Finally, we need to account for the new association to OtherModel that was added. We need calls to OldModel.old_field_3 to act exactly the same as NewModel.other_model.other_field_1. For this, we use a
combination of alias and delegate:
As shown in the diagram above, we converted a single database table into two tables, and spread the columns between the two. The concept was simple enough: Iterate over all the rows in the old table and create entries in the new tables based on the existing data, ensuring the new association exists. We also wanted to make sure the IDs in the new tables matched the old IDs, because we have some external tools and reports that rely on that ID. Here’s a naive first attempt:
OldModel.find_in_batches do |batch|
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