在Sails控制器中执行操作之前

Question

有没有办法在Sails控制器中定义的每个和所有操作之前执行操作/功能？类似于beforeCreate模型中的钩子.

例如,在我的DataController中,我有以下操作:

module.exports = {
  mockdata: function(req, res) {
    var criteria = {};

    // collect all params
    criteria = _.merge({}, req.params.all(), req.body);
    //...some more login with the criteria...
  },
  getDataForHost: function(req, res) {
    var criteria = {};

    // collect all params
    criteria = _.merge({}, req.params.all(), req.body);
    //...some more login with the criteria...
  }
};

我可以做以下事情:

module.exports = {
  beforeAction: function(req, res, next) {
    var criteria = {};

    // collect all params
    criteria = _.merge({}, req.params.all(), req.body);
    // store the criteria somewhere for later use
    // or perhaps pass them on to the next call
    next();
  },

  mockdata: function(req, res) {
    //...some more login with the criteria...
  },
  getDataForHost: function(req, res) {
    //...some more login with the criteria...
  }
};

如果对定义的任何操作的任何调用将首先通过beforeAction？

Answer 1

您可以在此处使用策略。

例如，将自定义策略创建为api/policies/collectParams.js：

module.exports = function (req, res, next) {
    // your code goes here
};

您可以指定此策略是否适用于所有控制器/操作，或者仅适用于以下中的特定控制器/操作config/policies.js：

module.exports.policies = {
    // Default policy for all controllers and actions
    '*': 'collectParams',

    // Policy for all actions of a specific controller
    'DataController': {
        '*': 'collectParams'
    },

    // Policy for specific actions of a specific controller
    'AnotherController': {
        someAction: 'collectParams'
    }
};

有时您可能需要知道当前控制器是什么（来自您的策略代码）。您可以轻松地将其添加到您的api/policies/collectParams.js文件中：

console.log(req.options.model);      // Model name - if you are using blueprints
console.log(req.options.controller); // Controller name
console.log(req.options.action);     // Action name