Rails 3.1：将project_id与新上传的图像相关联

Question

我正在上传图像，并希望将其与当前项目相关联。我位于URL example.com/projects/1的项目中并呈现此内容形式：

<%= semantic_form_for @image, :html => { :multipart => true } do |f|%> 
    <%= f.semantic_errors %> 
    <%= f.inputs do %> 
    <%= f.input :title %> 
    <%= f.input :description %> 
    <%= f.input :image, :as => :file %> 
    <% end %> 
    <%= f.buttons do %> 
    <%= f.commit_button :label => 'Upload Image', :button_html => { :class => "btn primary" } %> 
    <% end %> 
<% end %> 

我在image.rb模型，belongs_to :project和project.rb模型设定，has_many :images

我images_controller.rb创建方法是这样的：

def create 
    image = params[:image] 
    if user_signed_in? 
    @image = Image.new(:title => image[:title], 
         :description => image[:description], 
         :user_id => current_user.id, 
         :project_id => params[:id]) 
    if @image.save 
    flash[:success] = "Successfully uploaded an image" 
    redirect_to project_path(params[:id]) and return 
    else 
    flash[:error] = "Error with image upload" 
    redirect_to new_image_path and return 
    end 
else 
    redirect_to root_path 
end  
end 

图像已创建，但未能将图像与project_id关联。我知道问题是params[:id]没有拉入project_id，我该如何从网址中提取项目ID并将其与图片关联？

Answer 1

您应该使用您的关联来创建新的图像。

@image = Project.find(params[:id]).images.create(:title => image[:title], 
        :description => image[:description], 
        :user => current_user) 
if @image.save... 

如果这不起作用，请张贴您的routes.rb的内容和从发布请求中选中的url。