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Improve ordering of multiple columns on postgresql

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* Only on postgresql, order("first asc, second asc") was invalid
* Closes #1720
This commit is contained in:
Lucia Escanellas 2011-06-23 22:32:22 -03:00
parent 8a1319dec0
commit 9734a416fa
2 changed files with 8 additions and 1 deletions
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2
activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
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@ -940,7 +940,7 @@ module ActiveRecord
# Construct a clean list of column names from the ORDER BY clause, removing
# any ASC/DESC modifiers
order_columns = orders.collect { |s| s =~ /^(.+)\s+(ASC|DESC)\s*$/i ? $1 : s }
order_columns = orders.collect { |s| s.gsub(/\s+(ASC|DESC)\s*/i, '') }
order_columns.delete_if { |c| c.blank? }
order_columns = order_columns.zip((0...order_columns.size).to_a).map { |s,i| "#{s} AS alias_#{i}" }

7
activerecord/test/cases/relations_test.rb
View file

@ -176,6 +176,13 @@ class RelationTest < ActiveRecord::TestCase
assert_equal entrants(:first).name, entrants.first.name
end
def test_finding_with_cross_table_order_and_limit
tags = Tag.includes(:taggings) \
.order("tags.name asc, taggings.taggable_id asc, REPLACE('abc', taggings.taggable_type, taggings.taggable_type)") \
.limit(1).to_a
assert_equal 1, tags.length
end
def test_finding_with_complex_order_and_limit
tags = Tag.includes(:taggings).order("REPLACE('abc', taggings.taggable_type, taggings.taggable_type)").limit(1).to_a
assert_equal 1, tags.length