Ruby rails - select only few columns from the data base

Question

What is the way in rails to structure sql query to only select certain columns from the database, I have some large data fields which I want to avoid loading from continuous

Answer 1

@itemlist = Item.select('name, address').where(...#some condition)

Answer 2

Make use of :select construct. Try this:

@itemlist = Item.select('name, address', conditions: { .... } )

For previous version of Rails:

@itemlist = Item.find(:all,:select => 'name, address', :conditions => { .... } )

Answer 3

Using Arel (aka in Rails 3), use:

Item.where(...).select("name, address")

Also, it seems .select gets ignored if you tack on a scope that has an :include => ...

Answer 4

If want to select specific columns from the rails console, pluck( will work. Example:

2.4.1 :007 > User.connection
2.4.1 :006 > User.all.pluck(:email)
   (0.3ms)  SELECT `users`.`email` FROM `users`
 => ["test@test.com", "another_test@test.com"] 

Note that this will also work from within the Rails app.

Answer 5

Rails 3:

Item.select("name, address").where( .... )

Answer 6

Try this:

@itemlist = Item.find(:all, :select => "name, address", :conditions => { .... } )