Django access nested object field in serializer

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I Django-Rest have a class User that contain the field first_name, and a class Account that contain the fields username and a_class_ref that is a one-to-one' relation.

How it is possible in the serializer of B to do something like :

class AccountSerializer():

    class Meta:

        model= Account

        fields= [

          'username',

          'firstname` 

        ]

Account :

class Account(models.Model):

    user = models.OneToOneField(

        settings.AUTH_USER_MODEL,

        related_name='account',

        on_delete=models.CASCADE

    )

    def username(self):

        return self.user.username <== this is the solution that I'm trying to avoid

And User is the extended AbstractUser from Django-rest-framework, that comes with a first_name = models.CharField(_('first name'), max_length=30, blank=True)

Thank you

edited Nov 16 '18 at 20:01

asked Nov 16 '18 at 19:16

Boris Le Méec

767522

you will need to create a serializer in order to display the information of a_class_ref, looks for nested serializer in the documentation

– Xepe
Nov 16 '18 at 19:18

Yes but I'd like to do it a way that at the end, the json is not in "nested format", so it's transparent to the user

– Boris Le Méec
Nov 16 '18 at 19:23

May you add the model's code? Also if instead of using those cryptic names you used the real ones it would be easier to help you.

– grouchoboy
Nov 16 '18 at 19:52

add a comment |

I Django-Rest have a class User that contain the field first_name, and a class Account that contain the fields username and a_class_ref that is a one-to-one' relation.

How it is possible in the serializer of B to do something like :

class AccountSerializer():

    class Meta:

        model= Account

        fields= [

          'username',

          'firstname` 

        ]

Account :

class Account(models.Model):

    user = models.OneToOneField(

        settings.AUTH_USER_MODEL,

        related_name='account',

        on_delete=models.CASCADE

    )

    def username(self):

        return self.user.username <== this is the solution that I'm trying to avoid

And User is the extended AbstractUser from Django-rest-framework, that comes with a first_name = models.CharField(_('first name'), max_length=30, blank=True)

Thank you

edited Nov 16 '18 at 20:01

asked Nov 16 '18 at 19:16

Boris Le Méec

767522

you will need to create a serializer in order to display the information of a_class_ref, looks for nested serializer in the documentation

– Xepe
Nov 16 '18 at 19:18

Yes but I'd like to do it a way that at the end, the json is not in "nested format", so it's transparent to the user

– Boris Le Méec
Nov 16 '18 at 19:23

May you add the model's code? Also if instead of using those cryptic names you used the real ones it would be easier to help you.

– grouchoboy
Nov 16 '18 at 19:52

add a comment |

I Django-Rest have a class User that contain the field first_name, and a class Account that contain the fields username and a_class_ref that is a one-to-one' relation.

How it is possible in the serializer of B to do something like :

class AccountSerializer():

    class Meta:

        model= Account

        fields= [

          'username',

          'firstname` 

        ]

Account :

class Account(models.Model):

    user = models.OneToOneField(

        settings.AUTH_USER_MODEL,

        related_name='account',

        on_delete=models.CASCADE

    )

    def username(self):

        return self.user.username <== this is the solution that I'm trying to avoid

And User is the extended AbstractUser from Django-rest-framework, that comes with a first_name = models.CharField(_('first name'), max_length=30, blank=True)

Thank you

edited Nov 16 '18 at 20:01

asked Nov 16 '18 at 19:16

Boris Le Méec

767522

I Django-Rest have a class User that contain the field first_name, and a class Account that contain the fields username and a_class_ref that is a one-to-one' relation.

How it is possible in the serializer of B to do something like :

class AccountSerializer():

    class Meta:

        model= Account

        fields= [

          'username',

          'firstname` 

        ]

Account :

class Account(models.Model):

    user = models.OneToOneField(

        settings.AUTH_USER_MODEL,

        related_name='account',

        on_delete=models.CASCADE

    )

    def username(self):

        return self.user.username <== this is the solution that I'm trying to avoid

And User is the extended AbstractUser from Django-rest-framework, that comes with a first_name = models.CharField(_('first name'), max_length=30, blank=True)

Thank you

python django django-rest-framework

edited Nov 16 '18 at 20:01

asked Nov 16 '18 at 19:16

Boris Le Méec

767522

edited Nov 16 '18 at 20:01

asked Nov 16 '18 at 19:16

Boris Le Méec

767522

edited Nov 16 '18 at 20:01

asked Nov 16 '18 at 19:16

Boris Le Méec

767522

asked Nov 16 '18 at 19:16

Boris Le Méec

767522

asked Nov 16 '18 at 19:16

Boris Le Méec

767522

you will need to create a serializer in order to display the information of a_class_ref, looks for nested serializer in the documentation

– Xepe
Nov 16 '18 at 19:18

Yes but I'd like to do it a way that at the end, the json is not in "nested format", so it's transparent to the user

– Boris Le Méec
Nov 16 '18 at 19:23

May you add the model's code? Also if instead of using those cryptic names you used the real ones it would be easier to help you.

– grouchoboy
Nov 16 '18 at 19:52

add a comment |

you will need to create a serializer in order to display the information of a_class_ref, looks for nested serializer in the documentation

– Xepe
Nov 16 '18 at 19:18

Yes but I'd like to do it a way that at the end, the json is not in "nested format", so it's transparent to the user

– Boris Le Méec
Nov 16 '18 at 19:23

May you add the model's code? Also if instead of using those cryptic names you used the real ones it would be easier to help you.

– grouchoboy
Nov 16 '18 at 19:52

you will need to create a serializer in order to display the information of a_class_ref, looks for nested serializer in the documentation

– Xepe
Nov 16 '18 at 19:18

Yes but I'd like to do it a way that at the end, the json is not in "nested format", so it's transparent to the user

– Boris Le Méec
Nov 16 '18 at 19:23

May you add the model's code? Also if instead of using those cryptic names you used the real ones it would be easier to help you.

– grouchoboy
Nov 16 '18 at 19:52

add a comment |

1 Answer
1

active

oldest

votes

You can declare a custom field with the source attribute:

class BSerializer(serializers.ModelSerializer):

    a_field = serializers.CharField(source='a_class_ref.a_field')



    class Meta:

        model= B

        fields= ['b_field', 'a_field']

Edit

Based on the models you posted, the following should work:

class Account(models.Model):

    user = models.OneToOneField(

        settings.AUTH_USER_MODEL,

        related_name='account',

        on_delete=models.CASCADE

    )



class AccountSerializer(serializers.ModelSerializer):

    username = serializers.CharField(source='user.username')

    firstname = serializers.CharField(source='user.first_name')



    class Meta:

        model= Account

        fields= ['username', 'firstname']

edited Nov 16 '18 at 20:35

answered Nov 16 '18 at 19:23

slider

8,56811331

It sounds like it is exactly what I was looking for, but I still have this exception : django.core.exceptions.ImproperlyConfigured: Field name firstname is not valid for model Account. (Account is B, and firstname is a_field)

– Boris Le Méec
Nov 16 '18 at 19:27

I edited my original post, in B, A is a one-to-one relation field

– Boris Le Méec
Nov 16 '18 at 19:32

@BorisLeMéec you can't directly access a_fileld. Note that I'm going via a_class_ref. What is the field name on Account that you use to reference the other model?

– slider
Nov 16 '18 at 19:34

I wrote firstname = serializers.CharField(source='user.firstname') and user is the one-to-one related field in the B class, that refers to the A class

– Boris Le Méec
Nov 16 '18 at 19:38

1

That was probably a typo mistake, I just copy paste your code and it's working now thank you !

– Boris Le Méec
Nov 16 '18 at 20:41

|
show 5 more comments

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

You can declare a custom field with the source attribute:

class BSerializer(serializers.ModelSerializer):

    a_field = serializers.CharField(source='a_class_ref.a_field')



    class Meta:

        model= B

        fields= ['b_field', 'a_field']

Edit

Based on the models you posted, the following should work:

class Account(models.Model):

    user = models.OneToOneField(

        settings.AUTH_USER_MODEL,

        related_name='account',

        on_delete=models.CASCADE

    )



class AccountSerializer(serializers.ModelSerializer):

    username = serializers.CharField(source='user.username')

    firstname = serializers.CharField(source='user.first_name')



    class Meta:

        model= Account

        fields= ['username', 'firstname']

edited Nov 16 '18 at 20:35

answered Nov 16 '18 at 19:23

slider

8,56811331

It sounds like it is exactly what I was looking for, but I still have this exception : django.core.exceptions.ImproperlyConfigured: Field name firstname is not valid for model Account. (Account is B, and firstname is a_field)

– Boris Le Méec
Nov 16 '18 at 19:27

I edited my original post, in B, A is a one-to-one relation field

– Boris Le Méec
Nov 16 '18 at 19:32

@BorisLeMéec you can't directly access a_fileld. Note that I'm going via a_class_ref. What is the field name on Account that you use to reference the other model?

– slider
Nov 16 '18 at 19:34

I wrote firstname = serializers.CharField(source='user.firstname') and user is the one-to-one related field in the B class, that refers to the A class

– Boris Le Méec
Nov 16 '18 at 19:38

1

That was probably a typo mistake, I just copy paste your code and it's working now thank you !

– Boris Le Méec
Nov 16 '18 at 20:41

|
show 5 more comments

You can declare a custom field with the source attribute:

class BSerializer(serializers.ModelSerializer):

    a_field = serializers.CharField(source='a_class_ref.a_field')



    class Meta:

        model= B

        fields= ['b_field', 'a_field']

Edit

Based on the models you posted, the following should work:

class Account(models.Model):

    user = models.OneToOneField(

        settings.AUTH_USER_MODEL,

        related_name='account',

        on_delete=models.CASCADE

    )



class AccountSerializer(serializers.ModelSerializer):

    username = serializers.CharField(source='user.username')

    firstname = serializers.CharField(source='user.first_name')



    class Meta:

        model= Account

        fields= ['username', 'firstname']

edited Nov 16 '18 at 20:35

answered Nov 16 '18 at 19:23

slider

8,56811331

It sounds like it is exactly what I was looking for, but I still have this exception : django.core.exceptions.ImproperlyConfigured: Field name firstname is not valid for model Account. (Account is B, and firstname is a_field)

– Boris Le Méec
Nov 16 '18 at 19:27

I edited my original post, in B, A is a one-to-one relation field

– Boris Le Méec
Nov 16 '18 at 19:32

@BorisLeMéec you can't directly access a_fileld. Note that I'm going via a_class_ref. What is the field name on Account that you use to reference the other model?

– slider
Nov 16 '18 at 19:34

I wrote firstname = serializers.CharField(source='user.firstname') and user is the one-to-one related field in the B class, that refers to the A class

– Boris Le Méec
Nov 16 '18 at 19:38

1

That was probably a typo mistake, I just copy paste your code and it's working now thank you !

– Boris Le Méec
Nov 16 '18 at 20:41

|
show 5 more comments

You can declare a custom field with the source attribute:

class BSerializer(serializers.ModelSerializer):

    a_field = serializers.CharField(source='a_class_ref.a_field')



    class Meta:

        model= B

        fields= ['b_field', 'a_field']

Edit

Based on the models you posted, the following should work:

class Account(models.Model):

    user = models.OneToOneField(

        settings.AUTH_USER_MODEL,

        related_name='account',

        on_delete=models.CASCADE

    )



class AccountSerializer(serializers.ModelSerializer):

    username = serializers.CharField(source='user.username')

    firstname = serializers.CharField(source='user.first_name')



    class Meta:

        model= Account

        fields= ['username', 'firstname']

edited Nov 16 '18 at 20:35

answered Nov 16 '18 at 19:23

slider

8,56811331

You can declare a custom field with the source attribute:

class BSerializer(serializers.ModelSerializer):

    a_field = serializers.CharField(source='a_class_ref.a_field')



    class Meta:

        model= B

        fields= ['b_field', 'a_field']

Edit

Based on the models you posted, the following should work:

class Account(models.Model):

    user = models.OneToOneField(

        settings.AUTH_USER_MODEL,

        related_name='account',

        on_delete=models.CASCADE

    )



class AccountSerializer(serializers.ModelSerializer):

    username = serializers.CharField(source='user.username')

    firstname = serializers.CharField(source='user.first_name')



    class Meta:

        model= Account

        fields= ['username', 'firstname']

edited Nov 16 '18 at 20:35

answered Nov 16 '18 at 19:23

slider

8,56811331

edited Nov 16 '18 at 20:35

answered Nov 16 '18 at 19:23

slider

8,56811331

answered Nov 16 '18 at 19:23

slider

8,56811331

answered Nov 16 '18 at 19:23

slider

8,56811331

It sounds like it is exactly what I was looking for, but I still have this exception : django.core.exceptions.ImproperlyConfigured: Field name firstname is not valid for model Account. (Account is B, and firstname is a_field)

– Boris Le Méec
Nov 16 '18 at 19:27

I edited my original post, in B, A is a one-to-one relation field

– Boris Le Méec
Nov 16 '18 at 19:32

@BorisLeMéec you can't directly access a_fileld. Note that I'm going via a_class_ref. What is the field name on Account that you use to reference the other model?

– slider
Nov 16 '18 at 19:34

I wrote firstname = serializers.CharField(source='user.firstname') and user is the one-to-one related field in the B class, that refers to the A class

– Boris Le Méec
Nov 16 '18 at 19:38

1

That was probably a typo mistake, I just copy paste your code and it's working now thank you !

– Boris Le Méec
Nov 16 '18 at 20:41

|
show 5 more comments

It sounds like it is exactly what I was looking for, but I still have this exception : django.core.exceptions.ImproperlyConfigured: Field name firstname is not valid for model Account. (Account is B, and firstname is a_field)

– Boris Le Méec
Nov 16 '18 at 19:27

I edited my original post, in B, A is a one-to-one relation field

– Boris Le Méec
Nov 16 '18 at 19:32

@BorisLeMéec you can't directly access a_fileld. Note that I'm going via a_class_ref. What is the field name on Account that you use to reference the other model?

– slider
Nov 16 '18 at 19:34

I wrote firstname = serializers.CharField(source='user.firstname') and user is the one-to-one related field in the B class, that refers to the A class

– Boris Le Méec
Nov 16 '18 at 19:38

1

That was probably a typo mistake, I just copy paste your code and it's working now thank you !

– Boris Le Méec
Nov 16 '18 at 20:41

It sounds like it is exactly what I was looking for, but I still have this exception : django.core.exceptions.ImproperlyConfigured: Field name firstname is not valid for model Account. (Account is B, and firstname is a_field)

– Boris Le Méec
Nov 16 '18 at 19:27

I edited my original post, in B, A is a one-to-one relation field

– Boris Le Méec
Nov 16 '18 at 19:32

@BorisLeMéec you can't directly access a_fileld. Note that I'm going via a_class_ref. What is the field name on Account that you use to reference the other model?

– slider
Nov 16 '18 at 19:34

I wrote firstname = serializers.CharField(source='user.firstname') and user is the one-to-one related field in the B class, that refers to the A class

– Boris Le Méec
Nov 16 '18 at 19:38

That was probably a typo mistake, I just copy paste your code and it's working now thank you !

– Boris Le Méec
Nov 16 '18 at 20:41

|
show 5 more comments

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