強參數和嵌套屬性

我從Rails 3升級到4，所以我採用了強大的參數。看起來嵌套屬性沒有被成功傳遞。我已經閱讀了幾個相關的SO問題和博客文章，我仍然難住。強參數和嵌套屬性

一個Event有很多Occurrences。當我提交表單以創建新的Event和一個或多個Occurrences時，我得到「1個錯誤禁止保存此類：發生的起點不能爲空。」然而，start是不空白，我確認通過查看張貼的參數：

{"utf8"=>"✓", 
"authenticity_token"=>"aPRLtUbjW7EMxO2kWSzCEctHYZgvBvwuk2QUymfiwkM=", 
"event"=>{"name"=>"some name", 
"photo"=>#<ActionDispatch::Http::UploadedFile:0x007f9e9bc95310 @tempfile=# <File:/var/folders/rz/1p7tmbmj2t5fbfv2wjhvwcsh0000gn/T/RackMultipart20140927-52743-10pcxtg>, 
@original_filename="10435871_671176211140_3488560836686101357_n.jpg", 
@content_type="image/jpeg", 
@headers="Content-Disposition: form-data; name=\"event[photo]\"; filename=\"10435871_671176211140_3488560836686101357_n.jpg\"\r\nContent-Type: image/jpeg\r\n">, 
"summary"=>"", 
"facebook_event_link"=>"", 
"occurrences_attributes"=>{"0"=>{"start"=>"09/30/2014", 
"_destroy"=>"0"}}, 
"special"=>"0", 
"prose"=>""}, 
"commit"=>"Create Event"}

下面是模型和控制器的相關章節。

應用程序/模型/ event.rb：

class Event < ActiveRecord::Base 

    has_many :occurrences, :dependent => :destroy 
    accepts_nested_attributes_for :occurrences, allow_destroy: true, reject_if: proc {|o| o[:start].blank? }

應用程序/模型/ occurrence.rb：

class Occurrence < ActiveRecord::Base 
    belongs_to :event 

    validates_presence_of :start

應用程序/控制器/ events_controller.rb：

class EventsController < ApplicationController 

    def new 
    @event = Event.new 
    @event.occurrences.build 
    @event.passes.build 
    end 

    def create 
    @event = Event.create(event_params) 

    if @event.save 
     redirect_to @event, notice: 'Event was successfully created.' 
    else 
     render :action => "new" 
    end 
    end 

    ... 

    private 

    def event_params 
     params.require(:event).permit(
     :name, :expiration, :prose, :special, :summary, :photo, :link, :price, :student_price, :registration_switch, :facebook_event_link, 
     :occurrences_attributes => [:id, :start, :end, :_destroy]) 
    end 
end

爲什麼是不是有關正在通過正確傳遞的信息？

來源

2014-09-27 Dan Allan

我不確定，但我認爲強參數要求您在相關模型上允許使用外鍵。那麼，也許你在你的occurrences_attributes中缺少event_id？

甚至還沒有接近100％肯定，但是這可能是它：

def event_params 
    params.require(:event).permit(
    :name, :expiration, :prose, :special, :summary, :photo, :link, :price, :student_price, :registration_switch, :facebook_event_link, 
    :occurrences_attributes => [:id, :start, :end, :_destroy, :event_id]) 
end

來源

2014-09-27 13:47:22 Aaron

也許你需要確保你的窗體有multipart: true

來源

2014-09-27 14:02:34 Benj

強參數和嵌套屬性

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