[英]Rails 4 belongs_to/has_many relationship not working
我已经设法建立了一些HABTM关系,没有任何问题,但是由于某些原因,我无法使belongs_to / has_many关系记录这些值。
所以不确定我要去哪里。 这是所有相关的位,从数据库开始。
从schema.db:
create_table "articles", force: :cascade do |t|
t.string "headline"
t.string "lede"
t.text "body"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.integer "type_id"
end
create_table "types", force: :cascade do |t|
t.string "name"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
然后是模型:
class Article < ActiveRecord::Base
has_and_belongs_to_many :categories
has_and_belongs_to_many :regions
has_and_belongs_to_many :stories
belongs_to :type
end
class Type < ActiveRecord::Base
has_many :articles
end
和文章控制器:
# GET /articles/new
def new
@article = Article.new
@regions = Region.all.order(:region)
@categories = Category.all.order(:category)
@stories = Story.all.order(:story)
@types = Type.all.order(:name)
end
# GET /articles/1/edit
def edit
@regions = Region.all.order(:region)
@categories = Category.all.order(:category)
@stories = Story.all.order(:story)
@types = Type.all.order(:name)
end
# POST /articles
# POST /articles.json
def create
@article = Article.new(article_params)
respond_to do |format|
if @article.save
format.html { redirect_to @article, notice: 'Article was successfully created.' }
format.json { render :show, status: :created, location: @article }
else
format.html { render :new }
format.json { render json: @article.errors, status: :unprocessable_entity }
end
end
end
/* …and then at the bottom… */
def article_params
params.require(:article).permit(:headline, :lede, :body, :category_ids => [], :region_ids => [], :story_ids => [], :type_id => [])
end
最后是文章形式:
<strong>Type:</strong> <%= f.collection_select :type_id, @types, :id, :name %>
有任何想法吗?
您需要将article_params
更改为以下内容
def article_params
params.require(:article).permit(:headline, :lede, :body, :type_id, :category_ids => [], :region_ids => [], :story_ids => [])
end
注意将:type_id => []
更改为:type_id
由于每个文章记录中只有一个type_id,因此您所需的参数不应包含type_id数组。 因此将其更改为:type_id而不是:type_id => []
def article_params
params.require(:article).permit(:headline, :lede, :body, :type_id, :category_ids => [], :region_ids => [], :story_ids => [])
end
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