strapi/packages/strapi-plugin-users-permissions/config/queries/mongoose.js

const _ = require('lodash');
const { convertRestQueryParams, buildQuery } = require('strapi-utils');

module.exports = ({ model }) => ({
  find(params, populate) {
    const filters = convertRestQueryParams(params);

    return buildQuery({
      model,
      filters,
      populate: populate || model.associations.map(x => x.alias),
    }).lean();
  },

  count(params) {
    const filters = convertRestQueryParams(params);

    return buildQuery({
      model,
      filters: { where: filters.where },
    }).count();
  },

  findOne(params, populate) {
    const primaryKey = params[model.primaryKey] || params.id;

    if (primaryKey) {
      params = {
        [model.primaryKey]: primaryKey,
      };
    }

    return model
      .findOne(params)
      .populate(populate || model.associations.map(x => x.alias).join(' '))
      .lean();
  },

  create(params) {
    return model
      .create(
        Object.keys(params).reduce((acc, current) => {
          if (
            _.get(model._attributes, [current, 'type']) ||
            _.get(model._attributes, [current, 'model'])
          ) {
            acc[current] = params[current];
          }

          return acc;
        }, {})
      )
      .catch(err => {
        if (err.message.indexOf('index:') !== -1) {
          const message = err.message.split('index:');
          const field = _.words(_.last(message).split('_')[0]);
          const error = { message: `This ${field} is already taken`, field };

          throw error;
        }

        throw err;
      });
  },

  update(search, params = {}) {
    if (_.isEmpty(params)) {
      params = search;
    }

    const primaryKey = search[model.primaryKey] || search.id;

    if (primaryKey) {
      search = {
        [model.primaryKey]: primaryKey,
      };
    }

    return model
      .updateOne(search, params, {
        strict: false,
      })
      .catch(error => {
        const field = _.last(_.words(error.message.split('_')[0]));
        const err = { message: `This ${field} is already taken`, field };

        throw err;
      });
  },

  delete(params) {
    // Delete entry.
    return model.deleteOne({
      [model.primaryKey]: params[model.primaryKey] || params.id,
    });
  },

  deleteMany(params) {
    // Delete entry.
    return model.deleteMany({
      [model.primaryKey]: {
        $in: params[model.primaryKey] || params.id,
      },
    });
  },

  search(params) {
    const re = new RegExp(params.id);

    return model.find({
      $or: [{ username: re }, { email: re }],
    });
  },

  addPermission(params) {
    return model.create(params);
  },

  removePermission(params) {
    return model.remove(params);
  },
});