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laravel--Why are the attributes not defined in the model, but the values ​​are taken out? Where do these attributes come from?

WBOY
WBOYOriginal
2016-09-20 03:30:231619browse

Look at this code in laravel model, 

<span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span><span style="color: #000000;"> getLimitUsersAttribute()
  {
    </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">$this</span>->user_limit - <span style="color: #800080;">$this</span>-><span style="color: #000000;">user_count;
  }</span>

But there is no definition in the model, 

那么user_limit和<span>user_count属性，是从哪里来的？<br>laravel本身一种机制，可以直接在模型当中调用数据库里字段,这个属性就是</span>Lesson模型对应的lession表里的2个字段

使用一下看看，控制器是这样来使用

方法在看一看

那么这样输出的结果应该是65，看看结果吧



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