Fix schema dump for postgres

lib/enum_table/record.rb

@@ -63,7 +63,7 @@ def enum_map(name, options)
           map = {}
           table_name = table || "#{self.table_name.singularize}_#{name.to_s.pluralize}"
           return {} if EnumTable.missing_tables_allowed? && !connection.tables.include?(table_name)
-          connection.execute("SELECT id, value FROM #{connection.quote_table_name table_name}").each do |row|
+          connection.select_rows("SELECT id, value FROM #{connection.quote_table_name table_name}").each do |row|
             map[row[1]] = row[0]
           end
           map

lib/enum_table/schema_dumper.rb

@@ -13,7 +13,7 @@ def tables_with_enum_table(stream)
       table_names.each do |table_name|
         stream.puts "  create_enum_table #{table_name.inspect}, force: true do |t|"
         enum_table_column(stream, table_name, 'value', SchemaStatements::DEFAULT_VALUE_ATTRIBUTES)
-        @connection.execute("SELECT id, value FROM #{@connection.quote_table_name table_name} ORDER BY id").each do |row|
+        @connection.select_rows("SELECT id, value FROM #{@connection.quote_table_name table_name} ORDER BY id").each do |row|
           stream.puts "    t.add #{row[1].to_s.inspect}, #{row[0]}"
         end
         stream.puts "  end"

lib/enum_table/schema_statements.rb

@@ -19,8 +19,7 @@ def drop_enum_table(table_name)
 
     def enum_tables
       return [] if !table_exists?('enum_tables')
-      @enum_tables ||= execute("SELECT table_name FROM enum_tables").
-        map { |row| row[0] }.sort
+      @enum_tables ||= select_values("SELECT table_name FROM enum_tables").sort
     end
 
     def enum_tables_updated
@@ -67,7 +66,7 @@ class Table
       def initialize(connection, name, max_id=nil)
         @connection = connection
         @name = name
-        @max_id = @connection.execute("SELECT max(id) FROM #{@connection.quote_table_name @name}").to_a[0][0] || 0
+        @max_id = @connection.select_rows("SELECT max(id) FROM #{@connection.quote_table_name @name}").to_a[0][0] || 0
       end
 
       def add(value, id=nil)