Büroklammer Verschachtelte Attribute auf polymorphem Modell werden nicht gespeichert (RAILS)

Question

Ich kann nicht für das Leben von mir herauszufinden, warum bestimmte Attribute meiner Büroklammer Anlage nicht über verschachtelte Attribute in der Datenbank gespeichert werden. Mein Post hat eine Anlage, aber die Medienparameter für das Attribut: Anlage werden nicht gespeichert, aber das Anlageobjekt wird erstellt. Ich glaube, ich habe etwas mit der Art und Weise, wie meine starken Params überfahren werden, vermasselt. Danke im Voraus.

NIL Params

media_file_name: nil, media_content_type: nil, media_file_size: nil, media_updated_at: nil> 

IRB:

irb(main):001:0> p = Post.last 
     Post Load (0.1ms) SELECT "posts".* FROM "posts" ORDER BY "posts"."id" DESC LIMIT 1 
    => #<Post id: 40, body: "test info", expiration: 1467065130586, created_at: "2016-06-27 21:05:41", updated_at: "2016-06-27 21:05:41"> 
    irb(main):002:0> p.attachment 
     Attachment Load (0.2ms) SELECT "attachments".* FROM "attachments" WHERE "attachments"."attachable_id" = ? AND "attachments"."attachable_type" = ? LIMIT 1 [["attachable_id", 40], ["attachable_type", "Post"]] 
    => #<Attachment id: 26, attachable_id: 40, attachable_type: "Post", created_at: "2016-06-27 21:05:41", updated_at: "2016-06-27 21:05:41", media_file_name: nil, media_content_type: nil, media_file_size: nil, media_updated_at: nil> 
    irb(main):003:0> 

Schema:

ActiveRecord::Schema.define(version: 20160627165514) do 

    create_table "attachments", force: :cascade do |t| 
    t.integer "attachable_id" 
    t.string "attachable_type" 
    t.datetime "created_at",   null: false 
    t.datetime "updated_at",   null: false 
    t.string "media_file_name" 
    t.string "media_content_type" 
    t.integer "media_file_size" 
    t.datetime "media_updated_at" 
    end 

    add_index "attachments", ["attachable_type", "attachable_id"], name: "index_attachments_on_attachable_type_and_attachable_id" 

    create_table "posts", force: :cascade do |t| 
    t.text  "body" 
    t.integer "expiration", limit: 8 
    t.datetime "created_at",   null: false 
    t.datetime "updated_at",   null: false 
    end 

end 

Beitrag Modell:

class Post < ActiveRecord::Base 
    has_one :attachment, as: :attachable, dependent: :destroy 
    accepts_nested_attributes_for :attachment 
end 

Beitrag Controller:

class PostsController < ApplicationController 

    def show 
     #I don't need this. 
    end 

    def index 
     @posts = Post.all 
    end 

    def new 
     @post = Post.new 
     @post.build_attachment 
    end 

    def create 
     @post = Post.new(post_params) 
     @post.build_attachment 
     if @post.save 
      respond_to do |format| 
       format.html {redirect_to(posts_path, notice:"Post succesfully created")} 
       format.js 
      end 
     else 
      render :new 
     end 
    end 


    private 

    def post_params 
     params.require(:post).permit(:body,:expiration, attachment_attributes: [:media]) 
    end 


end 

Befestigung Modell:

class Attachment < ActiveRecord::Base 

    belongs_to :attachable, polymorphic:true 
    has_attached_file :media 
end 

HTML FORM:

<%=form_for(@post, url: posts_path, html:{multipart:true}) do |form|%> 
     <%=form.text_area :body%> 

     <%=fields_for(:attachment) do |ff|%> 
      <%= ff.file_field :media %> 
     <%end%> 


    <%=form.hidden_field :expiration%> 
    <%=form.submit "Post", class: "post-submit-button"%> 



<%end%> 

Log Dumb:

Started POST "/posts" for ::1 at 2016-06-27 16:05:41 -0500 
Processing by PostsController#create as HTML 
    Parameters: {"utf8"=>"✓", "authenticity_token"=>"/b54OJOBJIaR551MAHDujCxjciI7OAx93EQAVrugCz0xtYnafaSH4widYOftZJUbDHLfmI6jly5eG5AxCCNJbQ==", "post"=>{"body"=>"test info", "expiration"=>"1467065130586"}, "attachment"=>{"media"=>"IMG_1004.jpg"}, "commit"=>"Post"} 
    (0.1ms) begin transaction 
    SQL (0.3ms) INSERT INTO "posts" ("body", "expiration", "created_at", "updated_at") VALUES (?, ?, ?, ?) [["body", "test info"], ["expiration", 1467065130586], ["created_at", "2016-06-27 21:05:41.321484"], ["updated_at", "2016-06-27 21:05:41.321484"]] 
    SQL (0.1ms) INSERT INTO "attachments" ("attachable_type", "attachable_id", "created_at", "updated_at") VALUES (?, ?, ?, ?) [["attachable_type", "Post"], ["attachable_id", 40], ["created_at", "2016-06-27 21:05:41.323335"], ["updated_at", "2016-06-27 21:05:41.323335"]] 
    (1.4ms) commit transaction 
Redirected to http://localhost:3000/posts 
Completed 302 Found in 8ms (ActiveRecord: 1.9ms) 


Started GET "/posts" for ::1 at 2016-06-27 16:05:41 -0500 
Processing by PostsController#index as HTML 
    Rendered layouts/_user_menu.html.erb (0.1ms) 
    Rendered posts/index.html.erb within layouts/application (1.8ms) 
Completed 200 OK in 26ms (Views: 25.8ms | ActiveRecord: 0.0ms) 

Answer 1

Sie sind nicht Ihre fields_for Bindung deine Form. Versuchen Sie dies:

<%=form_for(@post, url: posts_path, html:{multipart:true}) do |form|%> 
    <%=form.text_area :body%> 
    <%= form.fields_for(:attachment) do |ff|%> 
    <%= ff.file_field :media %> 
    <% end %> 
    <%=form.hidden_field :expiration%> 
    <%=form.submit "Post", class: "post-submit-button"%> 
<%end%>