Synnefo

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from django.db.models import (Model, BigIntegerField, CharField, DateTimeField,

                              ForeignKey, AutoField)

class Holding(Model):

    holder = CharField(max_length=4096, db_index=True)

    source = CharField(max_length=4096, null=True)

    resource = CharField(max_length=4096, null=False)

    limit = BigIntegerField()

    usage_min = BigIntegerField(default=0)

    usage_max = BigIntegerField(default=0)

    class Meta:

        unique_together = (('holder', 'source', 'resource'),)

class Commission(Model):

    serial = AutoField(primary_key=True)

    name = CharField(max_length=4096, default="")

    clientkey = CharField(max_length=4096, null=False)

    issue_datetime = DateTimeField()

class Provision(Model):

    serial = ForeignKey(Commission,

                        to_field='serial',

                        related_name='provisions')

    holder = CharField(max_length=4096, db_index=True)

    source = CharField(max_length=4096, null=True)

    resource = CharField(max_length=4096, null=False)

    quantity = BigIntegerField()

    def todict(self):

        return {'holder':   self.holder,

                'source':   self.source,

                'resource': self.resource,

                'quantity': self.quantity,

                }

    def holding_key(self):

        return (self.holder, self.source, self.resource)

class ProvisionLog(Model):

    serial = BigIntegerField()

    name = CharField(max_length=4096)

    issue_time = CharField(max_length=4096)

    log_time = CharField(max_length=4096)

    holder = CharField(max_length=4096)

    source = CharField(max_length=4096, null=True)

    resource = CharField(max_length=4096)

    limit = BigIntegerField()

    usage_min = BigIntegerField()

    usage_max = BigIntegerField()

    delta_quantity = BigIntegerField()

    reason = CharField(max_length=4096)