Ruby on Rails - how to instantiate an empty model and populate the object

Question

I am trying to create an empty model, populate it and then add it to the database.

I am looking through Google for the syntax for instantiating a simple model that I can set fields in, but there does not seem to be much documentation for that.

Is that just not the intended useage pattern? If it is, how can I just create the empty model?

Thanks!

We need more info. What do you mean by 'empty model'? One where there's no class defined for it at all, or something else... ? — x1a4
– x1a4, Commented May 16, 2012 at 19:23
What are you looking for beyond Blah.create(:name => 'bob') — Frederick Cheung
– Frederick Cheung, Commented May 16, 2012 at 19:24
@Casper no it doesn't, but I will need to define the db structure as I do it. It is mongo. — Awesomeness
– Awesomeness, Commented May 16, 2012 at 19:29
@x1a4 I meant something equivalent to Java's Obj x = new Obj(); — Awesomeness
– Awesomeness, Commented May 16, 2012 at 19:30

DVG · Accepted Answer · 2012-05-16 19:46:23Z

2

An ActiveRecord model works based on what fields it's related table has in your db. If you have no db yet you have no fields. The usage pattern goes like this:

$ rails g model client name:string
#stuff happens
$ rake db:migrate

You now have a model associated with a clients table that has a string attribute called name.

Now in your controller you can use this by

@client = Client.new
@client.name = "foo"
@client.save

Which will create the model object, set the name, and persist it to the db

answered May 16, 2012 at 19:46

DVG

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Marlin Pierce · Accepted Answer · 2012-05-16 19:47:39Z

1

You should read up on the Rails Guides. Your current issue is covered at this link, but you really need to read up on getting started.

answered May 16, 2012 at 19:47

Marlin Pierce

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