Question

我有一个game和两个team。我希望POST这样的事情可以/games -

{"game":{"home_team":1,"away_team":2,"time":"Wed, 12 Aug 2015 08:08:08 -0500","winner":1,"home_score":2,"away_score":1}}

我的game.rb模型看起来像这样 -

class Game < ActiveRecord::Base
  belongs_to :home_team_id, :class_name => "Team"
  belongs_to :away_team_id, :class_name => "Team"
  belongs_to :winner_id, :class_name => "Team"
...
end

我的team.rb模型看起来像这样 -

class Team < ActiveRecord::Base
  has_many :home_games, class_name: "Game"
  has_many :away_games, class_name: "Game"
  has_many :winners, class_name: "Game"
...
end

game的架构如下 -

  create_table "games", force: :cascade do |t|
    t.integer  "home_team_id"
    t.integer  "away_team_id"
    t.datetime "time"
    t.integer  "home_score"
    t.integer  "away_score"
    t.integer  "winner_id"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
  end

  add_index "games", ["away_team_id"], name: "index_games_on_away_team", using: :btree
  add_index "games", ["home_team_id"], name: "index_games_on_home_team", using: :btree
  add_index "games", ["winner_id"], name: "index_games_on_winner", using: :btree

我得到的错误是Team(#70124766940300) expected, got Fixnum(#70124749378140)"

Answer 1

这里有一个基本设置缺失。

架构不应该是"home_team"和"away_team"，而是"home_team_id"和"away_team_id"

同样在模型中，无需定义foreign_key: "home_team"或foreign_key: "away_team"。 Rails惯例（我相信）将假设belongs_to :home_team, :class_name => "Team"具有"home_team_id"

的外键

如果您在数据库级别（架构）考虑它，数据库不会在游戏表中存储有关home_team的所有信息。它只有一个home_game_id，因此它引用了home_game。这样，数据库就不需要为每个关联复制一堆数据。

修复后，Controller中可能还有其他错误，但错误消息告诉你的是它获取的是Team类而不是Fixnum，所以它可能会调用game.home_team并执行某些操作它，但你只是从数据库中提取home_team ID，而不是关联。

将JSON发布到具有ID的rails会导致错误

1 个答案: