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Do I Edit the Migration Too to Show the Belongs To

+1 vote

Do I edit the corresponding migration also to show the belongs_to (and the has_many)? I have a many to many relationship where I am using the "has_many :through" association. When I place in the individual classes the 'has_many :through' and the 'belongs_to' associations, do I also edit the corresponding migrations to reflect those changes?
I would like those changes to be reflected in the database also, but I don't know whether there was a way to run one of the migration generator commands that would have included these associations.
Also, I have already run the migration so is there a way to create a new migration that would simply add these associations? I would prefer not to edit existing migrations.

posted Jul 11, 2013 by anonymous

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1 Answer

+1 vote
  1. No, there is no need to change the existing migrations. The relationship declarations (has_many and so on) have not direct effect on the database contents, they just tell Rails what to expect in the database.

  2. Whenever you make a change to the database use a new migration. You will just get yourself (and likely the database) very confused if you try to add to an existing migration.

  3. Work right through a good tutorial such as (which is free to use online) before starting you own experiments. That will show you the basics of Rails.

answer Jul 11, 2013 by anonymous
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