Caching results from geometry_columns

lib/spatial_adapter/postgresql.rb

@@ -213,29 +213,34 @@ def tables_without_postgis
     end
 
     def column_spatial_info(table_name)
-      constr = query("SELECT * FROM geometry_columns WHERE f_table_name = '#{table_name}'")
-
-      raw_geom_infos = {}
-      constr.each do |constr_def_a|
-        raw_geom_infos[constr_def_a[3]] ||= SpatialAdapter::RawGeomInfo.new
-        raw_geom_infos[constr_def_a[3]].type = constr_def_a[6]
-        raw_geom_infos[constr_def_a[3]].dimension = constr_def_a[4].to_i
-        raw_geom_infos[constr_def_a[3]].srid = constr_def_a[5].to_i
-
-        if raw_geom_infos[constr_def_a[3]].type[-1] == ?M
-          raw_geom_infos[constr_def_a[3]].with_m = true
-          raw_geom_infos[constr_def_a[3]].type.chop!
-        else
-          raw_geom_infos[constr_def_a[3]].with_m = false
+      cache = @raw_geom_infos_cache ||= Hash.new
+
+      if !cache[table_name]
+        constr = query("SELECT * FROM geometry_columns WHERE f_table_name = '#{table_name}'")
+
+        raw_geom_infos = {}
+        constr.each do |constr_def_a|
+          raw_geom_infos[constr_def_a[3]] ||= SpatialAdapter::RawGeomInfo.new
+          raw_geom_infos[constr_def_a[3]].type = constr_def_a[6]
+          raw_geom_infos[constr_def_a[3]].dimension = constr_def_a[4].to_i
+          raw_geom_infos[constr_def_a[3]].srid = constr_def_a[5].to_i
+
+          if raw_geom_infos[constr_def_a[3]].type[-1] == ?M
+            raw_geom_infos[constr_def_a[3]].with_m = true
+            raw_geom_infos[constr_def_a[3]].type.chop!
+          else
+            raw_geom_infos[constr_def_a[3]].with_m = false
+          end
         end
-      end
 
-      raw_geom_infos.each_value do |raw_geom_info|
-        #check the presence of z and m
-        raw_geom_info.convert!
+        raw_geom_infos.each_value do |raw_geom_info|
+          #check the presence of z and m
+          raw_geom_info.convert!
+        end
+        cache[table_name] = raw_geom_infos
       end
-
-      raw_geom_infos
+      @raw_geom_infos_cache = cache
+      cache[table_name]
     end
   end