Ruby on Rails

Rails 3.1.3

I have tables

User => has_many :contribution
Contribution => belongs_to :user

in user.rb, I would like to define a method to compute the total
contribution
(sum of field 'price:integer' )

def total_contribution
@contributions = Contribution.find_all_by_user(self)
total = 0
@contributions.each do |c|
if c.done
total += c.price
end
end
return total
end

"Contribution.find_all_by(self)" gives an error

undefined method `find_all_by' for

Is there any better way?

soichi

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