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Supporting form_with in Rails 8.0 #32

@jiko797torayo

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@jiko797torayo

Thank you for the wonderful gem✨

When I tried to upgrade a Rails application that using this gem to Rails 8.0, the following error occurred.

ActionView::Template::Error (Passed nil to the :model argument, expect an object or false)
Caused by: ArgumentError (Passed nil to the :model argument, expect an object or false)

Information for: ActionView::Template::Error (Passed nil to the :model argument, expect an object or false):
    1: <%= form_with url: '/search', id: 'form_with' do |f| %>
    2: <%= f.search_field :query, id: 'query' %>
    3: <% end %>

The cause is that the default value of the model: argument of form_with was changed from nil to false in Rails 7.2, and passing nil to the model: argument causes an error in Rails 8.0.

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