How can I format the value shown in a Rails edit field?

The best I have come up with so far is something like this:

<%= f.text_field :my_attribute, :value => number_with_precision(f.object.my_attribute) %>

Or my_attribute could return the formatted value, like this:

def my_attribute  ApplicationController.helpers.number_with_precision(read_attribute(:my_attribute))end

But you still have to use :value

<%= f.text_field :my_attribute, :value => f.object.my_attribute %>

This seems like a lot of work.

I prefer your first answer, with the formatting being done in the view. However, if you want to perform the formatting in the model, you can use wrapper methods for the getter and setter, and avoid having to use the :value option entirely.

You'd end up with something like this.

def my_attribute_string  foo_formatter(myattribute)enddef my_attribute_string=(s)  # Parse "s" or do whatever you need to with it, then set your real attribute.end<%= f.text_field :my_attribute_string %>

Railscasts covered this with a Time object in a text_field in episode #32. The really clever part of this is how they handle validation errors. It's worth watching the episode for that alone.

This is an old question, but in case anyone comes across this you could use the number_to_X helpers. They have all of the attributes you could ever want for displaying your edit value:

<%= f.text_field :my_number, :value => number_to_human(f.object.my_number, :separator => '', :unit => '', :delimiter => '', :precision => 0) %>

There are more attributes available too: http://api.rubyonrails.org/classes/ActionView/Helpers/NumberHelper.html