I have created few models which are shown below.
Base models are TransactionType and TransactionItem
ExpenseType and IncomeType derives from TransactionType.
Expense and Income derives from TransactionItem.
class TransactionType < ActiveRecord::Base
scope :expense_types, -> { where(tran_type: 'ExpenseType') }
scope :income_types, -> { where(tran_type: 'IncomeType') }
self.inheritance_column = "tran_type"
validates :name, uniqueness: true
end
class ExpenseType < TransactionType
end
class IncomeType < TransactionType
end
class TransactionItem < ActiveRecord::Base
validates :note, length: { in: 2..255 }
end
class Expense < TransactionItem
belongs_to :expense_type
validates :expense_type, presence: true
end
class Income < TransactionItem
belongs_to :income_type
validates :income_type, presence: true
end
I can create objects for ExpenseType.
But, it throws error when Expense or Income object created.
<code>
ExpenseType.new(:name => "Grocceries").save!
ExpenseType.new(:name => "Travel").save!
IncomeType.new(:name => "Salary").save!
IncomeType.new(:name => "Bonus").save!
Expense.new(:note => "a soda", :expense_type => ExpenseType.first)
2.1.2 :006 > Expense.new(:note => "a soda", :expense_type =>
ExpenseType.first)
ExpenseType Load (0.1ms) SELECT "transaction_types".* FROM
"transaction_types" WHERE "transaction_types"."tran_type" IN
('ExpenseType') ORDER BY "transaction_types"."id" ASC LIMIT 1
ActiveModel::MissingAttributeError: can't write unknown attribute
`expense_type_id'
from
It would be great if someone shares your idea for solving this.
Thanks,
Masc
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