BreezeJs在页面上加载了5次元数据，尝试使用fetchMetaData，但是它出错 [英] BreezeJs loading metadata 5 times on the page, trying to use fetchMetaData but it errors

问题描述

我试图在页面上执行任何查询之前获取元数据，因为每个查询尝试获取总共5次元数据并且页面非常慢.我希望这会有所帮助.

I am trying to get the metadata before I perform any queries on the page, because each query is trying to get the metadata for a total of 5 times and the page is very slow. I am hoping this helps.

//版本信息:var breeze = {版本:"1.5.4"，metadataVersion:"1.0.5"};

//version info: var breeze = { version: "1.5.4", metadataVersion: "1.0.5" };

但是我遇到此错误:

manager.fetchMetadata(...).then(...).fail不是函数

这是代码示例:

var manager = emProvider.createManager();

function getMetaData()
{
    var deferred = $q.defer();

    manager.fetchMetadata()
          .then(function (data, status) {

              deferred.resolve(data);
              console.log('manager.fetchMetadata() success');
          })
          .fail(function (data, status) {

              deferred.reject(data);
              console.log('manager.fetchMetadata() reject');
          });

    return deferred.promise;
}

这就是注入的"emProvider"服务中的createManager函数的样子.

THis is what the createManager function looks like from the injected 'emProvider' service.

  var masterManager = new breeze.EntityManager(serviceRoot + 'odata/');

   // private function to create a new manager
    function createManager() {
        var manager = masterManager.createEmptyCopy(); // same configuration; no    entities in cache.
        // ... copy in some entities (e.g.,picklists) from masterManager
        return manager;
    }

推荐答案

如果您使用的是AngularJS中的 $ q ，则应使用 .catch 而不是.fail . AngularJS使用.catch 来处理承诺中的错误.

If you are using $q from AngularJS, you should use .catch instead of .fail. AngularJS uses .catch for errors in promises.

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