Query question

rubyonrails-talk
1

Hi there,

Why does the following query...

  ser = 'ser'   @user = ('U'+ser).find(:first)

...not equal this one:

  @user = User.find(:first)

?

What needs to be done so it will work?

Thanks for your help! Tom

2

Hi there,

Why does the following query...

ser = 'ser' @user = ('U'+ser).find(:first)

...not equal this one:

@user = User.find(:first)

?

What needs to be done so it will work?

>> ser = 'ser' => "ser" >> user = 'U' + ser => "User" >> user.class => String >> User.class => Class >> user.constantize.class => Class >> user.constantize.find(:first)    User Load (1.2ms) SELECT * FROM "users" LIMIT 1 => #<User id: 1,.........

3

Great - thanks!

4

1 question back, though:

What if need to end up having...

  @user = User.find(:first)

...based on a case like this:

  @u = '@u'   ser = 'ser'

Is there something as "objectize"? :slight_smile:

How would the following need to be corrected?

  (@u+ser).objectize = User.find(:first)

Thanks for your help! Tom

5

instance_variable_set(@u + ser, User.find(:first))

6

Thanks!