我跟随Michael Hartl的教程学习,并想要在微博中添加照片。但是当我提交微博时,图片没有保存在数据库中,在开发日志中我可以看到未被允许的参数:image。我查看了其他帖子并遵循他们的建议,但对我来说没有用。
模型
micropost.rb
class Micropost < ActiveRecord::Base
belongs_to :user
has_one :photo
default_scope -> { order('created_at DESC') }
validates :content, presence: true, length: { maximum: 140 }
validates :user_id, presence: true
end
photo.rb
class Photo < ActiveRecord::Base
belongs_to :micropost
has_attached_file :image
end
CONTROLLERS
photos_controller.rb
class PhotosController < ApplicationController
before_action :signed_in_user, only: [:create, :destroy, :index]
def create
@photo = Photo.new(photo_params)
respond_to do |format|
if @photo.save
format.html { redirect_to @photo, notice: 'Photo was successfully created.' }
format.json { render action: 'static_pages/home', status: :created, location: @photo }
else
format.html { render action: 'static_pages/home' }
format.json { render json: @photo.errors, status: :unprocessable_entity }
end
end
end
private
def photo_params
params.require(:photo).permit(:image)
end
end
microposts_controller.rb
class MicropostsController < ApplicationController
before_action :signed_in_user, only: [:create, :destroy]
def create
@micropost = current_user.microposts.build(micropost_params)
if @micropost.save
flash[:success] = "Micropost created!"
redirect_to root_url
else
@feed_items = []
render 'static_pages/home'
end
end
private
def micropost_params
params.require(:micropost).permit(:content, photo_attributes: [:photo_id, :image])
end
end
视图
_micropost_form.html.erb 我不知道如何构建这个表单,我已经尝试了很多不同的构造方式
<%= form_for(@micropost) do |f| %>
<%= render 'shared/error_messages', object: f.object %>
<div class="field">
<%= f.text_area :content, placeholder: "Compose new micropost..." %>
</div>
<%= f.fields_for :image, :html => { :multipart => true } do |builder| %>
<%= f.file_field :image, :f => builder %>
<% end %>
<%= f.submit "Post", class: "btn btn-large btn-primary" %>
<% end %>
当我想提交表格时,一切都正常,但“photo_id”列为空。而且照片没有保存到数据库中。
服务器日志
Started POST "/microposts" for 127.0.0.1 at 2013-11-27 15:06:06 +0100
Processing by MicropostsController#create as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"<my_private_token>", "micropost"=>{"content"=>"Hello world", "image"=>#<ActionDispatch::Http::UploadedFile:0x00000003401a48 @tempfile=#<Tempfile:/tmp/RackMultipart20131127-4010-1r6qt80>, @original_filename="paint.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"micropost[image]\"; filename=\"paint.jpg\"\r\nContent-Type: image/jpeg\r\n">}, "commit"=>"Post"}
[1m[36mUser Load (0.2ms)[0m [1mSELECT "users".* FROM "users" WHERE "users"."remember_token" = '342df8f039f7f40698b3691f77d2539dc8b9c101' LIMIT 1[0m
Unpermitted parameters: image
[1m[35m (0.1ms)[0m begin transaction
[1m[36mSQL (0.4ms)[0m [1mINSERT INTO "microposts" ("content", "created_at", "updated_at", "user_id") VALUES (?, ?, ?, ?)[0m [["content", "Hello world"], ["created_at", Wed, 27 Nov 2013 14:06:06 UTC +00:00], ["updated_at", Wed, 27 Nov 2013 14:06:06 UTC +00:00], ["user_id", 101]]
[1m[35m (145.1ms)[0m commit transaction
Redirected to http://localhost:3000/
Completed 302 Found in 153ms (ActiveRecord: 145.7ms)
我现在完全被卡住了,如果你能找到一些可以帮助我的东西,告诉我在哪里找到解决方案,非常感谢!!!
{:micropost => {:image => ...}}
,所以你需要params.require(:micropost).permit(:content, :image, ...)
。 - Farley Knightdef micropost_params params.require(:micropost).permit(:content, photo_attributes: [:photo_id, :image, image_file_name, :image_content_type, :image_file_size, :image_update_at]) end
,但是仍然没有允许:image。 - 2ueenO