Cannot Attach photo using paperclip on rails 4?

Question

Here is my controller

class ArticlesController < ApplicationController
def new
    @article=Article.new

end
def index
    @articles = Article.all
end
def create
    @article = Article.new(article_params)
    if @article.save
        redirect_to @article
    else
        render 'new'
    end
end
def show
    @article = Article.find(params[:id])
end  
def edit
      @article = Article.find(params[:id])


end
def update
@article = Article.find(params[:id])

if @article.update(article_params)
redirect_to @article
else
  render 'edit'
end
end
def destroy
@article = Article.find(params[:id])
@article.destroy

redirect_to articles_path
end
private
    def article_params
    params.require(:article).permit(:title, :text)
end

end

Here's my form

<%= form_for @article, :html => { :multipart => true } do |f| %>
<% if @article.errors.any? %>
 <div id="error_explanation">
   <h2><%= pluralize(@article.errors.count, "error") %> prohibited this article from being saved:</h2>
<ul>
<% @article.errors.full_messages.each do |msg| %>
  <li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<p>
<%= f.label :title %><br>
<%= f.text_field :title %>
</p>

<p>
<%= f.label :text %><br>
<%= f.text_area :text %>
</p>
<p>
<%= f.file_field :photo %>
</p>

<p>
<%= f.submit %>
</p>
<% end %>

I am not able to upload the photo infact it does not show any error, but neither anything(path of image) is saved on database nor any photo is saved. I am new on rails, just trying to create a form which have features of uploading photo.

class Article < ActiveRecord::Base
validates :title, presence: true, length: { minimum: 5 }
has_attached_file :photo
validates_attachment :photo, content_type: { content_type: ["image/jpg", "image/jpeg", "image/png"] }
end

I have tried almost every tutorial and also found some of the Similar Problem but it seems nothing has resolved the issue. Please help me out.

Answer 1

You need to add photo to your strong params:

def article_params
    params.require(:article).permit(:title, :text, :photo)
end

Without it the value is not passed over to the model to be validated and saved.

I am assuming you already ran the migration to add Paperclip's photo_file_name, photo_file_size, photo_content_type, photo_updated_at fields to your articles table.

Note: It is only necessary to include the attached file name photo in the strong parameters; as long as this value reaches the model Paperclip will handle the rest.

In addition, you need to disable Paperclip's spoofing validation. It uses the OS file command the determine the MIME type of the file but Windows doesn't have a file command so it always fails. You can disable the spoofing check by putting something like this in an initializer:

module Paperclip
  class MediaTypeSpoofDetector
    def spoofed?
      false
    end
  end
end