为什么Laravel的Session :: flash行为不一致? [英] Why is Laravel's Session::flash behaving inconsistently?

问题描述

在使用Laravel 4.2应用程序时，我最近注意到对Session::flash(和类似的Input::flash)的调用有时表现不一致.

While working on a Laravel 4.2 app, I have recently noticed that calls to Session::flash (and similarly Input::flash) sometimes behave inconsistently.

一个特定的例子:我想从edit函数中刷新一些数据，以便可以在相应的update函数中访问它. edit视图包含一个相当简单的表单，包括一个字段，该字段在用户从下拉菜单中选择一个选项后通过AJAX调用加载.这是我的 MCVE :

One particular example: I want to flash some data from the edit function so that I can access it in the corresponding update function. The edit view contains a fairly simple form, including one field that is loaded via an AJAX call after the user selects an option from a drop-down. Here is my MCVE:

在MyController.php中:

<?php

class MyController {
  public function edit($id) {
    Session::flash('somevar', "myvalue");

    return View::make('edit');
  }

  public function update($id) {
    var_dump(Session::all()); die();

    if (Session::has('somevar')) {
      // do stuff
    }

    return Redirect::to('/');
  }
}

?>

在AjaxController.php中:

<?php

class AjaxController {
  public function getinfo() {
    return "here's that data you wanted";
  }
}

?>

在edit.blade.php中:

<script type="text/javascript">
  $('form select[name=foo]').change(function() {
    $.ajax({
      url: '/ajax/getinfo'
      success: function(data) {
        alert(data);
      }
    });
  });
</script>

<a href="/update/1">Update</a>

有时update()中的会话转储将显示闪存数据，但有时会丢失.

Sometimes the session dump in update() will show the flash data, but sometimes it is missing.

出了什么问题?

推荐答案

问题是需要额外的AJAX调用来填充其中一个字段.由于这算作一项请求，因此Flash数据对于该请求有效，但对下一个请求无效.

The issue is the extra AJAX call to populate one of the fields. Since this counts as a request, the flash data is active for that request, but not the next one.

为解决此问题，我在AJAX调用触发的函数的第一行中添加了Session::reflash()，如下所示:

To fix this issue, I added Session::reflash() to the first line of the function triggered by the AJAX call, like so:

<?php

class AjaxController {
  public function getinfo() {
    Session::reflash();

    return "here's that data you wanted";
  }
}

?>

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