class ActiveRecord::ConnectionAdapters::PostGIS::SpatialColumnInfo
Do spatial sql queries for column info and memoize that info.
Public Class Methods
Source
# File lib/active_record/connection_adapters/postgis/spatial_column_info.rb, line 8 def initialize(adapter, table_name) @adapter = adapter @table_name = table_name end
Public Instance Methods
Source
# File lib/active_record/connection_adapters/postgis/spatial_column_info.rb, line 13 def all info = @adapter.query( "SELECT f_geometry_column,coord_dimension,srid,type FROM geometry_columns WHERE f_table_name='#{@table_name}'" ) result = {} info.each do |row| name = row[0] type = row[3] dimension = row[1].to_i has_m = !!(type =~ /m$/i) type.sub!(/m$/, "") has_z = dimension > 3 || (dimension == 3 && !has_m) result[name] = { dimension: dimension, has_m: has_m, has_z: has_z, name: name, srid: row[2].to_i, type: type, } end result end
Source
# File lib/active_record/connection_adapters/postgis/spatial_column_info.rb, line 38 def get(column_name, type) return unless PostGISAdapter.spatial_column_options(type.to_sym) @spatial_column_info ||= all @spatial_column_info[column_name] end
do not query the database for non-spatial columns/tables