Changed the property that holds the minimum age required for Students to participate in a GHOP based program.
Added a new property student_min_age_as_of to hold the DateTime from when the minimum age should be reached. Changed student_min_age property to now store the student minimum age as an integer.
This all feel more user friendly then letting the program admin calculate the required DateTime. Storing the two properties is then still needed in this case since information might be lost otherwise when the program admin brings up the edit view.
Reviewed by: Lennard de Rijk
from django.db import connection
from django.db.models.fields import Field # Django base Field class
from django.contrib.gis.db.backend.mysql.query import GEOM_FROM_TEXT
# Quotename & geographic quotename, respectively.
qn = connection.ops.quote_name
class MySQLGeoField(Field):
"""
The backend-specific geographic field for MySQL.
"""
def _geom_index(self, style, db_table):
"""
Creates a spatial index for the geometry column. If MyISAM tables are
used an R-Tree index is created, otherwise a B-Tree index is created.
Thus, for best spatial performance, you should use MyISAM tables
(which do not support transactions). For more information, see Ch.
16.6.1 of the MySQL 5.0 documentation.
"""
# Getting the index name.
idx_name = '%s_%s_id' % (db_table, self.column)
sql = style.SQL_KEYWORD('CREATE SPATIAL INDEX ') + \
style.SQL_TABLE(qn(idx_name)) + \
style.SQL_KEYWORD(' ON ') + \
style.SQL_TABLE(qn(db_table)) + '(' + \
style.SQL_FIELD(qn(self.column)) + ');'
return sql
def _post_create_sql(self, style, db_table):
"""
Returns SQL that will be executed after the model has been
created.
"""
# Getting the geometric index for this Geometry column.
if self._index:
return (self._geom_index(style, db_table),)
else:
return ()
def db_type(self):
"The OpenGIS name is returned for the MySQL database column type."
return self._geom
def get_placeholder(self, value):
"""
The placeholder here has to include MySQL's WKT constructor. Because
MySQL does not support spatial transformations, there is no need to
modify the placeholder based on the contents of the given value.
"""
return '%s(%%s)' % GEOM_FROM_TEXT