How do you pass self to class_eval in ruby?

Answer 1

The string parameters will be interpreted in the current context, so you're free to call self.name there, or name directly:

SomeClass.class_eval "has_many :#{name.tableize}, :through=>:join_models"

If instead of doing an eval on a string you were using a block, note that class_exec is a variation on class_eval that allows you to pass parameters naturally. So:

SomeClass.class_exec(name.tableize.to_sym) do |klass|
  has_many klass, :through=>:join_models
end

It is new to 1.8.7, so you'll need to require 'backports/1.8.7' if in 1.8.6.

Note: I'm assuming you need to eval at all, because in your particular example, you can call that method directly, no?

SomeClass.has_many name.tableize.to_sym, :through=>:join_models