Automattic/mongoose · error · Error

Collection#findOne unimplemented by driver

Error message

Collection#findOne unimplemented by driver

What it means

Error "Collection#findOne unimplemented by driver" thrown in Automattic/mongoose.

Source

Thrown at lib/collection.js:192

Collection.prototype.findOneAndDelete = function() {
  throw new Error('Collection#findOneAndDelete unimplemented by driver');
};

/**
 * Abstract method that drivers must implement.
 */

Collection.prototype.findOneAndReplace = function() {
  throw new Error('Collection#findOneAndReplace unimplemented by driver');
};

/**
 * Abstract method that drivers must implement.
 */

Collection.prototype.findOne = function() {
  throw new Error('Collection#findOne unimplemented by driver');
};

/**
 * Abstract method that drivers must implement.
 */

Collection.prototype.find = function() {
  throw new Error('Collection#find unimplemented by driver');
};

/**
 * Abstract method that drivers must implement.
 */

Collection.prototype.insert = function() {
  throw new Error('Collection#insert unimplemented by driver');
};

View on GitHub (pinned to 49cdab0136)

When it happens

Trigger: Thrown at lib/collection.js:192 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of Automattic/mongoose@49cdab0136 (2026-08-21). Data as JSON: /api/errors/9a0433c38d297261. Report an issue: GitHub.