Rails創建新的活動記錄返回false

Question

我有兩個模型：視頻和圖像。

當我創建新視頻時，我想保存視頻縮略圖圖像。我試圖用這個在我的視頻控制器「創造」行動以下行：

newImage = Image.new(:step_id=>@video.step_id, :imagePath=>@video.thumbnail_url, :project_id=>@video.project_id, :saved=> true, :position=>position).save 
logger.debug "newImage #{newImage}" 

眼下，圖像似乎沒有被保存，我不知道我做錯了什麼。以下是我收到的錯誤消息：

ActiveRecord::RecordInvalid (Validation failed: Imagepath can't be blank): 
    app/controllers/videos_controller.rb:35:in `create' 


    Rendered /Users/ttseng/.rvm/gems/ruby-1.9.3-p448/gems/actionpack-3.2.8/lib/action_dispatch/middleware/templates/rescues/_trace.erb (1.0ms) 
    Rendered /Users/ttseng/.rvm/gems/ruby-1.9.3-p448/gems/actionpack-3.2.8/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (0.9ms) 
    Rendered /Users/ttseng/.rvm/gems/ruby-1.9.3-p448/gems/actionpack-3.2.8/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (7.3ms) 

但是，我的日誌清楚地顯示我沒有傳遞空白imagePath（請參見下文）。

這是我的視頻控制器動作：

# POST /videos 
    def create 
    # need to validate 
    @video = Video.create(params[:video]) 
    # get the thumbnail image 
    thumbnail = @video.thumb_url 
    logger.debug "thumbnail video: #{thumbnail}" 
    @video.update_attributes(:thumbnail_url => thumbnail) 

    # create a new image record for the thumbnail 
    logger.debug "creating new image" 
    logger.debug "@video.step_id: #{@video.step_id}" 
    position = Step.find(@video.step_id).images.count # set the position of the added thumbnail to the last 
    logger.debug "position: #{position}" 
    logger.debug "imagePath: #{@video.thumbnail_url}" 
    logger.debug "project_id: #{@video.project_id}" 
    newImage = Image.new(:step_id=>@video.step_id, :imagePath=>@video.thumbnail_url, :project_id=>@video.project_id, :saved=> true, :position=>position).save 
    logger.debug "newImage #{newImage}" 

    respond_to do |format| 
     if @video.save   
     format.js 
     else 
     format.json { render :json => @video.errors, :status => :unprocessable_entity } 
     end 
    end 
    end 

這將返回以下日誌：

Started POST "/videos" for 127.0.0.1 at 2013-07-05 14:09:45 -0400 
Processing by VideosController#create as JS 
    Parameters: {"utf8"=>"✓", "authenticity_token"=>"e5YFBA3CSbeUiVgsimzrw2DlMrQbWNZmMfpYJoGLNCY=", "video"=>{"project_id"=>"108", "step_id"=>"523", "saved"=>"true", "url"=>"http://youtu.be/O9k-MsfIkMY"}, "button"=>""} 
    User Load (0.5ms) SELECT "users".* FROM "users" WHERE "users"."id" = 5 LIMIT 1 
    (0.2ms) BEGIN 
video id: O9k-MsfIkMY 
    SQL (0.9ms) INSERT INTO "videos" ("created_at", "position", "project_id", "saved", "step_id", "thumbnail_url", "updated_at", "url") VALUES ($1, $2, $3, $4, $5, $6, $7, $8) RETURNING "id" [["created_at", Fri, 05 Jul 2013 14:09:45 EDT -04:00], ["position", nil], ["project_id", 108], ["saved", true], ["step_id", 523], ["thumbnail_url", nil], ["updated_at", Fri, 05 Jul 2013 14:09:45 EDT -04:00], ["url", "http://youtu.be/O9k-MsfIkMY"]] 
    (0.4ms) COMMIT 
video id: O9k-MsfIkMY 
thumbnail_url: http://img.youtube.com/vi/O9k-MsfIkMY/default.jpg 
thumbnail video: http://img.youtube.com/vi/O9k-MsfIkMY/default.jpg 
    (0.1ms) BEGIN 
video id: O9k-MsfIkMY 
    (0.3ms) UPDATE "videos" SET "thumbnail_url" = 'http://img.youtube.com/vi/O9k-MsfIkMY/default.jpg', "updated_at" = '2013-07-05 18:09:45.952229' WHERE "videos"."id" = 41 
    (0.4ms) COMMIT 
creating new image 
@video.step_id: 523 
    Step Load (0.3ms) SELECT "steps".* FROM "steps" WHERE "steps"."id" = $1 LIMIT 1 [["id", 523]] 
    (0.4ms) SELECT COUNT(*) FROM "images" WHERE "images"."step_id" = 523 
position: 0 
imagePath: http://img.youtube.com/vi/O9k-MsfIkMY/default.jpg 
project_id: 108 
    (0.1ms) BEGIN 
    (0.1ms) ROLLBACK 
newImage false 
    (0.1ms) BEGIN 
video id: O9k-MsfIkMY 
    (0.1ms) COMMIT 
video id: O9k-MsfIkMY 
    Rendered videos/create.js.erb (0.3ms) 
Completed 200 OK in 26ms (Views: 5.7ms | ActiveRecord: 4.0ms) 

Video.rb：

class Video < ActiveRecord::Base 

    attr_accessible :position, :project_id, :saved, :step_id, :url, :thumbnail_url 

    belongs_to :step 
    belongs_to :project 

    validates :url, url: true 
    validates :url, :presence=> true 
    validates :embed_code, :presence => true 
    validate :url_is_from_approved_site 
    ... 
    end 

Image.rb ：

class Image < ActiveRecord::Base 

    attr_accessible :project_id, :step_id, :imagePath, :caption, :position, :saved 

    belongs_to :step 
    belongs_to :project 

    mount_uploader :imagePath, ImagePathUploader 

    before_create :default_name 

    validates :imagePath, :presence => true 

    def default_name 
    self.imagePath ||= File.basename(imagePath.filename, '.*').titleize if imagePath 
    end 

    def image=(val) 
    if !val.is_a?(String) && valid? 
     image_will_change! 
     super 
    end 
    end 

end 

Answer 1

錯誤結束了，你不能手動覆蓋Carrierwave屬性。相反，我需要使用：remote_image_path_url設置：IMAGE_PATH屬性：

Manually Setting Image Path for Carrierwave Uploader

這從URL通過carrierwave直接上傳圖像（而不是指向的URL圖像）。

Answer 2

您已設置:imagePath，但它應該是:imagepath。 此外，您還可以使用create!方法，而不是new其次save!

Image.create!(:step_id=>@video.step_id, :imagepath=>@video.thumbnail_url, :project_id=>@video.project_id, :saved=> true, :position=>position)