Fix sorting by name on explore projects page

app/models/concerns/sortable.rb

@@ -12,8 +12,8 @@ module Sortable
     scope :order_created_asc, -> { reorder(created_at: :asc) }
     scope :order_updated_desc, -> { reorder(updated_at: :desc) }
     scope :order_updated_asc, -> { reorder(updated_at: :asc) }
-    scope :order_name_asc, -> { reorder("lower(name) asc") }
-    scope :order_name_desc, -> { reorder("lower(name) desc") }
+    scope :order_name_asc, -> { reorder(Arel::Nodes::Ascending.new(arel_table[:name].lower)) }
+    scope :order_name_desc, -> { reorder(Arel::Nodes::Descending.new(arel_table[:name].lower)) }
   end
 
   module ClassMethods

spec/models/concerns/sortable_spec.rb

@@ -40,15 +40,25 @@ describe Sortable do
 
     describe 'ordering by name' do
       it 'ascending' do
-        expect(relation).to receive(:reorder).with("lower(name) asc")
+        expect(relation).to receive(:reorder).once.and_call_original
 
-        relation.order_by('name_asc')
+        table = Regexp.escape(ActiveRecord::Base.connection.quote_table_name(:namespaces))
+        column = Regexp.escape(ActiveRecord::Base.connection.quote_column_name(:name))
+
+        sql = relation.order_by('name_asc').to_sql
+
+        expect(sql).to match /.+ORDER BY LOWER\(#{table}.#{column}\) ASC\z/
       end
 
       it 'descending' do
-        expect(relation).to receive(:reorder).with("lower(name) desc")
+        expect(relation).to receive(:reorder).once.and_call_original
+
+        table = Regexp.escape(ActiveRecord::Base.connection.quote_table_name(:namespaces))
+        column = Regexp.escape(ActiveRecord::Base.connection.quote_column_name(:name))
+
+        sql = relation.order_by('name_desc').to_sql
 
-        relation.order_by('name_desc')
+        expect(sql).to match /.+ORDER BY LOWER\(#{table}.#{column}\) DESC\z/
       end
     end