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Editorial Team
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Asked: 2026-05-26T07:15:59+00:00

Project has_many :tasks Task has_many :invoices, :through => :line_items has_many :line_items LineItems belongs_to :invoice

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Project
has_many :tasks

Task
has_many :invoices, :through => :line_items
has_many :line_items

LineItems
belongs_to :invoice
belongs_to :task

Invoice
has_many :tasks, :through=> :line_item
has_many :line_items

I’m trying to get an association from Project has_many :invoices, :through => :tasks

When I tried that, I get:

Invalid source reflection macro :has_many :through for has_many :invoices, :through => :tasks. Use :source to specify the source reflection.

I’m a little at a loss to if this is possible, and if so, how to use :source correctly

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1 Answer

  1. Editorial Team

    Ryan is right, this is supported from Rails 3.1. Extracted from the release notes:

    Associations with a :through option can now use any association as the through or source association, including other associations which have a :through option and has_and_belongs_to_many associations.

    Src: http://guides.rubyonrails.org/3_1_release_notes.html

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