我试图建立一个表来处理双方的位置和类别一定的活动已被设置为以下模型协会:Rails的ActiveRecord的:三表的has_many通过:协会
class Campaign < ActiveRecord::Base
has_many :campaign_category_metro_bids, dependent: :destroy
has_many :metros, through: :campaign_category_metro_bids
has_many :categories, through: :campaign_category_metro_bids
end
class Metro < ActiveRecord::Base
has_many :campaign_category_metro_bids
has_many :campaigns, through: :campaign_category_metro_bids
has_many :categories, through: :campaign_category_metro_bids
end
class Category < ActiveRecord::Base
has_many :campaign_category_metro_bids
has_many :campaigns, through: :campaign_category_metro_bids
has_many :metros, through: :campaign_category_metro_bids
end
class CampaignCategoryMetroBid < ActiveRecord::Base
belongs_to :campaign
belongs_to :category
belongs_to :metro
end
当试图创建选择两个不同的城市和类别的结果的活动是空的paramters之一当ID:
建立广告活动代号:
def new
if signed_in?
# create new campaign
@user = User.find(params[:id])
@campaign = @user.campaigns.new
else
redirect_to signin_path
end
end
def create
@campaign = User.find(params["campaign"]["user_id"]).campaigns.build(campaign_params)
if @campaign.save
flash[:success] = "Campaign created!"
redirect_to current_user
else
render 'new'
end
end
修订 视图创建活动采用两个独立collection_select类别和地铁为:
<%= f.collection_select :category_ids, Category.all, :id, :display_category, {}, {multiple: true} %>
和
<%= f.collection_select :metro_ids, Metro.all, :id, :full_name, {}, {multiple: true} %>
campaigns_params:
def campaign_params
params.require(:campaign).permit(:name, :campaign_category_metro_bid_id,
:metro_ids => [], :category_ids => [])
end
有没有更好的方法来允许我尝试创建3表关系? 还是有办法使得所得表类似下面根据活动创建Category
和Metro
机型在选择链接:
你可以从你的控制器中添加广告系列创建代码的方向? – Eric 2014-09-23 01:23:41
@Eric你需要其他信息吗? – Sauron 2014-09-23 01:40:33
是的,你的campaign_params方法:) – Eric 2014-09-23 05:06:32