<p>{</p>
<p>&nbsp; &nbsp; "success": false,</p>
<p>&nbsp; &nbsp; "err": {}</p>
<p>}</p>
<p></p>
<p>포스트맨 결과입니다.</p>
<p>제 아래 코드에요 ㅠㅠ....</p>
<div style="color: #d4d4d4; background-color: #1e1e1e; font-family: Consolas, 'Courier New', monospace; font-size: 14px; line-height: 19px; white-space: pre;"><br />
<div><span style="color: #4fc1ff;">userSchema</span>.<span style="color: #dcdcaa;">pre</span>(<span style="color: #ce9178;">"save"</span>,&nbsp;<span style="color: #9cdcfe;">next</span>&nbsp;<span style="color: #569cd6;">=&gt;</span>&nbsp;{</div>
<div>&nbsp;&nbsp;<span style="color: #569cd6;">var</span>&nbsp;<span style="color: #9cdcfe;">user</span>&nbsp;=&nbsp;<span style="color: #569cd6;">this</span>;</div>
<br />
<div>&nbsp;&nbsp;<span style="color: #c586c0;">if</span>&nbsp;(<span style="color: #9cdcfe;">user</span>.<span style="color: #dcdcaa;">isModified</span>(<span style="color: #ce9178;">"password"</span>))&nbsp;{</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;<span style="color: #6a9955;">//비밀번호&nbsp;암호화&nbsp;시킨다</span></div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;<span style="color: #4fc1ff;">bcrypt</span>.<span style="color: #dcdcaa;">genSalt</span>(<span style="color: #4fc1ff;">saltRounds</span>,&nbsp;(<span style="color: #9cdcfe;">err</span>,&nbsp;<span style="color: #9cdcfe;">salt</span>)&nbsp;<span style="color: #569cd6;">=&gt;</span>&nbsp;{</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="color: #c586c0;">if</span>&nbsp;(<span style="color: #9cdcfe;">err</span>)&nbsp;<span style="color: #c586c0;">return</span>&nbsp;<span style="color: #dcdcaa;">next</span>(<span style="color: #9cdcfe;">err</span>);</div>
<br />
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="color: #4fc1ff;">bcrypt</span>.<span style="color: #dcdcaa;">hash</span>(<span style="color: #9cdcfe;">user</span>.<span style="color: #9cdcfe;">password</span>,&nbsp;<span style="color: #9cdcfe;">salt</span>,&nbsp;(<span style="color: #9cdcfe;">err</span>,&nbsp;<span style="color: #9cdcfe;">hash</span>)&nbsp;<span style="color: #569cd6;">=&gt;</span>&nbsp;{</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="color: #c586c0;">if</span>&nbsp;(<span style="color: #9cdcfe;">err</span>)&nbsp;<span style="color: #c586c0;">return</span>&nbsp;<span style="color: #dcdcaa;">next</span>(<span style="color: #9cdcfe;">err</span>);</div>
<br />
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="color: #9cdcfe;">user</span>.<span style="color: #9cdcfe;">password</span>&nbsp;=&nbsp;<span style="color: #9cdcfe;">hash</span>;</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="color: #dcdcaa;">next</span>();</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;});</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;});</div>
<div>&nbsp;&nbsp;}</div>
<div>});</div>
</div>

<p>user를 this로 정해주었는데 기본적으로 arrow function 에서는 this바인딩이 안되고 상위 scope를 this로 지정주니까 user가 다른걸로 정해져서 그런거 아닐까요..?? 일반적인 function(){}형식의 함수에서는 this바인딩이 가능하니까</p>

<p>저도 해당 내용으로 해결했는데요, 왜 차이가 생기는지 아시나요?</p>

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