Question

我正在开一家网上时装店。我有一个分类模型和一个大小模型。模型可以有许多尺寸。大小可以有很多类别。

因此我通过关联使用has_many。类别模型和尺寸模型将通过名为category_sizes的表链接。

我将创建一系列尺寸，如XS，Small，Medium。然后我将创建一个类别让我们说衬衫然后我可以选择衬衫将拥有的所有尺寸。然后单击创建。

如何在我的视图中显示尺寸？我试了几个小时。

类别模型

class Category < ActiveRecord::Base
  has_ancestry
  has_many :items
  validates :name, presence: true, length: { maximum: 20 }
  has_many :category_sizes
  has_many :sizes, through: :category_sizes
end

尺寸模型

class Size < ActiveRecord::Base
    validates :title, presence: true, length: { maximum: 15 }
    validates :title, uniqueness: true
  has_many :category_sizes
  has_many :categories, through: :category_sizes
end

category_size模型

class CategorySize < ActiveRecord::Base
  belongs_to :category
  belongs_to :sizes
end

这是我的表格。

<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 :category_sizes %>
                <%= f.collection_select :parent_id, Category.order(:name), :id, :name, {prompt: "Select Parrent ID If Applicable"},include_blank: true %>
                <div class="form-actions"><%= f.button :submit %></div>
            </div>
          <% end %>
        </div>
      </div>
    </div>
  </div>
</div>

模式

ActiveRecord::Schema.define(version: 20150915113019) 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
  end

  add_index "categories", ["ancestry"], name: "index_categories_on_ancestry"

  create_table "category_sizes", force: :cascade do |t|
    t.integer  "category_id"
    t.integer  "size_id"
    t.datetime "created_at",  null: false
    t.datetime "updated_at",  null: false
  end

  add_index "category_sizes", ["category_id"], name: "index_category_sizes_on_category_id"
  add_index "category_sizes", ["size_id"], name: "index_category_sizes_on_size_id"

  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
  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

Answer 1

你尝试过这样的事吗？

<%= f.select(:size_id, Size.all.map {|s| [s.title, s.id]}) %>

Answer 2

在你的控制器定义中，

@size_variant_array = @category.sizes

在您看来，

<%= select_tag 'size',options_for_select(@size_variant_array.collect{ |pv| [pv.title, pv.id] }) ,:prompt => "Please Select"%>

has_many通过协会

2 个答案: