<span class="hljs-string">'erb_id'</span>)-&gt;references(<span class="hljs-string">'id'</span>)-&gt;on(<span class="hljs-string">'erbs'</span>)-&gt;onUpdate(<span class="hljs-string">'cascade'</span>)-&gt;onDelete(<span class="hljs-string">'cascade'</span>)-&gt;nullable();
            $table-&gt;timestamps();
        });
    }

    <span class="hljs-comment">/**
     * Reverse the migrations.
     *
     * <span class="hljs-doctag">@return</span> void
     */</span>
    <span class="hljs-keyword">public</s