{"record":{"id":"163a367188aa943c","repo":"Automattic/mongoose","slug":"you-must-pass-a-valid-discriminator-schema","errorCode":null,"errorMessage":"You must pass a valid discriminator Schema","messagePattern":"You must pass a valid discriminator Schema","errorType":"exception","errorClass":"Error","httpStatus":null,"severity":"error","filePath":"lib/helpers/model/discriminator.js","lineNumber":72,"sourceCode":"   * @param {Iterable<string>} i2\n   */\n  function* setIntersection(i1, i2) {\n    const s1 = new Set(i1);\n    for (const item of i2) {\n      if (s1.has(item)) {\n        yield item;\n      }\n    }\n  }\n}\n\n/*!\n * ignore\n */\n\nmodule.exports = function discriminator(model, name, schema, tiedValue, applyPlugins, mergeHooks, overwriteExisting) {\n  if (!schema?.instanceOfSchema) {\n    throw new Error('You must pass a valid discriminator Schema');\n  }\n\n  mergeHooks = mergeHooks == null ? true : mergeHooks;\n\n  if (model.schema.discriminatorMapping &&\n      !model.schema.discriminatorMapping.isRoot) {\n    throw new Error('Discriminator \"' + name +\n        '\" can only be a discriminator of the root model');\n  }\n\n  if (applyPlugins) {\n    const applyPluginsToDiscriminators = get(model.base,\n      'options.applyPluginsToDiscriminators', false) || !mergeHooks;\n    // Even if `applyPluginsToDiscriminators` isn't set, we should still apply\n    // global plugins to schemas embedded in the discriminator schema (gh-7370)\n    model.base._applyPlugins(schema, {\n      skipTopLevel: !applyPluginsToDiscriminators\n    });","sourceCodeStart":54,"sourceCodeEnd":90,"githubUrl":"https://github.com/Automattic/mongoose/blob/49cdab01366679723b487ecb754b38570f783289/lib/helpers/model/discriminator.js#L54-L90","documentation":"Error \"You must pass a valid discriminator Schema\" thrown in Automattic/mongoose.","triggerScenarios":"Thrown at lib/helpers/model/discriminator.js:72 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"49cdab01366679723b487ecb754b38570f783289","analyzedAt":"2026-08-21T22:54:00.882Z","schemaVersion":2},"datasetVersion":"2026-08-21T23:17:16.201Z"}