access an attribute of a target model in a many-to-many relationship

[Issa N'golo Coulibaly]

Hi, when I try to access an attribute of a target model in a many to many relationship, I get an error : AttributeError: 'ManyRelatedManager' object has no attribute 'full_name'

so, how to do ?

An exemple:

Class Person(models.Model):

    full_name = models.CharField(max_length=200)

    email = models.EmailField()

Class Message(models.Model):

   

    person = models.ManyToManyField(Person)

    title = models.CharField(max_length=200)

    body = models.TextField()

    

I have already created a Person object and Message object to the database:

   

mess = Message.objects.get(title="sos")

print(mess.person.email) // the error occurs here.

[Ryan Nowakowski]

With a ManyToManyField field you're saying that a message can have many people and a person can have many messages. So:

mess.person.email

... doesn't make sense. You'll need to filter for the person whose email you want. Ex:

mess.person.first().email



By the way, the Django documentation recommends[1] that a ManyToManyField be plural to avoid this confusion. So:

people = models.ManyToManyField(Person)

...instead of:

person = models.ManyToManyField(Person)

[1] https://docs.djangoproject.com/en/4.1/topics/db/examples/many_to_many/#many-to-many-relationships

[Viper Code]

mess = Message.objects.get(title="sos")

// print(mess.person.email) // the error occurs here.

emails = []

for m in mess:

    emails.append(m.email)

print(emails)

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