[Rails] Object doesn't support #inspect in rails 3.2.1

[Manish N.]

I migrate my application from rails 2.3.11 to rails 3.2.1

My models

class Campaign < ActiveRecord::Base
    has_many :campaign_reports
end

class CampaignReport < ActiveRecord::Base
     belongs_to :campaign
end

In console
c = Campaign.first

I got the output but when I do

c.campaign_reports

I got

(Object doesn't support #inspect)
=>

I m using
rails 3.2.1
ruby ruby 1.9.2p290
gem 1.8.15
rvm 1.10.2

Please help me :(

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