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Editorial Team
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Asked: 2026-05-21T04:57:44+00:00

So I want to dynamically have new_course_discussion_path(@discussable) or new_group_discussion_path(@discussable) depending on the @discussable class

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So I want to dynamically have new_course_discussion_path(@discussable) or new_group_discussion_path(@discussable) depending on the @discussable class type. How do I pass the message (@discussable) in to this method? I tried:

"new_#{@discussable.class.to_s.downcase}_discussion_path".constantize(@discussable)

but this says “wrong number of arguments (1 for 0)”. I’m new to rails. Please help! Thanks.

Update:
Right now, the whole line is 

= link_to '>New Discussion', "new_#{@discussable.class.to_s.downcase}_discussion_path".constantize(@discussable)
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1 Answer

  1. Editorial Team
    send "new_#{@discussable.class.to_s.downcase}_discussion_path", @discussable

    The path helpers are methods not classes. They’re accessible from controllers, views and helper methods and if you don’t qualify the send call, it will invoke the method on self.

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