budget/app/models/member.rb

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class Member < ApplicationRecord
has_many :incomes, dependent: :destroy
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def income
incomes.sum(&:amount)
end
def included_income
incomes.where(included: true).sum(&:amount)
end
def others_included_income
Income.where(included: true).sum(&:amount) - included_income
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end
def burden_percent
((Income.total - others_included_income) / Income.total).round(2)
rescue
0
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end
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def burden_amount(total_amount: Expense.monthly_total)
burden_percent * total_amount
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end
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end