Displaying string with format in ActiveRecord

Question

I have a credit card number field on a table. For <%= f.text_field :credit_number %>, I want to show it with some format like 'xxxx xxxx xxxx xxxx' instead of 'xxxxxxxxxxxxxxxx'. But I don't want to save the space with the number in the DB.

For now I don't care about inputting but only displaying.

What's the best way to accomplish it?

Thanks.

Sam

Roman Kiselenko · Accepted Answer · 2014-07-22 16:43:03Z

1

text_field not good for credit card number use <input type="number"> instead.Try create helper, for render in view like this:

=> "xxxxxxxxxxxxxxxx".chars.each_slice(4).map(&:join)*' '
=> "xxxx xxxx xxxx xxxx"

in view use placeholder:

<%= f.text_field :credit_number, placeholder: "xxxx xxxx xxxx xxxx" %>

From comment:

add before_create block to model in models/user.rb:

before_create do
  credit_number.split(' ').join if credit_number
end

Now before create (write to db) credit_number string join.

edited Jul 22, 2014 at 16:43

answered Jul 22, 2014 at 6:54

Roman Kiselenko

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2 Comments

Sam Kong Over a year ago

Thank you for the answer. However, you misunderstood my question. I know how to change the string. But I want to save the data without format while showing with format.

Roman Kiselenko Over a year ago

@SamKong add before_create block to you model. Look update answer

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