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Show how to modify the cascade of a foreign key #536

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Jul 14, 2023
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Show how to modify the cascade of a foreign key #536

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6 changes: 6 additions & 0 deletions lib/ecto/migration.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -1208,6 +1208,12 @@ defmodule Ecto.Migration do
modify :title, :text, null: false, from: {:string, null: true}
end

# Modify the :on_delete option of an existing foreign key
alter table("comments") do
modify :post_id, references(:posts, on_delete: :delete_all),
from: references(:posts, on_delete: :nothing)
end

## Options

* `:null` - determines whether the column accepts null values. If this option is
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