Insert new record in Oracle table with RoR

Hello all, it's part of my code on RoR ":

Case #1
Hello all, there is part of my code :
      folder = Folder1.new()
      folder.ID = @id
      folder.CLIENT_NAME = @un
      folder.TREE_NAME = @tn
      folder.save()

when i test it on mySQL all work right, but when i try it with Oracle
i
got this error #NoMethodError (undefined method `ID=' for
#<FolderTree:0x4bae7cc>).

Case #2
I try again with other RoR api method
Folder1.create(:ID => @id, :CLIENT_NAME => @un, :TREE_NAME => @tn)

and again got error : #NoMethodError (undefined method `CLIENT_NAME='
for #<FolderTree:0x4baf6a4>)

Notes:
1. Field id not auto-increment (filled manually)
2. Folder1 it's model of folder table

It's exist table structure of folder1 model :
{
ID INTERGER
CLIENT_NAME VARCHAR2(35 BYTE) NOT NULL,
TREE_NAME VARCHAR2(35 BYTE) NOT NULL
}

Does anybody know why is an error ? Or another path to insert new
record.

SaD wrote:

      folder = Folder1.new()
      folder.ID = @id
got this error #NoMethodError (undefined method `ID=' for
#<FolderTree:0x4bae7cc>).

Can you post the full class definition you have for Folder1? And
FolderTree?

you use :ID instead of :id
MySQL is not case sensitive (at least with it's column names)
maybe oracle is?

same goes for :CLIENT_NAME etc