Starting my first application with Rails

Hi:
I’m starting a simple application to learn Rails and Ruby of course. I
come
from PHP and frameworks like Symfony, CakePHP and CodeIgniter and some
of
them have a task to create DB models from existent database which is my
case. I have a PostgreSQL database which want to use in my app. My
question
is: exists any rake or rails command to generate models if they exists
in
Rails?

Ing. Reynier Perez M.
eMail: [email protected], [email protected]
Skype: reynierpm
Mobile: +58 424.180.5609
Site: http://reynierpm.site90.com

On Fri, Mar 2, 2012 at 10:33 AM, [email protected]
[email protected]wrote:

Skype: reynierpm
Mobile: +58 424.180.5609
Site: http://reynierpm.site90.com

A model can be generated using

rails generate model MODELNAME field1:type field2:type …

Javier Q.

Thanks Javier and what about ID (PK) fields? Need to be specified too or
Rails is smart enough to get them from tables?

Ing. Reynier Perez M.
eMail: [email protected], [email protected]
Skype: reynierpm
Mobile: +58 424.180.5609
Site: http://reynierpm.site90.com

When you generate for example

rails generate model Projects name:string

it will generate a table

id name created_at updated_at

and as you see I named it PROJECTS but rails is smart enough to change
it
into PROJECT =)

You should give this tutorial a try

http://ruby.railstutorial.org/

and also

http://railsforzombies.org/

Hope that helps

Javier Q.

Also can my tables be named in singular or all needs to be plural? I’m
reading conventions right now but have this doubt. For example if I have
a
table called record the correct name for the model could be Record <<
ActiveRecord::Base?
Ing. Reynier Perez M.
eMail: [email protected], [email protected]
Skype: reynierpm
Mobile: +58 424.180.5609
Site: http://reynierpm.site90.com

On 2 March 2012 15:41, [email protected] [email protected] wrote:

Also can my tables be named in singular or all needs to be plural? I’m
reading conventions right now but have this doubt. For example if I have a
table called record the correct name for the model could be Record <<
ActiveRecord::Base?

You can do that sort of thing (see set_table_name), however I strongly
suggest that first you work right through a good tutorial such as
railstutorial.org (which is free to use online) in order to get a
grasp of the basics. Rails relies for much of its magic on sticking
to the conventions. It /is/ possible to circumvent them but life is
much easier if you can avoid it. If you google for
rails legacy database
you will find a lot of useful stuff, but again if you can possibly
change the db schema to match rails conventions then do that.

Colin

On Fri, Mar 2, 2012 at 11:06 AM, Javier Q. [email protected]

of them have a task to create DB models from existent database which is my

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gplus.to/clanlaw

On Mar 2, 2012, at 10:41 AM, [email protected] wrote:

Also can my tables be named in singular or all needs to be plural? I’m reading
conventions right now but have this doubt. For example if I have a table called
record the correct name for the model could be Record << ActiveRecord::Base?

You can certainly override the conventions, but it’s going to be messy.
Particularly if you do something like tell Rails that the plural of
record is record. The conventions are there to remove needless
configuration.

Walter

@Javier: Thanks for your clarifications it’s a bit clear to me now
@Colin: I can do that without problem because I’m starting the
application
so maybe I could create models from scratch using Rails but what about
fixtures? I’ve a table country and will be nice if I can populate the
table
with 238 records :slight_smile:
@Walter: Understood but what about relations? How to deal with this from
rails command line? I have relations BelongsTo (record belongs to
country)
and hasMany (record hasMany attachment and some others)

Thanks to every
Ing. Reynier Perez M.
eMail: [email protected], [email protected]
Skype: reynierpm
Mobile: +58 424.180.5609
Site: http://reynierpm.site90.com

On Mar 2, 2012, at 10:39 AM, [email protected] wrote:

Thanks Javier and what about ID (PK) fields? Need to be specified too or Rails
is smart enough to get them from tables?

To be clear, the instructions that Javier gave you are to create a new
table and model to match, not to introspect an existing database table
and infer a model from it. This instruction is precisely how you create
a new model when starting a green-field Rails application.

To answer your follow up question, yes, Rails will add id, created_at
and updated_at columns (int-11, datetime, datetime) automagically. You
can certainly follow these steps (and be sure to issue the
–skip-migrations flag at the end so you don’t end up with a redundant
migration file) but I don’t think this is actually the answer you were
looking for. I don’t have one for you either, sorry, but I didn’t want
you to go down this path and get confused when it didn’t do what you
asked for.

Walter

On 2 March 2012 20:18, [email protected] [email protected] wrote:

@Javier: Thanks for your clarifications it’s a bit clear to me now
@Colin: I can do thatwithout problem because I’m starting the application
so maybe I could create models from scratch using Rails but what about
fixtures? I’ve a table country and will be nice if I can populate the table
with 238 records :slight_smile:

As I suggested previously, work through railstutorial.org and it will
introduce you to a variety of techniques including testing options.
Fixtures are not considered the best way of testing by most developers
now.

@Walter: Understood but what about relations? How to deal with this from
rails command line? I have relations BelongsTo (record belongs to country)
and hasMany (record hasMany attachment and some others)

The same goes here, work through the tutorial and you will be able to
answer basic questions yourself.

Colin

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