PostgreSQL casting in Rails using the x::typename construct and ActiveRecord's where method

pg_cast.rb

# Experiment, only tested under Rails 3.2.16, not sure how useful it really is...
# "Works" only with where conditions using a Hash
#
# Example:
# User.where :created_at::date => "2014-01-01"  # :created_at is a timestamp
#

module PgCast
  # All of these are not really viable
  TYPES = %w[any char abstime aclitem anyarray anyelement anyenum anynonarray bigint bit bit varying boolean box bytea character character varying cid cidr circle cstring date double precision gtsvector inet int2vector integer internal interval language_handler line lseg macaddr money name numeric oid oidvector opaque path point polygon real record refcursor regclass regconfig regdictionary regoper regoperator regproc regprocedure regtype reltime smallint smgr text tid time with time zone time without time zone timestamp with time zone timestamp without time zone tinterval trigger tsquery tsvector txid_snapshot unknown uuid void xid xml]

  class TypeCast < Struct.new(:column, :type)
    def to_s
      self
    end

    def to_sym
      self
    end
  end

  module Symbol
    TYPES.each do |type|
      type.strip!
      define_method(type) do
        TypeCast.new(self, type)
      end
    end
  end
end

class ActiveRecord::ConnectionAdapters::PostgreSQLAdapter
  def quote_column_name(name)
    !name.is_a?(PgCast::TypeCast) ?
      PGconn.quote_ident(name.to_s) :
      PGconn.quote_ident(name.column.to_s) << "::#{name.type}"  
  end
end

Symbol.send(:include, PgCast::Symbol)