Question

我在函数开头声明的数组中推送值，但最后数组为空。我在推送后打印值并打印它们但是在exec（）之外，数组是空的。我需要获取我在organizational_with_sites变量中推送的所有值，并且需要将该数组作为响应发送。

module.exports = {getOrganizations: function (req, res) {

var userId = req.userId;
var organizations_with_sites = [];
UserPermission.find({
  where: {user: userId}
}).exec(function (err, user_organizations) {
  // users permitted organizations id
  user_organizations.forEach(function (organization, index) {
    Organization.find({
      where: {id: organization.organization}
    }).exec(function (err, organizations) {

      // users organizations
      organizations.forEach(function (organization, index) {
        Site.find({
          where: {organization: organization.id}
        }).exec(function (err, sites) {

          var organization_structure = {
            id: organization.id,
            name: organization.name,
            address: organization.address,
            sites: sites
          };

          organizations_with_sites.push(organization_structure);
        });
      });

    });
  });

});

return res.json({
  organizations: organizations_with_sites
});}};

输出

{
"organizations": []}

Answer 1

通常，很难从循环中使用异步逻辑（如从数据库中提取）的module.exports = {getOrganizations: function (req, res) { var userId = req.userId; var organizations_with_sites = []; UserPermission.find({ where: {user: userId} }).exec(function (err, user_organizations) { // HERE track how many results you expect var num = user_organizations.length; // users permitted organizations id user_organizations.forEach(function (organization, index) { Organization.find({ where: {id: organization.organization} }).exec(function (err, organizations) { // users organizations organizations.forEach(function (organization, index) { Site.find({ where: {organization: organization.id} }).exec(function (err, sites) { var organization_structure = { id: organization.id, name: organization.name, address: organization.address, sites: sites }; organizations_with_sites.push(organization_structure); // HERE return if you have all results if (organizations_with_sites.length >= num) { return res.json({organizations: organizations_with_sites}); } }); }); }); }); }); }};循环中获取结果。你应该调查承诺来处理这个问题。

在您的情况下，您可以添加一个hacky计数器，以便在合适的时间返回。

{{1}}

更改在exec函数sailjs外声明的变量

1 个答案: