Getting error while displaying image "Can't resolve image into URL: undefined method `attachment_url' for #<ActionView::Base:0x0000000000b770>"

Question

Here's how my model looks like.

class Bug < ApplicationRecord
    has_many :bug_users, dependent: :destroy
    has_many :users , through: :bug_users  
    belongs_to :project
    has_one_attached :screenshot
end

The uploading part is working just fine but when i am displaying it in the view like this

<% @bugs.each do |bug| %>
<p>
   <strong>Title:</strong>
   <%= bug.title %>
</p>
<p>
<%if bug.screenshot.present? %>
   <strong>Screenshot:</strong>
   <%= image_tag bug.screenshot %>
<%end%>
</p>
<% end%>

I am getting the error

Answer 1

Resolved! its kinda crazy actually i saw a tutorial in which he was generating the model like:

rails g model User avatar:attachment

So, I thought maybe i have to add a column in my model and when i did it gave:

# Could not dump table "bugs" because of following StandardError 
# Unknown type 'attachment' for column 'screenshot'

in my schema.rb but it did resolve the error and then i again ran a migration to remove that column and surprisingly it was still not giving this error.