There's so many ways to render an ActionText attachment, we can change the app/views/active_storage/blobs/_blob.html.erb
as we saw in a previous post. This will apply to all ActiveStorage blobs. However, you may want more fine grained control for things like CustomAttachments. You'll also find some of the ways to change a models ActionText rendering method:
to_trix_content_attachment_partial_path
to_attachable_partial_path
to_partial_path
These methods are particularly useful when creating Custom Attachments. We won't cover those in this post, but that's where the above methods will come into play.
Let's talk about what each does:
to_trix_content_attachment_partial_path
Under the hood Rails calls value.to_trix_html
when you render within your Trix editor using the rich_text_area
form helper.
<%= form_with model: @post do |f| %>
<!-- calls @post.body.to_trix_html -->
<% f.rich_text_area :body %>
<% end %>
So to_trix_content_attachment_partial_path
is what users will see in their editor.
to_attachable_partial_path
When the user hits save, then the editor will show the final output by calling:
to_attachable_partial_path
This allows you to create 2 experiences, one for the editor, and one for the final rendering.
to_partial_path
to_partial_path
is a standard rendering path for models. This is used as a shortcut for to_attachable_partial_path
and to_trix_content_attachment_partial_path
.
For more on to_partial_path
it's worth checking out this Thoughtbot article on rendering.
https://thoughtbot.com/blog/rendering-collections-in-rails
Here's what it may look like all together in an actual attachable model:
With an ActiveRecord Model
class User < ApplicationRecord
include ActionText::Attachable
# app/views/users/_mention.html.erb
# rendered in final rendering
def to_attachment_partial_path
"users/mention"
end
# app/views/users/_thumbnail.html.erb
# rendered in Trix editor
def to_trix_content_attachment_partial_path
"users/thumbnail"
end
# app/views/users/_user.html.erb
# rendered when calling <%= render User.first %>
def to_partial_path
"users/user"
end
end
With a non-ActiveRecord model
class Youtube
include ActiveModel::Model
include ActiveModel::Attributes
include GlobalID::Identification
include ActionText::Attachable
# to be eligible to create an "sgid" we need to implement an
# "id" attribute.
attribute :id
# app/views/youtubes/_embed.html.erb
# rendered in final rendering
def to_attachment_partial_path
"youtubes/embed"
end
# app/views/youtubes/_thumbnail.html.erb
# rendered in Trix editor
def to_trix_content_attachment_partial_path
"youtubes/thumbnail"
end
# app/views/youtubes/_youtube.html.erb
# rendered when calling <%= render Youtube.first %>
def to_partial_path
"youtubes/youtube"
end
end
Conclusion
-
to_trix_content_attachment_partial_path
is for rendering in the editor -
to_attachable_partial_path
is for rendering in the final output -
to_partial_path
is for standard object rendering
For more on Attachments, particularly custom attachments checkout the following resources:
- https://www.youtube.com/watch?v=2iGBuLQ3S0c
- https://afomera.dev/posts/2022-10-11-combined-mentions-part-one
- https://afomera.dev/posts/2022-10-12-combined-mentions-part-two
- https://gorails.com/episodes/at-mentions-with-actiontext
- https://dev.to/yarotheslav/how-to-embed-youtube-videos-with-actiontext-tldr-5bbh
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