Rails5.1からのform_withでnested_formを扱う方法 - Qiita

# Passing model: @post will 1) set scope: :post, 2) set url: url_for(@post) form_with(model: @post) do |form| form.text_field :title # Will reference @post.title as normal form.text_area :description, "Overwrite @post.description if present, if not, it will still work" form.submit end form_with(scope: :post, url: posts_path) do |form| form.text_field :title # post[title] form.text_area :descriptio