ruby - ROR + Error For nil:NilClass In Rake Task -

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in rake command calling xml retrieve data. if person_id valid, saved. getting error.

if !@case.person_id.nil?     @project.team_members << @person  end

error :: rake aborted! undefined method `team_members' nil:nilclass

please suggest thing !!!

@project nil variable , why cannot invoke team_members. check how define it. moreover, may want follow ruby way of doing things. 'if not' occasions better write :

unless @case.person_id.nil?   ...

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