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-rw-r--r--lib/arel/nodes/equality.rb5
-rw-r--r--lib/arel/table.rb2
-rw-r--r--lib/arel/visitors/to_sql.rb38
3 files changed, 45 insertions, 0 deletions
diff --git a/lib/arel/nodes/equality.rb b/lib/arel/nodes/equality.rb
index 11383b1d89..d778380054 100644
--- a/lib/arel/nodes/equality.rb
+++ b/lib/arel/nodes/equality.rb
@@ -7,6 +7,11 @@ module Arel
@left = left
@right = right
end
+
+ def to_sql
+ viz = Visitors::ToSql.new left.relation.engine
+ viz.accept self
+ end
end
end
end
diff --git a/lib/arel/table.rb b/lib/arel/table.rb
index 78b3ea9933..0ab39f134d 100644
--- a/lib/arel/table.rb
+++ b/lib/arel/table.rb
@@ -3,6 +3,8 @@ module Arel
@engine = nil
class << self; attr_accessor :engine; end
+ attr_reader :name, :engine
+
def initialize name, engine = Table.engine
@name = name
@engine = engine
diff --git a/lib/arel/visitors/to_sql.rb b/lib/arel/visitors/to_sql.rb
new file mode 100644
index 0000000000..ba92ca7ef1
--- /dev/null
+++ b/lib/arel/visitors/to_sql.rb
@@ -0,0 +1,38 @@
+module Arel
+ module Visitors
+ class ToSql
+ def initialize engine
+ @engine = engine
+ @connection = nil
+ end
+
+ def accept object
+ @connection = @engine.connection
+ visit object
+ end
+
+ private
+ def visit_Arel_Nodes_Equality o
+ "#{visit o.left} = #{visit o.right}"
+ end
+
+ def visit_Arel_Attributes_Integer o
+ "#{quote_table_name o.relation.name}.#{quote_column_name o.name}"
+ end
+
+ def visit_Fixnum o; o end
+
+ def visit object
+ send :"visit_#{object.class.name.gsub('::', '_')}", object
+ end
+
+ def quote_table_name name
+ @connection.quote_table_name name
+ end
+
+ def quote_column_name name
+ @connection.quote_column_name name
+ end
+ end
+ end
+end