find is performed for the same source/external_id (pushing
the create to the next tick)
3. a create is performed (for the first find)
4. an attempt is made to create again, but this time a duplicate key
error is thrown (since I already created that account)
I originally tried to get around this by doing an upsert instead of find or
create, but that didn't work since I need access the the resulting item. I
am not sure what the best way to handle this scenario is. any ideas?
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