How to Generate Scaffold for Existing Table with Rails 3?

I’m new to Rails and have been googling for days on this subject.
Seems there used to be some built-in support for creating scaffolds
for existing tables in earlier Rails versions, and several plugins/
addons that did similar things, but as far as I can tell none of them
work with Rails 3.

Am I correct in assuming that to bolt a Rails 3 GUI onto an existing
database you have to manually define the fields for each table in the
“generate” command? If so, what happened to DRY and when is this
support expected for Rails 3?

Thanks for any help/ideas.

On Fri, Apr 15, 2011 at 4:12 PM, Lee [email protected] wrote:

Am I correct in assuming that to bolt a Rails 3 GUI onto an existing
database you have to manually define the fields for each table in the
“generate” command?

You don’t have to manually define them in the generate command. You can
add
them by hand later.

If so, what happened to DRY and when is this
support expected for Rails 3?

DRY is a concept. It means Don’t Repeat Yourself. The concept is applied
to
how you program your application. An example of violating DRY would be
having the same method in three different places in your app. Having to
define fields for a legacy database that you are now bolting a Rails app
to
is not a violation of this concept. However, this is all academic to
your
real issue. How do I connect my Rails 3 app to a legacy database?

I think what you are looking for is something like DataMapper. It works
with
Rails 3 (when using the gem dm-rails) and is actively being
developed/supported. You can learn more here:

http://datamapper.org/

dm_rails information can be found on the datamapper.org site and at the
source code location.

https://github.com/datamapper/dm-rails

They have tutorials on how to connect to legacy databases and lots of
information on working with some of the issues that come do that.

B.

On Fri, Apr 15, 2011 at 4:12 PM, Lee [email protected] wrote:

I’m new to Rails and have been googling for days on this subject.
Seems there used to be some built-in support for creating scaffolds
for existing tables in earlier Rails versions, and several plugins/
addons that did similar things, but as far as I can tell none of them
work with Rails 3.

You should be able to run ‘rails generate scaffold People
last_name:string
first_name:string…’ on rails 3. Though if you are working with legacy
data
you will just need to code by hand. I would say if you are really new,
what
I would do is create a test scaffold, that way you will get the
generated
files and you can copy the structures in building out your own views and
controllers.

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