jake

@jakeprem.com

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Ecto code showing a more conventional has many through approach: schema "posts" do belongs_to :photos_ledger, AttachmentLedger has_many :photos, through: [:photos_ledger, :attachments] end
An example Ecto migration showing that both fields still use foreign key references: create table(:attachments) do # ... add :attachment_ledger_id, references(:attachment_ledgers) end create table(:posts) do # ... add :photos_ledger_id, references(:attachment_ledgers) end
Elixir code describing an approach to has_many associations in Ecto using a ledger record: schema "posts" do belongs_to :photos_ledger, AttachmentLedger has_many :photos, Attachment, foreign_key: :attachment_ledger_id, references: :photos_ledger_id end iex> post = %Post{photos_ledger_id: 1} iex> Ecto.build_assoc(post, :photos, attrs) %Attachment{attachment_ledger_id: 1}