From caaf40d5358ae8a2b31949c2af2d94be1be73976 Mon Sep 17 00:00:00 2001 From: David Heinemeier Hansson Date: Sat, 24 Sep 2005 19:50:57 +0000 Subject: Added AbstractAdapter#select_value and AbstractAdapter#select_values as convenience methods for selecting single values, instead of hashes, of the first column in a SELECT #2283 git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@2323 5ecf4fe2-1ee6-0310-87b1-e25e094e27de --- .../active_record/connection_adapters/abstract_adapter.rb | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'activerecord/lib/active_record/connection_adapters') diff --git a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb index a1a71afb5b..fed51fea18 100755 --- a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb +++ b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb @@ -275,6 +275,19 @@ module ActiveRecord # Returns a record hash with the column names as a keys and fields as values. def select_one(sql, name = nil) end + # Returns a single value from a record + def select_value(sql, name = nil) + result = select_one(sql, name) + result.nil? ? nil : result.values.first + end + + # Returns an array of the values of the first column in a select: + # select_values("SELECT id FROM companies LIMIT 3") => [1,2,3] + def select_values(sql, name = nil) + result = select_all(sql, name) + result.map{ |v| v.values.first } + end + # Returns an array of table names for the current database. # def tables(name = nil) end -- cgit v1.2.3