Hi,
I am writing a small rails application that uses Ruby(1.8.5) with ActiveRecord (1.15.3) .
I realized that if i use the find method with the optional parameter :select with only the required columns to look for records in a table with 50,000 records as opposed to a find method without the :select option, the query is a lot faster. It took me 31 secs in the former case as opposed to 12 in the latter. I am using MySQL and my application is running on windows. (And yes, the table that I am querying is indexed).
Now my problem is that if i use :select the way it is mentioned in the rails documentation
Item.find( :all, :select => [:column1, :column2, :column3] ) or Item.find( :all, :select => ['column1', 'column2', ':column3'] )
It throws an error because it executes a query like:
select column1column2 column3 from items;
when there is no column like column1column2column3 in the table items.
However, If i modify my request and put a comma after each column name except on the last one
Item.find( :all, :select => ['column1,' , 'column2,' , 'column3'] )
it works because this time it executes the query as noted below:
select column1,column2,column3 from items;
So I guess unless I am using some incompatible version, there could be a bug in ActiveRecord. Or am I missing something?
Thanks