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.sum()

Get the aggregate sum of the specified attribute across all matching records.

var total = await Something.sum(numericAttrName, criteria);

Usage

Argument Type Details
1 numericAttrName The name of the numeric attribute to be summed.
2 criteria The Waterline criteria to use for matching records in the database. If no criteria is specified, the sum will be computed across all of this model's records. sum queries do not support pagination using skip and limit or projections using select.
Result
Type Description
The aggregate sum of the specified attribute across all matching records.
Errors
Name Type When?
UsageError Thrown if something invalid was passed in.
AdapterError Thrown if something went wrong in the database adapter.
Error Thrown if anything else unexpected happens.

See Concepts > Models and ORM > Errors for examples of negotiating errors in Sails and Waterline.

Example

Get the cumulative account balance of all bank accounts that have less than $32,000 or are flagged as "suspended".

var total = await BankAccount.sum('balance')
.where({
  or: [
    { balance: { '<': 32000 } },
    { suspended: true }
  ]
});

Notes

  • This method can be used with await, promise chaining, or traditional Node callbacks.
  • Some databases, like MySQL, may return null for this kind of query; however, it's best practice for Sails/Waterline adapter authors to return 0 for consistency and type safety in app-level code.

Is something missing?

If you notice something we've missed or could be improved on, please follow this link and submit a pull request to the sails repo. Once we merge it, the changes will be reflected on the website the next time it is deployed.

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