使用forEach和IF使用PUT方法更改电影名称

Question

let movies = [
{
    id: 1,
    title: 'Spider-Man',
    duration: 129,
    genre: 'Adventure'
},
{
    id: 2,
    title: 'Toy Story 4',
    duration: 100,
    genre: 'Animation'
},
{
    id: 3,
    title: 'X-Men',
    duration: 113,
    genre: 'Action'
}

router.put（“/movies/:id”,function（req,res）{}

但是我不知道在{}里面放什么

Answer 1

我不知道在{}里面放什么

包含更新数组的逻辑的代码。

例如：

router.put('/movies/:id', function(req, res, next) {
  try {
    // get id from :id, parse it to an int
    let id = parseInt(req.params.id, 10) || false

    // validate
    if (!id) {
      let err = new Error('Invalid movie id')
      err.status = 422
      throw err
    }

    // find the movie
    let index = movies.findIndex(v => v.id === id)

    if (index === -1) {
      let err = new Error('Movie not found')
      err.status = 404
      throw err
    }

    // seems good, now lets validate body
    let errors = {}

    // id
    if (!req.body.id) {
      errors.id = 'Id is a required field'
    } else if (isNaN(req.body.id)) {
      errors.id = 'Id is invalid, number required'
    }

    //title
    if (!req.body.title) {
      errors.title = 'Title is a required field'
    } else if (req.body.title.length <= 1) {
      errors.title = 'Title too short, enter greater than 1 character'
    } else if (req.body.title.length >= 255) {
      errors.title = 'Title too long, enter less than 255 characters'
    }

    // duration
    if (typeof req.body.duration === 'undefined') {
      errors.duration = 'Duration is a required field'
    } else if (req.body.duration < 0) {
      errors.duration = 'Duration cannot be negative, enter greater than 0 minute'
    } else if (req.body.duration >= 1440) {
      errors.duration = 'Duration too long, enter less than than 1440 minutes (1 day)'
    }

    //genre
    if (!req.body.genre) {
      errors.genre = 'Genre is a required field'
    }

    // has errors
    if (Object.keys(errors).length) {
      let err = new Error('Invlid inputs')
      err.status = 422
      err.errors = errors
      throw err
    }

    //
    movies[index] = {
      id: req.body.id,
      title: req.body.title,
      duration: req.body.duration,
      genre: req.body.genre
    }

    // send success response
    res.json({
      status: 200
    })
  } catch (err) {
    next(err)
  }
})

app.use(function(error, req, res, next) {

  // set response header
  res.status(error.status || 500)

  // is xhr/ajax
  if (req.xhr) {
    res.json(error)
  }
  // not ajax
  else {
    res.render('error', error)
  }
})