fields.py 文件源码

def get_srid(self, geom):
        """
        Returns the default SRID for the given geometry, taking into account
        the SRID set for the field.  For example, if the input geometry
        has no SRID, then that of the field will be returned.
        """
        gsrid = geom.srid  # SRID of given geometry.
        if gsrid is None or self.srid == -1 or (gsrid == -1 and self.srid != -1):
            return self.srid
        else:
            return gsrid

    # ### Routines overloaded from Field ###