原始问题
两个资源:用户
和动物。
创建用户时,客户端会选择复选框来说明他们拥有多少动物。
当提交用户表单时,它不仅应该创建一个新的user
记录,还应该在animal_users
丰富的连接表中创建一堆记录来代表客户选择的每个复选框。
我认为问题是我没有为表单中的复选框部分正确指定某些内容。我看过checkbox_tag API ,Rails Guides on Forms ,以及许多网站和 stackOverflow 帖子。
提前致谢,代码如下:
原始代码(下面的答案代码):
型号:
#models/user.rb
class User < ActiveRecord::Base
has_many :animals, through: :animal_users
has_many :animal_users
accepts_nested_attributes_for :animal_users, allow_destroy: true
end
#models/animal.rb
class Animal < ActiveRecord::Base
has_many :users, through: :animal_users
has_many :animal_users
end
#models/animal_user.rb
class AnimalUser < ActiveRecord::Base
belongs_to :animal
belongs_to :user
end
用户
表单:
#views/users/_form.html.erb
<%= form_for(@user) do |f| %>
<div class="field">
<%= f.label :name %><br>
<%= f.text_field :name %>
</div>
<div>
<% Animal.all.each do |animal| %>
<label>
<%= check_box_tag "user[animal_ids][]", animal.id, f.object.animals.include?(animal) %>
<%= animal.animal_name %>
<% end %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
users_controller.rb
中的强参数
def user_params
params.require(:user).permit(:name, animal_users_attributes: [:_destroy, :id, :user_id, :animal_id])
end
<小时/>
此处回答代码:
型号:
#models/user.rb
class User < ActiveRecord::Base
has_many :animals, through: :animal_users
has_many :animal_users
end
#models/animal.rb
class Animal < ActiveRecord::Base
has_many :users, through: :animal_users
has_many :animal_users
end
#models/animal_user.rb
class AnimalUser < ActiveRecord::Base
belongs_to :animal
belongs_to :user
end
用户
表单:
#views/users/_form.html.erb
<%= form_for(@user) do |f| %>
<div class="field">
<%= f.label :name %><br>
<%= f.text_field :name %>
</div>
# Checkbox part of the form that now works!
<div>
<% Animal.all.each do |animal| %>
<%= check_box_tag "user[animal_ids][]", animal.id, f.object.animals.include?(animal) %>
<%= animal.animal_name %>
<% end %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
users_controller.rb
中的强参数
def user_params
params.require(:user).permit(:name, animal_ids: [])
end
为了完整起见,以下是表单提交时传递到服务器的内容:
Parameters: {"utf8"=>"✓", "authenticity_token"=>"xyz=", "user"=>{"name"=>"Neil", "animal_ids"=>["1", "3"]}, "commit"=>"Create User"}
Animal Load (0.2ms) SELECT "animals".* FROM "animals" WHERE "animals"."id" IN (1, 3)
(0.1ms) begin transaction
SQL (0.2ms) INSERT INTO "users" ("created_at", "name", "updated_at") VALUES (?, ?, ?) [["created_at", "2015-03-26 15:29:00.478767"], ["name", "Neil"], ["updated_at", "2015-03-26 15:29:00.478767"]]
SQL (0.1ms) INSERT INTO "animal_users" ("animal_id", "created_at", "updated_at") VALUES (?, ?, ?) [["animal_id", 1], ["created_at", "2015-03-26 15:29:00.479833"], ["updated_at", "2015-03-26 15:29:00.479833"]]
SQL (0.0ms) INSERT INTO "animal_users" ("animal_id", "created_at", "updated_at") VALUES (?, ?, ?) [["animal_id", 3], ["created_at", "2015-03-26 15:29:00.480644"], ["updated_at", "2015-03-26 15:29:00.480644"]]
SQL (0.1ms) UPDATE "animal_users" SET "updated_at" = ?, "user_id" = ? WHERE "animal_users"."id" = 6 [["updated_at", "2015-03-26 15:29:00.481362"], ["user_id", 8]]
SQL (0.1ms) UPDATE "animal_users" SET "updated_at" = ?, "user_id" = ? WHERE "animal_users"."id" = 7 [["updated_at", "2015-03-26 15:29:00.482062"], ["user_id", 8]]
(2.4ms) commit transaction
最佳答案
collection_check_boxes是一个更好的选择:
<%= f.collection_check_boxes(:animal_ids, Animal.all, :id, :name) do |animal| %>
<%= animal.label { animal.check_box } %>
<% end %>
关于ruby-on-rails - rails 4 表格 : has_many through: checkboxes,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/29280294/