Question

I have a query in my ruby file :

@mastertest = connection.execute("select code_ver,date from mastertest")

And I print the result of the query as below:

@mastertest.each do |row|
  puts row[0] : row[1]
end

This will print all the code_ver and ‘date’ which looks like this

2.0 : 2012/12/10
3.1 : 2012/11/03
2.5 : 2012/07/08
1.8 : 2012/12/11
2.5 : 2012/03/01

Now I want to sort this array based on my code_ver, but the problem is ruby does not consider this as an array, it says it is some mysql2 type.

How do I proceed further? I want to either convert this thing to 2-d array or I would want to sort it based on the row[0].

Answer 1

You’re getting a MySQL result set object in @mastertest and a result set is not an array.

If you’re using mysql2, then you should have a Mysql2::Result and that’s Enumerable so it has a to_a method:

@mastertest.to_a.sort { ... }

If you’re using the mysql gem, then you should have a Mysql::Result and you’ll have to convert @mastertest to an Array by hand:

a = [ ]
@mastertest.each { |r| a.push(...) }
a.sort { ... }

Or you could simply let the database do the sorting:

@mastertest = connection.execute('select code_ver, date from mastertest order by code_ver')