I have these association, and i'm using shrine gem to upload file.
class Project < ApplicationRecord
include ImageUploader[:cover_image]
has_many :albums, :dependent => :destroy
accepts_nested_attributes_for :albums,
end
class Album, < ApplicationRecord
belongs_to :project
has_many :photos,
accepts_nested_attributes_for :photos,
end
class Photo < ApplicationRecord
include ImageUploader[:image]
belongs_to :album
end
Project Controller
def show
@project = Project.includes(albums: :photos).find(params[:id])
respond_to do |format|
format.html # show.html.erb
format.js # show.js.erb
format.json { render json: @project }
end
end
I want to display project with all its association and its details (file size, filename etc) in Project#show view. I can display the size for Project cover image with @project.cover_image.size but when i'm using it for photo.image.size throws error
<p>
<%= @project.name %>
<%= @project.cover_image.size %> #this return the size 868923
<p>
<% @project.albums.each do |album| %>
<%= album.name %>
<% album.photos.each do |photo| %>
<%= photo.image.size %> # this throws error !undefined method `size' for nil:NilClass
就像这样:
<%= image_tag @photo.image_url(:small) if @photo.image %>
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