Fish belongs to Sushi, so that's where :sushi_id come from. There's also controller and model for Sushi, with :id field, and that field is used as identifier in Fish controller.
Sushi would have a fields like: :id, :type..., with has_many :fishes
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This is pretty old, but maybe for someone else:
Fish belongs to Sushi, so that's where :sushi_id come from. There's also controller and model for Sushi, with :id field, and that field is used as identifier in Fish controller.
Sushi would have a fields like: :id, :type..., with has_many :fishes