我有一个具有多个通用关系的模型,在我的模板中使用它变得非常复杂。该模型是在“场地”和/或“音乐节”上举行的“演出”或音乐活动,并具有“音乐家”和/或“合奏团”。
复杂的地方在于,每个“演出”都有一个主持人、发起人和代理人。这些被设置为与其他模型(例如“PresenterCompany”)的通用关系。演示者公司可以是同一演出的发起人、演示者或代理,或所有这些人。以下是模型(为参考简化):
class Gig(models.Model):
description = models.CharField(max_length=100, blank=True)
date = models.DateTimeField()
venue = models.ForeignKey(Venue)
festival = models.ForeignKey(Festival, blank = True, null=True)
musician = models.ManyToManyField(Musician, blank=True)
ensembles = models.ManyToManyField(Ensemble, blank = True)
presenter_content_type = models.ForeignKey(ContentType,
limit_choices_to={"model__in": ("Individual", "ArtsOrganization",'Presenter', "BookingAgent","Festival", "OtherOrganization","PresenterCompany", "Venue")}, related_name = "Presenter Type", verbose_name = "Presenter",blank=True, null=True)
presenter_id = models.IntegerField(db_index=True, blank=True, null=True, verbose_name='Presenter ID')
presenter = generic.GenericForeignKey('presenter_content_type','presenter_id')
promoter_content_type = models.ForeignKey(ContentType,
limit_choices_to={"model__in": ("Individual", "ArtsOrganization","BookingAgent","Presenter", "Festival", "OtherOrganization","PresenterCompany", "Venue")}, related_name = "promotor", verbose_name='Promoter Type', blank=True, null=True)
promoter_id = models.IntegerField(db_index=True, blank=True, null=True, verbose_name='Promoter ID')
promoter = generic.GenericForeignKey('promoter_content_type','promoter_id')
agent_content_type = models.ForeignKey(ContentType,
limit_choices_to={"model__in": ("Individual", "BookingAgent")}, related_name="agent", verbose_name='Agent Type', blank=True, null=True)
agent_id = models.IntegerField(db_index=True, blank=True, null=True, verbose_name='Agent ID')
agent = generic.GenericForeignKey('agent_content_type','agent_id')
class PresenterCompany(models.Model):
name = models.CharField(max_length=70)
address =GenericRelation(Address)
presented_gig = GenericRelation('Gig',
content_type_field='presenter_content_type',
object_id_field='presenter_id',
related_name='presenter_presented_gig'
)
promoted_gig = GenericRelation('Gig',
content_type_field='promoter_content_type',
object_id_field='promoter_id',
related_name='presenter_promoted_gig'
)
booked_gig = GenericRelation('Gig',
content_type_field='promoter_content_type',
object_id_field='promoter_id',
related_name='presenter_booked_gig'
)
主要问题是,当我尝试为演示者公司获取所有演出时,我必须为每个角色编写三个不同的 for 循环,即 {% for gig in presentercompany.presented_gig.all %},等等......这似乎是多余的代码。
有没有更好的方法来构建它,例如为演示者、发起者和代理使用中间模型?谢谢你的建议!