創建形式爲在導軌

形成多個枚舉選擇創建形式爲在導軌

<%= form_for :article, url: articles_path, html: {multipart: true } do |f| %> 

<p> 
<%= f.label :source %><br> 
<%= f.text_field :source %> 
</p> 
<p> 
<%= f.label :title %><br> 
<%= f.text_field :title %> 
</p> 
<p> 
<%= f.label :artwork %><br> 
<%= f.text_field :remote_artwork_url %> 
</p> 

<%= f.select :article_type, Article.article_types.keys, {}, class: 'article-article_type-select' %> 

<p> 
<%= f.submit %> 
</p> 


<% end %>

模型

class Article < ActiveRecord::Base 

enum article_type: [:headline, :news, :editorial, :political, :social, :sports, :food] 
scope :by_type, -> { where(article_type: [0..2, 4]) } 

end

控制器

class ArticlesController < ApplicationController 
def new 
    if current_user.admin != true 
     flash[:danger] = "You are not permitted to sumbit articles!" 
     redirect_to root_url 
    else 
     @article = Article.new 
    end 
    end 

    def show 
    @article = Article.approved.find(params[:id]) 
    end 

    def create 
    if current_user.admin != true 
     redirect_to root_url 
    else 
    @article = current_user.articles.build(article_params) 
    @article.save 
     if @article.errors.any? 
     flash[:danger] = "Article failed!" 
     redirect_to 'new_article_path' 
     else 
     flash[:success] = "Article created!" 
     redirect_to new_article_path 
     end 
    end 
    end 

def index 
    @articles = Article.approved.all 
end 

private 

    def article_params 
    params.require(:article).permit(:artwork, :source, :title, :remote_artwork_url, :article_type) 
    end 

end

架構

create_table "articles", force: :cascade do |t| 
t.string "title" 
t.string "source" 
t.string "artwork" 
t.integer "article_type" 
t.integer "user_id" 
t.datetime "created_at",     null: false 
t.datetime "updated_at",     null: false 
t.boolean "approved",  default: false 
end

我希望能夠爲每篇文章分配多個枚舉。現在我的表單只接受一個枚舉選擇，我不確定是否必須將表/模式更改爲數組以接受多個枚舉選擇。另外，我前一段時間寫了這段代碼，我不再記得{ where(article_type: [0..2, 4]) }的含義。

來源

2016-04-23 Timmy Von Heiss

類型爲enum的列只能分配一個值。這就是他們的觀點。如果您需要存儲多個值，則可能表示數據需要重新構建。

scope :by_type, -> { where(article_type: [0..2, 4]) }

上述查詢獲取與類型0或1或2或4。導致下面的查詢的所有文章

SELECT "articles".* FROM "articles" WHERE ("articles"."id" = 4 OR "articles"."id" BETWEEN 0 AND 2)

來源

2016-04-23 22:06:23 margo

創建形式爲在導軌

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