ruby on rails - Why are Paperclip images coming up as missing.png? -

i know there couple of questions out there on stackoverflow, either went right on head or didn't seem relevant own question.

i working on jumpstartlab's blogger 2 project tutorial , have reached i4 after completing beforehand. tutorial told install paperclip gem, add:

class addpaperclipfieldstoarticle < activerecord::migration   def change     add_column :articles, :image_file_name, :string     add_column :articles, :image_content_type, :string     add_column :articles, :image_file_size, :integer     add_column :articles, :image_updated_at, :datetime   end end 

to new migration database add paperclip fields article (and rake this).

i added code:

has_attached_file :image validates_attachment_content_type :image, :content_type => ["image/jpg", "image/jpeg", "image/png"] 

to apps/models/article.rb, added :image app/helpers/articles_helper.rb

here _form.html.erb

<%= form_for(@article, html: {multipart: true}) |f| %> <ul>     <% @article.errors.full_messages.each |error| %>     <li><%= error %></li>     <% end %> </ul> <p>     <%= f.label :title %><br />     <%= f.text_field :title %> </p> <p>     <%= f.label :body %><br />     <%= f.text_area :body %> </p> <p>     <%= f.label :image, "attach image" %><br />     <%= f.file_field :image %> </p> <p>     <%= f.submit %> </p> <p>     <%= f.label :tag_list %><br />     <%= f.text_field :tag_list %> </p> <% end %> 

why image add changing missing.png? have tried multiple images, changed paperclip older version, output has been same.

thanks in advance.

edit:

view code show.html.erb

<h1><%= @article.title %></h1>  <p><%= image_tag(@article.image.url) %></p>  <p><%= @article.body %></p>  <h3>comments (<%= @article.comments.size %>)</h3>  <%= render partial: 'articles/comment', collection: @article.comments %> <%= render partial: 'comments/form' %>  <%= link_to "<< articles' list", articles_path %>  <%= link_to "delete", article_path(@article), method: :delete, data: {confirm: "really delete article?"} %>  <%= link_to "edit", edit_article_path(@article) %>  <p>     tags:     <% @article.tags.each |tag| %>     <%= link_to tag.name, tag_path(tag) %>     <% end %> </p> 

articles_controller code

class articlescontroller < applicationcontroller include articleshelper def index     @articles = article.all end def show     @article = article.find(params[:id])     @comment = comment.new     @comment.article_id = @article.id end def new     @article = article.new end def create     @article = article.new(article_params)     @article.save      flash.notice = "article '#{@article.title}' created!"      redirect_to article_path(@article) end def destroy     @article = article.find(params[:id])     @article.destroy      flash.notice = "article '#{@article.title}' deleted!"      redirect_to action: 'index' end def edit     @article = article.find(params[:id]) end def update     @article = article.find(params[:id])     @article.update(article_params)      flash.notice = "article '#{@article.title}' updated!"      redirect_to article_path(@article) end end 

why paperclip images coming missing.png? 

this literally describes problem. when article's :image nil, no matter try, show default missing.png because case handled paperclip itself.

however, can use default_url option set custom default image when article's image missing.

alternatively, can use conditional this:

if @article.image_file_name.present?   # makes sure article has image   # show article image else   # show custom default image here end 

update

basically, image uploading not working. make sure have in controller:

def article_params   params.require(:article).permit(:image) end 

i suspect, there validation error when create article. make sure, change create method this:

def create     @article = article.create!(article_params)      flash.notice = "article '#{@article.title}' created!"      redirect_to article_path(@article) end  

using create! instead of new throw exception if there error while creating article , able know exact problem.

try , let me know! if error when using create! while creating article, update question information. image content type validation error. if that's case, add custom validation image , content_type , make sure works. but, see!