Summary
In this chapter, we continued our implementation of the ShapeEditor by adding three important functions: the "list" view, and the ability to import and export shapefiles. While these aren't very exciting features, they are a crucial part of the ShapeEditor.
In the process of implementing these features, we have learned the following:
Using Django's templating language to display a list of records within a web page.
Using the
zipfilestandard library module to extract the contents of an uploaded shapefile before opening that shapefile using OGR.You will need to "wrap" Polygon and LineString geometries when importing data from a shapefile into a PostGIS database, to avoid problems caused by a shapefile's inability to distinguish between Polygons and MultiPolygons, and between LineStrings and MultiLineStrings.
When you call the
object.delete()method, Django automatically deletes all the linked records for you, simplifying the process of removing a record and all its associated data.You...
