[英]How to associate Rails models before one has saved
我正在嘗試構建博客應用,並且正在使用Trix文本編輯器和CarrierWave。
Trip編輯器允許您將圖像拖到文本區域,並且通過使用以下代碼將圖像發布到其自己的BlogImages控制器和模型中,我設法使圖像上載成功:
#blog_images_controller.rb:
def create
@image = BlogImage.create(image_params)
@image.image = params[:image]
respond_to do |format|
if @image.save
format.json { render :json => { url: @image.image.url } }
end
end
end
private
def image_params
params.require(:image).permit(:image)
end
#blog_images.coffee:
(->
host = undefined
uploadAttachment = undefined
document.addEventListener 'trix-attachment-add', (event) ->
attachment = undefined
attachment = event.attachment
if attachment.file
return uploadAttachment(attachment)
return
host = '/blog_images'
uploadAttachment = (attachment) ->
file = undefined
form = undefined
xhr = undefined
file = attachment.file
form = new FormData
form.append 'Content-Type', file.type
form.append 'image[image]', file
xhr = new XMLHttpRequest
xhr.open 'POST', host, true
xhr.upload.onprogress = (event) ->
progress = undefined
progress = event.loaded / event.total * 100
attachment.setUploadProgress progress
xhr.onload = ->
href = undefined
url = undefined
url = href = JSON.parse(@responseText).url
attachment.setAttributes
url: url
href: href
xhr.send form
return
).call this
我現在的問題是我有一個保存的BlogImage,但是尚未創建需要與之關聯的博客,因此無法建立此關聯。 我是Rails的新手,所以任何指導都很棒。
您可能希望使用嵌套屬性將Blog與BlogImage同時保存。 您需要確保在每個模型(Blog和BlogImage)中正確設置了兩個模型之間的關聯。
在您的Blog
模型中:
has_many :blog_images
在您的BlogImage
模型中:
belongs_to :blog
在Blog模型中添加accepts_nested_attributes_for :blog_images
更改BlogController的強參數以接受嵌套屬性,如下所示:
def params
params.require(:blog).permit(:title, :body, :published_on, blog_images_attributes: [:image_url, :another_image_attribute])
end
然后,當您保存Blog記錄時,嵌套在其中的所有BlogImage也會被關聯並保存。
此過程有很多部分,因此我將檢查一下這樣的教程: http : //tutorials.pluralsight.com/ruby-ruby-on-rails/ruby-on-rails-nested-attributes
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