Class: ActiveRecord::ConnectionAdapters::PostGIS::SpatialColumnInfo

Inherits:
Object
  • Object
show all
Defined in:
lib/active_record/connection_adapters/postgis/spatial_column_info.rb

Overview

Do spatial sql queries for column info and memoize that info.

Instance Method Summary collapse

Constructor Details

#initialize(adapter, table_name) ⇒ SpatialColumnInfo

Returns a new instance of SpatialColumnInfo.



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# File 'lib/active_record/connection_adapters/postgis/spatial_column_info.rb', line 6

def initialize(adapter, table_name)
  @adapter = adapter
  @table_name = table_name
end

Instance Method Details

#all ⇒ Object 



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# File 'lib/active_record/connection_adapters/postgis/spatial_column_info.rb', line 11

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

#get(column_name, type) ⇒ Object

do not query the database for non-spatial columns/tables



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# File 'lib/active_record/connection_adapters/postgis/spatial_column_info.rb', line 34

def get(column_name, type)
  return unless PostGISAdapter.spatial_column_options(type.to_sym)
  @spatial_column_info ||= all
  @spatial_column_info[column_name]
end