😄 Database API

// src/api/posts/posts.ctrl.js

import Post from '../../models/post';

export const write = async (ctx) => {
  const { title, body, tags } = ctx.request.body;
  const post = new Post({
    title,
    body,
    tags,
  });
  try {
    await post.save();
    ctx.body = post;
  } catch (e) {
    ctx.throw(500, e);
  }
};

export const list = async (ctx) => {
  try {
    const posts = await Post.find().exec();
    ctx.body = posts;
  } catch (e) {
    ctx.throw(500, e);
  }
};

export const read = async (ctx) => {
  const { id } = ctx.params;
  try {
    const post = await Post.findById(id).exec();
    if (!post) {
      ctx.status = 404;
      return;
    }
    ctx.body = post;
  } catch (e) {
    ctx.throw(500, e);
  }
};

export const remove = async (ctx) => {
  const { id } = ctx.params;
  try {
    await Post.findByIdAndDelete(id).exec();
    ctx.status = 204;
  } catch (e) {
    ctx.throw(500, e);
  }
};

export const update = async (ctx) => {
  const { id } = ctx.params;
  try {
    const post = await Post.findByIdAndUpdate(id, ctx.request.body, {
      new: true,
    }).exec();

    if (!post) {
      ctx.status = 404;
      return;
    }
    ctx.body = post;
  } catch (e) {
    ctx.throw(500, e);
  }
};

😎 요청 검증

• @hapi/joi를 사용하여 구현한다.

// src/api/posts/posts.ctrl.js

...
const { ObjectId } = mongoose.Types;

export const checkObjectId = (ctx, next) => {
  const { id } = ctx.params;
  if (!ObjectId.isValid(id)) {
    ctx.status = 400;
    return;
  }
  return next();
};

...

export const write = async (ctx) => {
  const schema = Joi.object().keys({
    title: Joi.string().required(),
    body: Joi.string().required(),
    tags: Joi.array().items(Joi.string()).required(),
  });

  const result = schema.validate(ctx.request.body);

  if (result.error) {
    ctx.status = 400;
    ctx.body = result.error;
    return;
  }
  ...
};

😘 페이지네이션

• 페이지에 보여질 포스트의 개수는 10~20개가 적당하다.
• 글자도 처음 200자 정도면 충분하다.

...

// src/api/posts/posts.ctrl.js
export const list = async (ctx) => {
  // query는 문자열이라 숫자로 바꿔줘야 한다.
  const page = parseInt(ctx.query.page || '1', 10);

  if (page < 1) {
    ctx.status = 400;
    return;
  }

  try {
    const posts = await Post.find()
      .sort({ _id: -1 })
      .limit(10)
      .skip((page - 1) * 10)
      .lean() // JSON으로 가져오기
      .exec();
    const postCount = await Post.countDocuments().exec();
    ctx.set('Last-Page', Math.ceil(postCount / 10));
    ctx.body = posts.map((post) => ({
      ...post,
      body: post.body.length < 200 ? post.body : `${post.body.slice(0, 200)}`,
    }));
  } catch (e) {
    ctx.throw(500, e);
  }
};