Override AR::Relation methods in NullRelation.

So a NullRelation (Relation#none) is chainable with database methods.

1 files changed, 53 insertions, 0 deletions

diff --git a/activerecord/lib/active_record/null_relation.rb b/activerecord/lib/active_record/null_relation.rb
index 60c37ac2b7..c2d3eeb8ce 100644
--- a/activerecord/lib/active_record/null_relation.rb
+++ b/activerecord/lib/active_record/null_relation.rb
@@ -6,5 +6,58 @@ module ActiveRecord
     def exec_queries
       @records = []
     end
+
+    def pluck(column_name)
+      []
+    end
+
+    def delete_all(conditions = nil)
+      0
+    end
+
+    def update_all(updates, conditions = nil, options = {})
+      0
+    end
+
+    def delete(id_or_array)
+      0
+    end
+
+    def size
+      0
+    end
+
+    def empty?
+      true
+    end
+
+    def any?
+      false
+    end
+
+    def many?
+      false
+    end
+
+    def to_sql
+      @to_sql ||= ""
+    end
+
+    def where_values_hash
+      {}
+    end
+
+    def count
+      0
+    end
+
+    def calculate(operation, column_name, options = {})
+      nil
+    end
+
+    def exists?(id = false)
+      false
+    end
+
   end
 end
\ No newline at end of file