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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 String The name of the numeric attribute to be summed.
2 criteria Dictionary? 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
Number The aggregate sum of the specified attribute across all matching records.
Errors
#
Name Type When?
UsageError Error Thrown if something invalid was passed in.
AdapterError Error Thrown if something went wrong in the database adapter.
Error 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

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  • 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.

Reference

Reference