I have a Product model and an Image model (based on paperclip).
class Product < ActiveRecord::Base
has_many :images, as: :imageable,
dependent: :destroy
accepts_nested_attributes_for :images
end
class Image < ActiveRecord::Base
belongs_to :imageable, polymorphic: true
has_attached_file :picture
end
I want to add image for my products in the same page I create product ( /products/new
). Here is the form :
<%= form_for(@product, html: { multipart: true}) do |f| %>
<%= render 'shared/error_messages', object: f.object %>
<div>
<%= f.label :name, t('product.name') %>
<%= f.text_field :name %>
</div>
<div class="file_field">
<%= f.fields_for :image do |images_form| %>
<%= images_form.file_field :image %>
<% end %>
</div>
<%= f.submit @submit_button %>
<% end %>
Then I go to the /products/new
page, I fill in the fields, and click on the submit button. The server try to renders the product's show page, but it doesn't work because the image has not been saved. I have the following error :
undefined method `picture' for nil:NilClass
for the following line in the product's show page
image_tag(@product.images.first.picture.url(:medium))
I wonder why the image has not be saved and I see that the server renders the following message :
Unpermitted parameters: images_attributes
So I added image attributes in the permit products params ( like there ) :
def product_params
params.require(:product).permit(:name, :sharable, :givable, image_attributes: [:name, :picture_file_name, :picture_content_type, :picture_file_size])
end
But it doesn't change anything, I always have the same error message. Do you have an idea where does the permission issue come from ?
You may need to change
params.require(:product).permit(:name, :sharable, :givable, image_attributes: [:name, :picture_file_name, :picture_content_type, :picture_file_size])
to
params.require(:product).permit(:name, :sharable, :givable, images_attributes: [:name, :picture])
You define a has_many association, so in your view, it should be f.fields_for :images
<%= f.fields_for :images do |images_form| %>
<div class="file_field">
<%= images_form.file_field :picture %>
</div>
<% end %>
In your controller, you should build some images first and add your images_attributes to permitted parameters.
@product = Product.new
3.times {@product.images.build}
your view will show 3 file fields.
Any chance this has to do with your file_field
being
<%= images_form.file_field :image %>
instead of the following?
<%= images_form.file_field :picture %>
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