Rails - Jul 2013 - Do I Edit the Migration Too to Show the Belongs To

Hi Everyone,

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.

Thank you in advance for the advice. I''m very new to Rails and am just 
learning it with a toy application I''m building.

p

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On 11 July 2013 06:55, Peter
<peter-I8Khkwz7QpbQT0dZR+AlfA@public.gmane.org>
wrote:
> Hi Everyone,
>
> 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?
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.
>
> 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.
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.
>
> Thank you in advance for the advice. I''m very new to Rails and am
just
> learning it with a toy application I''m building.
Work right through a good tutorial such as railstutorial.org (which is
free to use online) before starting you own experiments.  That will
show you the basics of Rails.

Colin

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