form_with problem

[GATAKAWAKACHICO]

@paul-at Thank you for providing an awesome gem.
I'd like to contribute to your repo. I found that it goes wrong when I use form_with method because of the line as below.
https://github.com/paul-at/quill-rails5/blob/master/lib/quill/rails5/view_helpers.rb#L42
The error log is here.

undefined method `[]' for nil:NilClass
lib/quill/rails5/view_helpers.rb:42:in `quill_field'

form_with method doesn't generate

form.options[:html][:id]

So, I needed to set an form id like this after that it successfully worked.

<% # before %>
<%= form_with(model: foo, local: true) do |form| %>

<% # after %>
<%= form_with(model: foo, local: true, html: {id: 'foo'} ) do |form| %>

How do I fix this problem and push PR?

FYI: DHH said that rails should unify form_tag and form_for into form_with.
rails/rails#25197

[paul-at]

Thanks for sharing this workaround!

I think form_with should have some way to access form id as well?

[GATAKAWAKACHICO]

@paul-at
I think form_with method doesn't generate form id automatically by default.
http://edgeapi.rubyonrails.org/classes/ActionView/Helpers/FormHelper.html#method-i-form_with
I quote from this doc.

# An existing model makes an update form and fills out field values:
<%= form_with model: Post.first do |form| %>
  <%= form.text_field :title %>
<% end %>
# =>
<form action="/posts/1" method="post" data-remote="true">
  <input type="hidden" name="_method" value="patch">
  <input type="text" name="post[title]" value="<the title of the post>">
</form>

# Though the fields don't have to correspond to model attributes:
<%= form_with model: Cat.new do |form| %>
  <%= form.text_field :cats_dont_have_gills %>
  <%= form.text_field :but_in_forms_they_can %>
<% end %>
# =>
<form action="/cats" method="post" data-remote="true">
  <input type="text" name="cat[cats_dont_have_gills]">
  <input type="text" name="cat[but_in_forms_they_can]">
</form>

Currently, I use rails 5.1.2 and because of above, posted an PR.
Could you try to create some form with using form_with method?