Question

当我尝试在终端中运行rails db：seed时，我遇到了问题。它给了我以下错误：

NoMethodError：未定义的方法`[]'为nil：NilClass

你能帮帮我吗？到目前为止，我尝试了几件但没有运气。

(1..50).each do |movie|
  response = HTTParty.get("https://api.themoviedb.org/3/movie/popular?api_key=8d027704c57524153a0af2b38415ac45&language=en-US&page=1")
  results = JSON.parse(response.body)

  movie = Movie.new({
    title: results["title"],
    popularity: results[0]["popularity"],
    image: results["poster_path"],
    year: results[0]["release_date"],
    genre: results[0]["genre_ids"]
    })

    movie.save
    puts "#{movie['title']} was saved."
  end

我的架构如下所示：

  create_table "movies", force: :cascade do |t|
    t.string "title"
    t.string "image"
    t.string "year"
    t.string "genre"
    t.string "rating"
    t.string "popularity"
    t.string "video"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
  end

感谢您的帮助。

Answer 1

JSON具有结构：

{
  "page": 1,
  "total_pages": 978,
  "total_results": 19552,
  "results": [..]
}

更改

results = JSON.parse(response.body)

要

results = JSON.parse(response.body)['results']

您的代码在其他地方也被破坏了。这是我的建议：

res = HTTParty.get('https://api.themoviedb.org/3/movie/popular?api_key=8d027704c57524153a0af2b38415ac45&language=en-US&page=1')
results = JSON.parse(res.body)['results']

results.each do |result|
  movie = Movie.create({
    title: result['title'],
    popularity: result['popularity'],
    image: result['poster_path'],
    year: result['release_date'],
    genre: result['genre_ids']
  })

  puts "#{movie.title} was saved."
end

NoMethodError：nil：NilClass的未定义方法`[]'

1 个答案: