When upgrading to Rail4, I changed conditions to where in the model but I'm now getting a syntax error ( syntax error, unexpected '}', expecting keyword_end)
has_many :businesses, through: :business_admins, { where business_admins: { state: 'accepted'} }
Change it to this:
has_many :businesses,
-> { where(business_admins: { state: 'accepted'}) },
through: :business_admins
Also see the Rails documentation.