您好我有一个分类视图。您可以创建一个类别，如“衬衫”，然后从已经制作的尺寸中选择，如XS，S，M，大。当你创建一个新的类别时，nill会出现。
应该选择所有类别。
见下面size_id：nil
2.2.1 :006 > Category.last
Category Load (0.4ms) SELECT "categories".* FROM "categories" ORDER BY "categories"."id" DESC LIMIT 1
=> #<Category id: 30, name: "test", ancestry: "20", created_at: "2015-09-14 11:09:07", updated_at: "2015-09-14 11:09:07", size_id: nil>
当我使用以下代码时，它会传递id <%= f.collection_select :size_id, Dize.order(:title), :id, :title, {prompt: "Select Parrent ID If Applicable"},include_blank: true %>，所以我知道问题与我的表单有关。
我的观点。我使用简单的形式宝石。所以我目前正在使用<%= f.association :sizes %>
<div class="container">
<div class=“row”>
<div class="col-md-6 col-md-offset-3">
<div class="panel panel-primary">
<div class="panel-body">
<%= simple_form_for(@category) do |f| %>
<div class="form-inputs">
<%= f.input :name %>
<%= f.association :sizes %>
<%= f.collection_select :parent_id, Category.order(:name), :id, :name, {prompt: "Select Parrent ID If Applicable"},include_blank: true %>
</div>
<div class="form-actions"><%= f.button :submit %></div>
<% end %>
</div>
</div>
</div>
</div>
</div>
类别控制器。
class CategoriesController < ApplicationController
before_action :set_category, only: [:show]
before_action :admin_user, only: [:destroy, :index, :edit, :show]
def index
@categories = Category.all
end
def show
@tags = Item.where(category_id: @category.id).tag_counts_on(:tags)
if params[:tag]
@items = Item.tagged_with(params[:tag])
else
@items = Item.where(category_id: @category.id).order("created_at DESC")
end
end
def new
@category = Category.new
end
def edit
@category = Category.find(params[:id])
end
def create
@category = Category.new(category_params)
if @category.save
redirect_to @category
flash[:success] = "You have created a new category"
else
flash[:danger] = "Your category didn't save"
render "new"
end
end
def update
@Cateogry = Category.find(params[:id])
if @Cateogry.update(category_params)
redirect_to @Cateogry
flash[:success] = 'Category was successfully updated.'
else
render "edit"
end
end
def destroy
Category.find(params[:id]).destroy
flash[:success] = "Category deleted"
redirect_to categories_path
end
private
def set_category
@category = Category.find(params[:id])
end
def category_params
params.require(:category).permit(:name, :parent_id, :size_id)
end
# Confirms an admin user.
def admin_user
redirect_to(root_url) unless current_user.try(:admin?)
end
end
我的计划
ActiveRecord::Schema.define(version: 20150914095836) do
create_table "categories", force: :cascade do |t|
t.string "name"
t.string "ancestry"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.integer "size_id"
end
add_index "categories", ["ancestry"], name: "index_categories_on_ancestry"
create_table "items", force: :cascade do |t|
t.string "title"
t.decimal "price"
t.text "description"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.integer "user_id"
t.string "image_file_name"
t.string "image_content_type"
t.integer "image_file_size"
t.datetime "image_updated_at"
t.integer "category_id"
end
add_index "items", ["user_id", "created_at"], name: "index_items_on_user_id_and_created_at"
add_index "items", ["user_id"], name: "index_items_on_user_id"
create_table "sizes", force: :cascade do |t|
t.text "title"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.integer "category_id"
end
create_table "taggings", force: :cascade do |t|
t.integer "tag_id"
t.integer "taggable_id"
t.string "taggable_type"
t.integer "tagger_id"
t.string "tagger_type"
t.string "context", limit: 128
t.datetime "created_at"
end
add_index "taggings", ["tag_id", "taggable_id", "taggable_type", "context", "tagger_id", "tagger_type"], name: "taggings_idx", unique: true
add_index "taggings", ["taggable_id", "taggable_type", "context"], name: "index_taggings_on_taggable_id_and_taggable_type_and_context"
create_table "tags", force: :cascade do |t|
t.string "name"
t.integer "taggings_count", default: 0
end
add_index "tags", ["name"], name: "index_tags_on_name", unique: true
create_table "users", force: :cascade do |t|
t.string "username"
t.string "email"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.string "password_digest"
t.string "remember_digest"
t.boolean "admin", default: false
t.string "activation_digest"
t.boolean "activated", default: false
t.datetime "activated_at"
t.string "reset_digest"
t.string ">"
t.datetime "reset_sent_at"
t.string "avatar_file_name"
t.string "avatar_content_type"
t.integer "avatar_file_size"
t.datetime "avatar_updated_at"
t.text "description"
end
add_index "users", ["email"], name: "index_users_on_email", unique: true
end
服务器日志
Started POST "/categories" for ::1 at 2015-09-14 22:22:52 +1000
Processing by CategoriesController#create as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"HTiUBJc6PNI+CTOKZ8c6Zb1oOYpdfnlwju9IxTAcDJxcNVerkeE/3YEISy04QW1eOxpVWSUfO4D/CPV5srxdIg==", "category"=>{"name"=>"test032", "size_ids"=>["", "1"], "parent_id"=>"20"}, "commit"=>"Create Category"}
Unpermitted parameter: size_ids
Category Load (0.1ms) SELECT "categories".* FROM "categories" WHERE "categories"."id" = ? LIMIT 1 [["id", 20]]
(0.1ms) begin transaction
SQL (0.3ms) INSERT INTO "categories" ("name", "ancestry", "created_at", "updated_at") VALUES (?, ?, ?, ?) [["name", "test032"], ["ancestry", "20"], ["created_at", "2015-09-14 12:22:52.177014"], ["updated_at", "2015-09-14 12:22:52.177014"]]
(0.9ms) commit transaction
Redirected to http://localhost:3000/categories/36
Completed 302 Found in 5ms (ActiveRecord: 1.4ms)
Started GET "/categories/36" for ::1 at 2015-09-14 22:22:52 +1000
Processing by CategoriesController#show as HTML
Parameters: {"id"=>"36"}
Category Load (0.1ms) SELECT "categories".* FROM "categories" WHERE "categories"."id" = ? LIMIT 1 [["id", 36]]
User Load (0.1ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1 [["id", 53]]
(0.4ms) SELECT COUNT(*) FROM "tags" JOIN (SELECT taggings.tag_id, COUNT(taggings.tag_id) AS tags_count FROM "taggings" INNER JOIN items ON items.id = taggings.taggable_id WHERE (taggings.taggable_type = 'Item' AND taggings.context = 'tags') AND (taggings.taggable_id IN(SELECT items.id FROM "items" WHERE "items"."category_id" = 36)) GROUP BY taggings.tag_id HAVING COUNT(taggings.tag_id) > 0) AS taggings ON taggings.tag_id = tags.id
Item Load (0.1ms) SELECT "items".* FROM "items" WHERE "items"."category_id" = ? ORDER BY created_at DESC [["category_id", 36]]
Rendered categories/show.html.erb within layouts/application (1.7ms)
Rendered layouts/_header.html.erb (0.7ms)
Rendered layouts/_footer.html.erb (0.1ms)
Completed 200 OK in 262ms (Views: 258.8ms | ActiveRecord: 0.7ms)
ROR的Paras
Started POST "/categories" for ::1 at 2015-09-14 22:44:10 +1000
Processing by CategoriesController#create as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"CUvynavkQgbHolVu67aEyQh1UM5uFhsAts50/wylFyNIRjEyrT9BCXijLcm0MNPyjgc8HRZ3WfDHKclDjgVGnQ==", "category"=>{"name"=>"Test12", "size_ids"=>["", "1"], "parent_id"=>"20"}, "commit"=>"Create Category"}
Unpermitted parameter: size_ids
Category Load (0.1ms) SELECT "categories".* FROM "categories" WHERE "categories"."id" = ? LIMIT 1 [["id", 20]]
(0.1ms) begin transaction
SQL (0.4ms) INSERT INTO "categories" ("name", "ancestry", "created_at", "updated_at") VALUES (?, ?, ?, ?) [["name", "Test12"], ["ancestry", "20"], ["created_at", "2015-09-14 12:44:10.007917"], ["updated_at", "2015-09-14 12:44:10.007917"]]
(0.7ms) commit transaction
Redirected to http://localhost:3000/categories/39
Completed 302 Found in 5ms (ActiveRecord: 1.2ms)
Started GET "/categories/39" for ::1 at 2015-09-14 22:44:10 +1000
Processing by CategoriesController#show as HTML
Parameters: {"id"=>"39"}
Category Load (0.1ms) SELECT "categories".* FROM "categories" WHERE "categories"."id" = ? LIMIT 1 [["id", 39]]
User Load (0.1ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1 [["id", 53]]
(0.4ms) SELECT COUNT(*) FROM "tags" JOIN (SELECT taggings.tag_id, COUNT(taggings.tag_id) AS tags_count FROM "taggings" INNER JOIN items ON items.id = taggings.taggable_id WHERE (taggings.taggable_type = 'Item' AND taggings.context = 'tags') AND (taggings.taggable_id IN(SELECT items.id FROM "items" WHERE "items"."category_id" = 39)) GROUP BY taggings.tag_id HAVING COUNT(taggings.tag_id) > 0) AS taggings ON taggings.tag_id = tags.id
Item Load (0.1ms) SELECT "items".* FROM "items" WHERE "items"."category_id" = ? ORDER BY created_at DESC [["category_id", 39]]
Rendered categories/show.html.erb within layouts/application (1.7ms)
Rendered layouts/_header.html.erb (0.6ms)
Rendered layouts/_footer.html.erb (0.0ms)
Completed 200 OK in 247ms (Views: 243.4ms | ActiveRecord: 0.8ms)
分类模型。
class Category < ActiveRecord::Base
has_ancestry
has_many :items
has_many :sizes
validates :name, presence: true, length: { maximum: 20 }
end
尺寸模型
class Size < ActiveRecord::Base
validates :title, presence: true, length: { maximum: 15 }
validates :title, uniqueness: true
belongs_to :category
end
答案 0 :(得分：0)
<%= f.association :size, collection: Size.all, label_method: title, as: :select %>
更改大小的选择标记并检查。