Association between models in different databases in Laravel

Suppose the relationship between ModelA and ModelB is BelongsTo

If they both belong to the same database connection

then

<span>public</span><span>function</span><span> a(){
    </span><span>return</span><span>$this</span>->belongsTo("ModelA"<span>)          
}</span>

If the two models belong to different databases

then

<span>public</span><span>function</span><span> a()
{
    </span><span>$instance</span> = <span>new</span><span> ModelA;
    </span><span>$instance</span>->setConnection(<span>$a_conn</span><span>);
    </span><span>$query</span> = <span>$instance</span>-><span>newQuery();
    </span><span>return</span><span>new</span> BelongsTo(<span>$query</span>, <span>$this</span><span>);
}</span>

The above introduces the relationship between the models of different databases in Laravel, including aspects of the content. I hope it will be helpful to friends who are interested in PHP tutorials.