Unique ID for DOM in Rails

Rails has many great view helpers, one of which is dom_id:
dom_id(Post.find(12))       # => "post_23"
dom_id(Post.new)            # => "new_post"

You can also provide a prefix:
dom_id(Post.find(23), :edit) # => "edit_post_23"
dom_id(Post.new, :custom)    # => "custom_post"
Const

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