ruby-on-rails - Rails 嵌套属性未更新

标签 ruby-on-rails ruby-on-rails-3 nested-forms nested-attributes

我正在构建我的第一个 Rails 应用程序，其中的一个重要功能是拥有会说和/或想要学习语言的用户。在用户编辑个人资料页面中，我允许他/她从列表中选择他/她说的语言和/或想要学习的语言(我正在使用 ryanb 的nested_form gem):

enter image description here

这涉及到 3 个模型:User、Speaks、Language

languages 表只是一个包含世界语言的表，它不会改变。它基本上由语言及其名称的 ISO 代码组成。我通过运行从我下载的官方文件中读取的脚本来填充它。我仍然只是使用 Rails 默认值，因此表有一个 id 列，并且一切正常。

然后我决定进行更改并删除 id 列，因为它无论如何都没有任何意义。我希望我的应用程序能够与 ISO 列表保持同步。我想要 ISO 代码来识别语言，而不是无意义的 ID。我想用

user.speaks.create!(language_id: "pt", level: 6)

而不是

user.speaks.create!(language_id: 129, level: 6)

我知道 ISO 列表不太可能发生更改，但如果发生更改，我只想使用新文件再次运行我的脚本，而不必担心 id 列是否仍与以前一样匹配相同的 ISO 代码。所以我做出了改变。现在我可以按照我想要的方式使用 user.speaks.create 并且关联在控制台中完美运行。问题是我的表格根本不再起作用了。数据已发送，但我不明白日志。他们显示了一堆选择，但没有插入或更新，我不明白为什么。有人有什么想法吗？

这是我的模型:

class User < ActiveRecord::Base
  attr_accessible ..., :speaks, :speaks_attributes, :wants_to_learn_attributes

  has_many :speaks, :class_name => "Speaks", :dependent => :destroy
  has_many :speaks_languages, :through => :speaks, :source => :language #, :primary_key => "iso_639_1_code"

  has_many :wants_to_learn, :class_name => "WantsToLearn", :dependent => :destroy
  has_many :wants_to_learn_languages, :through => :wants_to_learn, :source => :language #, :primary_key => "iso_639_1_code"

  ...

  accepts_nested_attributes_for :speaks #, :reject_if => :speaks_duplicate, :allow_destroy => true
  accepts_nested_attributes_for :wants_to_learn #, :reject_if => :wants_to_learn_duplicate, :allow_destroy => true

  # EDIT 1: I remembered these pieces of code silenced errors, so I commented them out

...
end

class Speaks < ActiveRecord::Base
  self.table_name = "speak"
  attr_accessible :language, :language_id, :level
  belongs_to :user
  belongs_to :language

  validates :user, :language, :level, presence: true
  ...
end

#EDIT 4:

class WantsToLearn < ActiveRecord::Base
  self.table_name = "want_to_learn"
  attr_accessible :language, :language_id
  belongs_to :user
  belongs_to :language

  validates :user, :language, presence: true

  ...
end

class Language < ActiveRecord::Base
  attr_accessible :iso_639_1_code, :name_en, :name_fr, :name_pt

  has_many :speak, :class_name => "Speaks"
  has_many :users_who_speak, :through => :speak, :source => :user

  has_many :want_to_learn, :class_name => "WantsToLearn"
  has_many :users_who_want_to_learn, :through => :want_to_learn, :source => :user
end

Controller :

def update
    logger.debug params
    if @user.update_attributes(params[:user])
        @user.save
        flash[:success] = "Profile updated"
        sign_in @user
        redirect_to :action => :edit
    else
        render :action => :edit
    end
end

查看:

<%= nested_form_for(@user, :html => { :class => "edit-profile-form"} ) do |f| %>
      <%= render 'shared/error_messages' %>
      <table border="0">
        <tr><td colspan="2"><h2 id="languages" class="bblabla">Languages</h2></td></tr>
        <tr>
          <td><span>Languages you speak</span></td>
          <td class="languages-cell">
            <div id="speaks">
            <%= f.fields_for :speaks, :wrapper => false do |speaks| %>
              <div class="fields">
                <%= speaks.select(:language_id,
                                    Language.all.collect {|lang| [lang.name_en, lang.id]},
                                    { :selected => speaks.object.language_id, :include_blank => false },
                                    :class => 'language') %>
                <%= speaks.label :level, "Level: " %>
                <%= speaks.select(:level, Speaks.level_options, { :selected => speaks.object.level }, :class => 'level') %>
                <%= speaks.link_to_remove raw("<i class='icon-remove icon-2x'></i>"), :class => "remove-language" %>
              </div>
            <% end %>
            </div>
          <p class="add-language"><%= f.link_to_add "Add language", :speaks, :data => { :target => "#speaks" } %></p>
          </td>
        </tr>
        ...

日志:

Started PUT "/users/1" for 127.0.0.1 at 2013-07-19 08:41:16 -0300
Processing by UsersController#update as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"ZmaU9...", "user"=>{"speaks_attributes"=>{"0"=>{"language_id"=>"pt", "level"=>"6", "_destroy"=>"false"}, "1374234067848"=>{"language_id"=>"en", "level"=>"5", "_destroy"=>"false"}}, "wants_to_learn_attributes"=>{"0"=>{"language_id"=>"ro", "_destroy"=>"false", "id"=>"1"}}, "home_location_attributes"=>{"google_id"=>"7789d9...", "latitude"=>"-22.9035393", "longitude"=>"-43.20958689999998", "city"=>"Rio de Janeiro", "neighborhood"=>"", "administrative_area_level_1"=>"Rio de Janeiro", "administrative_area_level_2"=>"", "country_id"=>"BR", "id"=>"1"}, "gender"=>"2", "relationship_status"=>"2", "about_me"=>""}, "commit"=>"Save changes", "id"=>"1"}
  [1m[35mUser Load (0.3ms)[0m  SELECT "users".* FROM "users" WHERE "users"."remember_token" = 'bjdvI...' LIMIT 1
  [1m[36mUser Load (0.2ms)[0m  [1mSELECT "users".* FROM "users" WHERE "users"."id" = $1 LIMIT 1[0m  [["id", "1"]]
{"utf8"=>"✓", "_method"=>"put", "authenticity_token"=>"ZmaU9W...", "user"=>{"speaks_attributes"=>{"0"=>{"language_id"=>"pt", "level"=>"6", "_destroy"=>"false"}, "1374234067848"=>{"language_id"=>"en", "level"=>"5", "_destroy"=>"false"}}, "wants_to_learn_attributes"=>{"0"=>{"language_id"=>"ro", "_destroy"=>"false", "id"=>"1"}}, "home_location_attributes"=>{"google_id"=>"7789d9...", "latitude"=>"-22.9035393", "longitude"=>"-43.20958689999998", "city"=>"Rio de Janeiro", "neighborhood"=>"", "administrative_area_level_1"=>"Rio de Janeiro", "administrative_area_level_2"=>"", "country_id"=>"BR", "id"=>"1"}, "gender"=>"2", "relationship_status"=>"2", "about_me"=>""}, "commit"=>"Save changes", "action"=>"update", "controller"=>"users", "id"=>"1"}
  [1m[35m (0.1ms)[0m  BEGIN
  [1m[36mWantsToLearn Load (0.2ms)[0m  [1mSELECT "want_to_learn".* FROM "want_to_learn" WHERE "want_to_learn"."user_id" = 1 AND "want_to_learn"."id" IN (1)[0m
  [1m[35mLocation Load (0.3ms)[0m  SELECT "locations".* FROM "locations" WHERE "locations"."google_id" = '7789d...' AND "locations"."latitude" = '-22.9035393' AND "locations"."longitude" = '-43.20958689999998' AND "locations"."city" = 'Rio de Janeiro' AND "locations"."neighborhood" = '' AND "locations"."administrative_area_level_1" = 'Rio de Janeiro' AND "locations"."administrative_area_level_2" = '' AND "locations"."country_id" = 'BR' LIMIT 1
  [1m[36mUser Exists (40.0ms)[0m  [1mSELECT 1 AS one FROM "users" WHERE (LOWER("users"."email") = LOWER('<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="c2a3b0aba7ae82b2adacb6a7b1eca1adaf" rel="noreferrer noopener nofollow">[email protected]</a>') AND "users"."id" != 1) LIMIT 1[0m
  [1m[35m (96.7ms)[0m  UPDATE "users" SET "remember_token" = 'd0pb...', "updated_at" = '2013-07-19 11:41:16.808422' WHERE "users"."id" = 1
  [1m[36m (28.7ms)[0m  [1mCOMMIT[0m
  [1m[35m (0.1ms)[0m  BEGIN
  [1m[36mUser Exists (0.3ms)[0m  [1mSELECT 1 AS one FROM "users" WHERE (LOWER("users"."email") = LOWER('<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="31504358545d71415e5f4554421f525e5c" rel="noreferrer noopener nofollow">[email protected]</a>') AND "users"."id" != 1) LIMIT 1[0m
  [1m[35m (0.3ms)[0m  UPDATE "users" SET "remember_token" = 'gKlW...', "updated_at" = '2013-07-19 11:41:17.072654' WHERE "users"."id" = 1
  [1m[36m (0.4ms)[0m  [1mCOMMIT[0m
  Rendered shared/_error_messages.html.erb (0.0ms)
  [1m[35mSpeaks Load (0.3ms)[0m  SELECT "speak".* FROM "speak" WHERE "speak"."user_id" = 1
  [1m[36mWantsToLearn Load (0.2ms)[0m  [1mSELECT "want_to_learn".* FROM "want_to_learn" WHERE "want_to_learn"."user_id" = 1[0m
  [1m[35mLanguage Load (0.3ms)[0m  SELECT "languages".* FROM "languages" 
  [1m[36mCountry Load (0.3ms)[0m  [1mSELECT "countries".* FROM "countries" WHERE "countries"."iso_3166_code" = 'BR' LIMIT 1[0m
  [1m[35mCACHE (0.0ms)[0m  SELECT "languages".* FROM "languages" 
  [1m[36mCACHE (0.0ms)[0m  [1mSELECT "languages".* FROM "languages" [0m
  Rendered users/edit.html.erb within layouts/application (39.8ms)
  Rendered layouts/_shim.html.erb (0.0ms)
  Rendered layouts/_header.html.erb (1.1ms)
  Rendered layouts/_footer.html.erb (0.2ms)
Completed 200 OK in 576ms (Views: 160.7ms | ActiveRecord: 168.7ms)

希望有人有洞察力，因为过去两天我一直在互联网上查找，但没有运气。提前致谢!

编辑 1

按照 ovatsug25 的建议，我在建立关联后放置了 accepts_nested_attributes_for 行，但它似乎没有做出任何更改。不过，我记得 User 模型中有一些选项可以消除错误，这当然会阻碍调试，所以我将这些选项注释掉了。现在我遇到以下错误:

PG::Error: ERROR:  operator does not exist: character varying = integer
LINE 1: ...M "languages"  WHERE "languages"."iso_639_1_code" = 0 LIMIT ...
                                                             ^
HINT:  No operator matches the given name and argument type(s). You might need to add explicit type casts.
: SELECT  "languages".* FROM "languages"  WHERE "languages"."iso_639_1_code" = 0 LIMIT 1

我不知道为什么 Rails 试图选择 pk = 0 的语言。即使 pk 是一个整数，这也没有意义(会吗？？？)，因为默认 id 从 1 开始。甚至如果它从零开始，为什么它还要尝试选择它呢？这个零是从哪里来的？而且我无法“添加显式类型转换”。 pk 是一个字符串，并且永远不会是 0 或“0”。这个查询没有意义，根本不应该发生!

编辑2

我尝试更新控制台中的属性并得到以下结果:

irb(main):006:0> ariel = User.find(1)
  User Load (101.5ms)  SELECT "users".* FROM "users" WHERE "users"."id" = $1 LIMIT 1  [["id", 1]]
=> #<User id: 1, first_name: "Ariel", last_name: "Pontes", ...>
irb(main):007:0> params = {"user"=>{"speaks_attributes"=>{"0"=>{"language_id"=>"pt", "level"=>"6", "_destroy"=>"false"}, "1374444891951"=>{"language_id"=>"en", "l
evel"=>"5", "_destroy"=>"false"}}, "wants_to_learn_attributes"=>{"0"=>{"language_id"=>"ro", "_destroy"=>"false"}}, "home_location_attributes"=>{"google_id"=>"778...c5a", "latitude"=>"-22.9035393", "longitude"=>"-43.20958689999998", "city"=>"Rio de Janeiro", "neighborhood"=>"", "administrative
_area_level_1"=>"Rio de Janeiro", "administrative_area_level_2"=>"", "country_id"=>"BR", "id"=>"1"}, "gender"=>"2", "relationship_status"=>"2", "about_me"=>""}}
=> {"user"=>{"speaks_attributes"=>{"0"=>{"language_id"=>"pt", "level"=>"6", "_destroy"=>"false"}, "1374444891951"=>{"language_id"=>"en", "level"=>"5", "_destroy"=
>"false"}}, "wants_to_learn_attributes"=>{"0"=>{"language_id"=>"ro", "_destroy"=>"false"}}, "home_location_attributes"=>{"google_id"=>"778...c5a", "latitude"=>"-22.9035393", "longitude"=>"-43.20958689999998", "city"=>"Rio de Janeiro", "neighborhood"=>"", "administrative_area_level_1"=>"Rio de
 Janeiro", "administrative_area_level_2"=>"", "country_id"=>"BR", "id"=>"1"}, "gender"=>"2", "relationship_status"=>"2", "about_me"=>""}}
irb(main):008:0> ariel.update_attributes(params[:user])
   (0.1ms)  BEGIN
  User Exists (0.5ms)  SELECT 1 AS one FROM "users" WHERE (LOWER("users"."email") = LOWER('<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="b5d4c7dcd0d9f5c5dadbc1d0c69bd6dad8" rel="noreferrer noopener nofollow">[email protected]</a>') AND "users"."id" != 1) LIMIT 1
   (24.9ms)  UPDATE "users" SET "remember_token" = '0tv...Cw', "updated_at" = '2013-07-22 15:45:30.705217' WHERE "users"."id" = 1
   (54.3ms)  COMMIT
=> true
irb(main):009:0>

基本上，它仅出于某种原因更新 remember_token 和 updated_at。

编辑3

我尝试仅更新口语，并且成功了:

irb(main):012:0> ariel.update_attributes({"speaks_attributes"=>{"0"=>{"language_id"=>"pt", "level"=>"6", "_destroy"=>"false"}, "1374444891951"=>{"language_id"=>"e
n", "level"=>"5", "_destroy"=>"false"}}})
   (0.2ms)  BEGIN
  User Load (0.4ms)  SELECT "users".* FROM "users" WHERE "users"."id" = 1 LIMIT 1
  Language Load (0.8ms)  SELECT "languages".* FROM "languages" WHERE "languages"."iso_639_1_code" = 'pt' LIMIT 1
  User Load (0.3ms)  SELECT "users".* FROM "users" WHERE "users"."id" = 1 LIMIT 1
  Language Load (0.2ms)  SELECT "languages".* FROM "languages" WHERE "languages"."iso_639_1_code" = 'en' LIMIT 1
  User Exists (0.2ms)  SELECT 1 AS one FROM "users" WHERE (LOWER("users"."email") = LOWER('<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="ddbcafb4b8b19dadb2b3a9b8aef3beb2b0" rel="noreferrer noopener nofollow">[email protected]</a>') AND "users"."id" != 1) LIMIT 1
   (0.2ms)  UPDATE "users" SET "remember_token" = 'MYh5X1XoF6OsVIo3rhDNzQ', "updated_at" = '2013-07-22 22:05:08.198025' WHERE "users"."id" = 1
  SQL (42.9ms)  INSERT INTO "speak" ("created_at", "language_id", "level", "updated_at", "user_id") VALUES ($1, $2, $3, $4, $5) RETURNING "id"  [["created_at", Mo
n, 22 Jul 2013 22:05:08 UTC +00:00], ["language_id", "pt"], ["level", 6], ["updated_at", Mon, 22 Jul 2013 22:05:08 UTC +00:00], ["user_id", 1]]
  SQL (0.4ms)  INSERT INTO "speak" ("created_at", "language_id", "level", "updated_at", "user_id") VALUES ($1, $2, $3, $4, $5) RETURNING "id"  [["created_at", Mon
, 22 Jul 2013 22:05:08 UTC +00:00], ["language_id", "en"], ["level", 5], ["updated_at", Mon, 22 Jul 2013 22:05:08 UTC +00:00], ["user_id", 1]]
   (14.7ms)  COMMIT
=> true

我开始担心这可能是巫术。

PS:有人知道为什么它会加载用户 3 次吗？看起来毫无意义且浪费。

最佳答案

最大的线索是这个引起你注意的错误:

HINT:  No operator matches the given name and argument type(s). You might need to add explicit type casts.
: SELECT  "languages".* FROM "languages"  WHERE "languages"."iso_639_1_code" = 0 LIMIT 1

如果您为模型属性提供字符串值，但基础数据库列是数字列，Rails 会尝试将字符串值转换为适当的数字类型。因此，如果基础列的类型为整数，则字符串输入将被解释为整数，使用 String#to_i 。如果字符串不是以数字开头，它将被转换为 0。

Rails console (rails c) 是调试此类问题的有用工具。在这种情况下，您可以在控制台上运行 WantsToLearn.columns_hash['language_id'].type 来查看 Rails 认为应该为该属性使用什么类型。当然，您也可以轻松检查迁移。

关于ruby-on-rails - Rails 嵌套属性未更新，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/17755414/

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