Rails 6 added I18n key style support for submit tag.
Before Rails 6
Suppose we have a form for Admin::User model which expects first name and last name to create
an admin user as shown below -
<%= form_for @admin_user do |f| %>
<div class="form-group">
<%= f.label :first_name %>
<%= f.text_field :first_name, class: "form-control" %>
</div>
<div class="form-group">
<%= f.label :last_name %>
<%= f.text_field :last_name, class: "form-control" %>
</div>
<div class="actions">
<%= f.submit class: "btn btn-lg btn-primary" %>
</div>
<% end %>
I18n translation key in en.yml is as below
en:
helpers:
submit:
admin_user:
create: Create Admin User
activerecord:
models:
admin/user: admin user
attributes:
admin/user:
first_name: First name
last_name: Last name
Here we can see that the generated key admin_user nested under submit key, is not in I18n format
but in <module_name>_<class_name> format.
After Rails 6
Due to the support of I18n format in Rails 6, key is now changed from
<module_name>_<class_name> to module_name/class_name.
en.yml
en:
helpers:
submit:
admin/user:
create: Create Admin User
activerecord:
models:
admin/user: admin user
attributes:
admin/user:
first_name: First name
last_name: Last name
This feature keeps all the I18n keys format consistent across all the components.
This change is backwards compatible, and so the old format can still be used in Rails 6.
