问题
I know how to override a Rails template in a gem, but how can I override gem generator template in a Rails application
e.g.: https://github.com/elabs/pundit/blob/master/lib/generators/pundit/policy/templates/policy.rb
or
https://github.com/drapergem/draper/blob/master/lib/generators/rails/templates/decorator.rb
so that rails g decorator Foo would generate my template, not the gem native one
thx
回答1:
From Rails guide on generators:
In Rails 3.0 and above, generators don't just look in the source root for templates, they also search for templates in other paths. And one of them is lib/templates.
So, if you mimic the directory hierarchy of the gem/tamplate you are trying to override, rails will pick your template instead of the ones in the gem source
Update:
Now, the question is how to correctly mimic that hierarchy so rails pick your template up?
Well it turned out there is some kind of a rule | pattern for that, for example if you want to override a template in this path: lib/generators/pundit/policy/templates/policy.rb
You should place your template in lib/templates/pundit/policy/policy.rb
To override lib/generators/rails/templates/decorator.rb
You should place your template in lib/templates/rails/decorator/decorator.rb
Update 2
It seems that the pattern is flowing: lib/templates/gem_name/generator_name/template_file_name.rb
In case of Draper gem, the gem is enforcing itself to act like native Rails generator:
/draper/lib/generators/rails/templates/decorator.rb
...so that's why we needed to use:
lib/templates/rails/generator_name/template_file_name.rb.
To override RSpec template generator of a Draper gem:
lib/templates/rspec/generator_name/template_file_name.rb
...and so on
回答2:
To customize templates for twitter-bootswatch-rails gem's views generator, copy the whole content of its template folder into
lib/templates/bootswatch/themed
And run rails g bootswatch:themed YourModels
回答3:
To copy the default Pundit generators to your Rails project, you can use this command:
mkdir -p lib/templates/pundit/policy && \
cp $(bundle show pundit)/lib/generators/pundit/policy/templates/* lib/templates/pundit/policy
来源：https://stackoverflow.com/questions/21732373/how-to-override-gem-generator-template-in-rails-app