diff options
Diffstat (limited to 'activerecord/lib/active_record/connection_adapters/postgresql/utils.rb')
-rw-r--r-- | activerecord/lib/active_record/connection_adapters/postgresql/utils.rb | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/utils.rb b/activerecord/lib/active_record/connection_adapters/postgresql/utils.rb new file mode 100644 index 0000000000..0290bcb48c --- /dev/null +++ b/activerecord/lib/active_record/connection_adapters/postgresql/utils.rb @@ -0,0 +1,66 @@ +module ActiveRecord + module ConnectionAdapters + module PostgreSQL + # Value Object to hold a schema qualified name. + # This is usually the name of a PostgreSQL relation but it can also represent + # schema qualified type names. +schema+ and +identifier+ are unquoted to prevent + # double quoting. + class Name # :nodoc: + SEPARATOR = "." + attr_reader :schema, :identifier + + def initialize(schema, identifier) + @schema, @identifier = unquote(schema), unquote(identifier) + end + + def to_s + parts.join SEPARATOR + end + + def quoted + parts.map { |p| PGconn.quote_ident(p) }.join SEPARATOR + end + + def ==(o) + o.class == self.class && o.parts == parts + end + alias_method :eql?, :== + + def hash + parts.hash + end + + protected + def unquote(part) + return unless part + part.gsub(/(^"|"$)/,'') + end + + def parts + @parts ||= [@schema, @identifier].compact + end + end + + module Utils # :nodoc: + extend self + + # Returns an instance of <tt>ActiveRecord::ConnectionAdapters::PostgreSQL::Name</tt> + # extracted from +string+. + # +schema+ is nil if not specified in +string+. + # +schema+ and +identifier+ exclude surrounding quotes (regardless of whether provided in +string+) + # +string+ supports the range of schema/table references understood by PostgreSQL, for example: + # + # * <tt>table_name</tt> + # * <tt>"table.name"</tt> + # * <tt>schema_name.table_name</tt> + # * <tt>schema_name."table.name"</tt> + # * <tt>"schema_name".table_name</tt> + # * <tt>"schema.name"."table name"</tt> + def extract_schema_qualified_name(string) + table, schema = string.scan(/[^".\s]+|"[^"]*"/)[0..1].reverse + PostgreSQL::Name.new(schema, table) + end + end + end + end +end |