Active Admin 剥离表单输入

Question

Is it possible to strip forms' input fields in Rails Active Admin ?

eg:

  form do |f|
    f.inputs do
      f.input :attr, as: :string
    end
  end

I tried string_options to copy datepicker_options mechanism, but no luck.

  form do |f|
    f.inputs do
      f.input :attr, as: :string, string_options: { strip: true }
    end
  end

I did not found anything in the doc.

note : strip means removing empty spaces from the beginning and end of a string.

"  clean input  ".strip # "clean input"

Answer 1

One not recommended way is:

f.input :attr, as: :string, html_options: { value: f.object.attr.try(:strip) }

But then you might interfere with formtastic internals, or with localization or someting else. This imho is the better way: use a before validation hook in your ActiveRecord model:

class YourModel < ApplicationRecord
  before_validation :strip_whitespace
   
  def strip_whitespace
    self.attr = self.attr.try(:strip)
  end
end