我有3個表稱爲引腳(職位),流派(類別)和genre_pin(引腳和流派之間多對多,因爲引腳可以有很多流派)。Rails 4 - 多對多類別不會保存到數據庫
我正在嘗試構建創建表單,這將允許用戶選擇儘可能多的流派,因爲他們想要的針和保存/創建。創建工作正常,沒有錯誤,但它沒有將任何關係記錄保存到genre_pin表。我很確定我可能在這裏錯過了一些非常明顯的東西。
我使用的是'別針'和'類型'這兩個術語,但你可以把它們看作'帖子'和'類別'。
插針型
class Pin < ActiveRecord::Base
belongs_to :user
belongs_to :type
has_many :replies
has_many :genre_pins
has_many :genres, :through => :genre_pins
accepts_nested_attributes_for :genres, allow_destroy: true, reject_if: proc { |genre| genre[:id].blank? }
validates :user_id, presence: true
validates :type_id, presence: true
validates :title, presence: true
validates :description, presence: true
end
類型型號
class Genre < ActiveRecord::Base
has_many :genre_pins
has_many :pins, :through => :genre_pins
validates :title, presence: true
end
GenrePin型號
class GenrePin < ActiveRecord::Base
belongs_to :pin
belongs_to :genre
validates_uniqueness_of :pin_id, :scope => :genre_id
end
接下來,我針#新的觀點,我有以下形式:
引腳新視角
<%= form_for :pin, url: pins_path do |f| %>
<div class="small-12 columns">
<%= f.label :title %>
<%= f.text_field :title %>
</div>
<div class="small-12 columns">
<%= f.label :description %>
<%= f.text_area :description, :rows => 10 %>
</div>
<div class="small-12 columns">
<%= f.label :type %>
<%= f.collection_select :type_id, Type.order(:title), :id, :title, include_blank: false %>
</div>
<div class="small-12 columns">
<%= f.label :genres %>
<%= f.collection_select :genre_ids, Genre.order(:title), :id, :title, {}, { :multiple => true } %>
</div>
<div class="small-12 columns">
<%= f.submit "Create Pin", :class => "button" %>
</div>
<% end %>
視圖工作正常,並讓我從流派表可用的類型。但是,當我去保存表格時,會創建記錄(pin),但與流派的關係不是。我在這裏錯過了什麼?沒有錯誤拋出,只是沒有任何反應。我假設Rails應該通過與流派的關聯來創建這些PinGenre記錄。
引腳控制器(創建)
def create
@pin = Pin.new(pin_params)
@pin.user_id = current_user.id
@pin.save
if @pin.save
flash[:success] = "Pin successfully created"
redirect_to @pin
else
flash[:warning] = @pin.errors.full_messages.to_sentence
redirect_to :action => "new"
end
end
private
def pin_params
params.require(:pin).permit(:title, :description, :type_id, :genre_ids)
end
是否有進一步的措施我需要在這裏做什麼呢?記錄是否需要由我自己明確創建?
感謝您的幫助和耐心。我希望我已經清楚地說明了這一點。 Michael。
Schema.rb
ActiveRecord::Schema.define(version: 0) do
create_table "genre_pins", force: true do |t|
t.integer "pin_id"
t.integer "genre_id"
end
create_table "genres", force: true do |t|
t.string "title", null: false
end
create_table "pins", force: true do |t|
t.integer "user_id", null: false
t.string "title", limit: 160, null: false
t.text "description", null: false
t.decimal "latitude", precision: 10, scale: 8
t.decimal "longitude", precision: 11, scale: 8
t.datetime "created_at"
t.datetime "updated_at"
t.datetime "deleted_at"
t.integer "type_id", null: false
end
create_table "profiles", force: true do |t|
t.integer "user_id", null: false
t.string "first_name", null: false
t.string "last_name", null: false
t.string "gender"
t.string "email"
t.text "bio"
t.decimal "latitude", precision: 10, scale: 8
t.decimal "longitude", precision: 11, scale: 8
t.string "image", limit: 2000
t.datetime "updated_at"
t.datetime "created_at"
t.datetime "deleted_at"
end
create_table "replies", force: true do |t|
t.integer "pin_id", null: false
t.integer "user_id", null: false
t.text "reply", null: false
t.datetime "updated_at"
t.datetime "created_at"
t.datetime "deleted_at"
end
create_table "saves", force: true do |t|
t.integer "pin_id", null: false
t.integer "user_id", null: false
t.datetime "updated_at"
t.datetime "created_at"
t.datetime "deleted_at"
end
create_table "settings", force: true do |t|
t.integer "user_id", null: false
t.boolean "show_email", null: false
t.boolean "show_telephone", null: false
t.integer "timezone", null: false
t.datetime "updated_at"
t.datetime "created_at"
t.datetime "deleted_at"
end
create_table "types", force: true do |t|
t.string "title", null: false
end
create_table "users", force: true do |t|
t.string "provider", limit: 45, null: false
t.string "provider_id", limit: 45, null: false
t.string "oauth_token", limit: 1000
t.datetime "oauth_expires_at"
t.datetime "updated_at"
t.datetime "created_at"
t.datetime "deleted_at"
end
end
生成查看源
<form accept-charset="UTF-8" action="/pins" method="post"><div style="margin:0;padding:0;display:inline"><input name="utf8" type="hidden" value="✓" /><input name="authenticity_token" type="hidden" value="3VO3kVR/62JFf6dJs+yyPTPvYJb3fsUSLRFljSE0Jdk=" /></div>
<div class="small-12 columns">
<label for="pin_title">Title</label>
<input id="pin_title" name="pin[title]" type="text" />
</div>
<div class="small-12 columns">
<label for="pin_description">Description</label>
<textarea id="pin_description" name="pin[description]" rows="10">
</textarea>
</div>
<div class="small-12 columns">
<label for="pin_type">Type</label>
<select id="pin_type_id" name="pin[type_id]"><option value="2">Available</option>
<option value="1">Wanted</option></select>
</div>
<div class="small-12 columns">
<label for="pin_genres">Genres</label>
<input name="pin[genre_ids][]" type="hidden" value="" /><select id="pin_genre_ids" multiple="multiple" name="pin[genre_ids][]"><option value="5">Ambient</option>
<option value="4">Electronic</option>
<option value="2">Indie</option>
<option value="3">Jazz</option>
<option value="6">Metal</option>
<option value="1">Rock</option></select>
</div>
<div class="small-12 columns">
<input class="button" name="commit" type="submit" value="Create Pin" />
</div>
</form>
你可以發佈你的引腳控制器的'新'方法嗎? – Pavan
引腳控制器中的'新'動作只是空白,因爲它所做的只是加載視圖。 –
你可以發佈你的'genre_pin'Active Record Migration文件嗎? – Pavan