Rails 4形式:has_many通过:复选框 [英] Rails 4 Form: has_many through: checkboxes
问题描述
原始问题
两个资源:users
和animals.
在创建用户时,客户端选择复选框以说出它们有多少只动物.
Two resources: users
and animals.
When creating a user, the client selects check boxes to say how many animals they have.
提交用户表单时,它不仅应创建一个新的user
记录,而且还应在animal_users
富连接表中创建一堆记录,以表示客户端选择的每个复选框.
When the user form is submitted, it should not only create a new user
record, but it should also create a bunch of records in the animal_users
rich join table to represent each of the check boxes the client selected.
我认为的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 ,
The issue I think is that I am not specifying something correctly for the checkbox part within the form. I have looked at the checkbox_tag API, the Rails Guides on Forms, and many websites and stackOverflow posts.
在此先感谢,代码如下:
Thanks in advance, code below:
原始代码(答案代码进一步向下) :
Original code (answer code further down):
型号:
models:
#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
user
表单:
The user
form:
#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
def user_params
params.require(:user).permit(:name, animal_users_attributes: [:_destroy, :id, :user_id, :animal_id])
end
在此处回答代码:
型号:
models:
#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
user
表单:
The user
form:
#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
def user_params
params.require(:user).permit(:name, animal_ids: [])
end
为了完整起见,这是在提交表单后传递到服务器的内容:
And just for the sake of completeness, here is what is passed into the server upon form submission:
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
推荐答案
<% Animal.all.each do |animal| %>
<label>
<%= check_box_tag "user[animal_ids][]", animal.id, f.object.animals.include?(animal) %>
<%= animal.name %>
</label>
<% end %>
,并且您必须在控制器参数上接受带有ID数组的哈希,例如
and you have to accept a hash with an array of ids on your controller params, something like
{ animal_ids: [] }
也许读这可以有所帮助: http://millarian.com/programming/ruby-on-rails/quick -tip-has_many-through-checkboxes/
maybe reading this can help: http://millarian.com/programming/ruby-on-rails/quick-tip-has_many-through-checkboxes/
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