manytomany field not working django-cms

Question

I am using django-cms many to many field is working fine when i add plugins or update but after publish page i didn't get any data where i add many to many field.

models are look like this

@python_2_unicode_compatible
class ClientLogo(CMSPlugin):
  client_logo = models.ManyToManyField(LogoPluginModel, blank=True)

class LogoPluginModel(CMSPlugin):
  title = models.CharField(max_length=100)

here field 'client_logo' will be disapper when i publish djagno-cms page

Answer 1

The relations need to be explicitly copied through the copy_relations method (see django-cms models manual). It's also advantageous to add a related_name property to the ManyToManyField, especially when a model contains multiple sets of foreign keys or ManyToManyFields.

@python_2_unicode_compatible
class ClientLogo(CMSPlugin):
  client_logo = models.ManyToManyField(
    LogoPluginModel,
    blank=True,
    related_name='client_logos',
  )


class LogoPluginModel(CMSPlugin):
  title = models.CharField(max_length=100)

  def copy_relations(self, oldinstance):
    self.client_logos.all().delete()
    for logo in oldinstance.client_logos.all():
      logo.pk = None
      logo.showroom = self
      logo.save()