getting id in an array

rubyonrails-talk
1

Hi, I'm begining with rails I need to get an array of all id of a table.

name of my model is ContentGroup so I tried ContentGroup.find(:all, :order=>"ASC") but I have an array of objet and I only need the ids.

How can I do to get only id fields ?

2

Hi, I'm begining with rails I need to get an array of all id of a table.

name of my model is ContentGroup so I tried ContentGroup.find(:all, :order=>"ASC") but I have an array of objet and I only need the ids.

How can I do to get only id fields ?

ContentGroup.find(:all, :order=>"ASC").collect {|cg| cg.id}

3

David Nguyen wrote:

Hi, I'm begining with rails I need to get an array of all id of a table.

name of my model is ContentGroup so I tried ContentGroup.find(:all, :order=>"ASC") but I have an array of objet and I only need the ids.

How can I do to get only id fields ?

Hi Try this @user=ContentGroup.find(:all,:select=>"id",:order=>"id asc")

4

David Nguyen wrote:

Hi, I'm begining with rails I need to get an array of all id of a table.

name of my model is ContentGroup so I tried ContentGroup.find(:all, :order=>"ASC") but I have an array of objet and I only need the ids.

How can I do to get only id fields ?

ContentGroup.find(:all, :select => 'id').map(&:id)