123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145

/** * Test dependencies. */
'use strict';
const start = require('./common');
const assert = require('assert');
const mongoose = start.mongoose;const DivergentArrayError = mongoose.Error.DivergentArrayError;
/** * Tests. */
describe('model: populate: divergent arrays', function() {  // match  // skip  // limit  // -_id  //  // $set  // $pop -1  // $pop 1
  let db, C, M;
  before(async function() {    db = start();    C = db.model('Child', { _id: Number, name: String });    M = db.model('Parent', { array: { type: [{ type: Number, ref: 'Child' }] } });
    await C.create(      { _id: 0, name: 'zero' },      { _id: 1, name: 'one' },      { _id: 2, name: 'two' }    );
    await M.create({ array: [0, 1, 2] });  });
  after(async function() {    await db.close();  });
  function test(check, fn) {    it('using $set', function(done) {      fn(function(err, doc) {        assert.ifError(err);        doc.array.unshift({ _id: 10, name: 'ten' });        doc.save(function(err) {          check(err);          done();        });      });    });    it('using $pop 1', function(done) {      fn(function(err, doc) {        assert.ifError(err);        doc.array.$pop();        doc.save(function(err) {          check(err);          done();        });      });    });    it('using $pop -1', function(done) {      fn(function(err, doc) {        assert.ifError(err);        doc.array.$shift();        doc.save(function(err) {          check(err);          done();        });      });    });  }
  function testOk(fn) {    test(assert.ifError.bind(assert), fn);  }
  function testFails(fn) {    test(function(err) {      assert.ok(err instanceof DivergentArrayError, 'non-divergent error: ' + err);      assert.ok(/\sarray/.test(err.message));    }, fn);  }
  describe('from match', function() {    testFails(function(cb) {      M.findOne().populate({ path: 'array', match: { name: 'one' } }).exec(cb);    });  });  describe('from skip', function() {    describe('2', function() {      testFails(function(cb) {        M.findOne().populate({ path: 'array', options: { skip: 2 } }).exec(cb);      });    });    describe('0', function() {      testOk(function(cb) {        M.findOne().populate({ path: 'array', options: { skip: 0 } }).exec(cb);      });    });  });  describe('from limit', function() {    describe('0', function() {      testFails(function(cb) {        M.findOne().populate({ path: 'array', options: { limit: 0 } }).exec(cb);      });    });    describe('1', function() {      testFails(function(cb) {        M.findOne().populate({ path: 'array', options: { limit: 1 } }).exec(cb);      });    });  });  describe('from deselected _id', function() {    describe('using string and only -_id', function() {      testFails(function(cb) {        M.findOne().populate({ path: 'array', select: '-_id' }).exec(cb);      });    });    describe('using string', function() {      testFails(function(cb) {        M.findOne().populate({ path: 'array', select: 'name -_id' }).exec(cb);      });    });    describe('using object and only _id: 0', function() {      testFails(function(cb) {        M.findOne().populate({ path: 'array', select: { _id: 0 } }).exec(cb);      });    });    describe('using object', function() {      testFails(function(cb) {        M.findOne().populate({ path: 'array', select: { _id: 0, name: 1 } }).exec(cb);      });    });  });});