Question

Using Rails 3.1.3 with Ruby 1.9.3p0.

I’ve discovered that by default, Rails does not use sentence case for form buttons. For example, instead of an “Update user” button, it generates an “Update User” button.

The button names come from the ActionView locale file. Is there a way to create a default that downcases the model name? This is not covered in the Ruby on Rails Guides i18n section on Interpolation so maybe it is not possible. The following doesn’t work:

en:
  helpers:
    submit:
      update: 'Update %{model}.downcase'

In general, I’d be glad to find a reference for the syntax of the locale YAML files. The i18n guide covers some of the syntax, but it would be helpful to find documentation on all the exclamation points, various date/time formats, etc. Or maybe I should be using a Ruby Hash instead of a YAML file for this purpose?

Answer 1

After further research, I’ve concluded that this kind of operation on interpolated values is not possible, at least using a YAML locale file.

YAML is documented here and doesn’t support string operations:
http://www.yaml.org/spec/1.2/spec.html

The main page on Ruby localization is here:
http://ruby-i18n.org/wiki

From there, we find the code for the default I18n gem and drill down to the interpolation code. It uses sprintf to do the interpolation:
https://github.com/svenfuchs/i18n/blob/master/lib/i18n/interpolate/ruby.rb

That code is “heavily based on Masao Mutoh’s gettext String interpolation extension”:
http://github.com/mutoh/gettext/blob/f6566738b981fe0952548c421042ad1e0cdfb31e/lib/gettext/core_ext/string.rb

That extension has an example of formatting numbers:

For strings.
"%{firstname}, %{familyname}" % {:firstname => "Masao", :familyname => "Mutoh"}

With field type to specify format such as d(decimal), f(float),...
"%<age>d, %<weight>.1f" % {:age => 10, :weight => 43.4}

The extension refers to the [Ruby] “Kernel::sprintf for details of the format string”:
http://www.ruby-doc.org/core-1.9.2/Kernel.html#method-i-sprintf

In that doc on sprintf, there are lots of ways to format numbers, but no operations for changing the case of strings.