Django2.0.7 TypeError: Model instances without primary key value are unhashable

-1

I am trying to migrate the models that were generated for me via python manage.py inspectdb. I tried python manage.py makemigrations and got this error:

SystemCheckError: System check identified some issues:

ERRORS:

Users.DjangoContentType: (models.E004) 'id' can only be used as a field name if the field also sets 'primary_key=True'.

So I went into my file and changed this model:
enter image description here

To this:
enter image description here

and when I run python manage.py makemigrations and python manage.py migrate and I get this error:

enter image description here

Any idea what I should do/what this means?

This is my pip freeze output:

certifi==2018.10.15

Django==2.0.7

mysqlclient==1.3.13

pytz==2018.7

asked Nov 24 '18 at 18:15

Joel Castro

517

just remove the id field from your model. because its already present and its primary key

– ruddra
Nov 24 '18 at 18:27

Then I get this error: TypeError: Model instances without primary key value are unhashable

– Joel Castro
Nov 24 '18 at 18:29

Why are you including DjangoContentType as part of your models? I’m quite sure you shouldn't as it is part of the content_types application

– ivissani
Nov 24 '18 at 22:06

The ContentType model is used by Django to track the models in te installed apps in a Django project. It is automatically populated by Django and you should not need to mess around with it in most cases

– ivissani
Nov 24 '18 at 22:11

Don't post pictures of text.

– Daniel Roseman
Nov 24 '18 at 22:13

|
show 2 more comments

-1

I am trying to migrate the models that were generated for me via python manage.py inspectdb. I tried python manage.py makemigrations and got this error:

SystemCheckError: System check identified some issues:

ERRORS:

Users.DjangoContentType: (models.E004) 'id' can only be used as a field name if the field also sets 'primary_key=True'.

So I went into my file and changed this model:
enter image description here

To this:
enter image description here

and when I run python manage.py makemigrations and python manage.py migrate and I get this error:

enter image description here

Any idea what I should do/what this means?

This is my pip freeze output:

certifi==2018.10.15

Django==2.0.7

mysqlclient==1.3.13

pytz==2018.7

asked Nov 24 '18 at 18:15

Joel Castro

517

just remove the id field from your model. because its already present and its primary key

– ruddra
Nov 24 '18 at 18:27

Then I get this error: TypeError: Model instances without primary key value are unhashable

– Joel Castro
Nov 24 '18 at 18:29

Why are you including DjangoContentType as part of your models? I’m quite sure you shouldn't as it is part of the content_types application

– ivissani
Nov 24 '18 at 22:06

The ContentType model is used by Django to track the models in te installed apps in a Django project. It is automatically populated by Django and you should not need to mess around with it in most cases

– ivissani
Nov 24 '18 at 22:11

Don't post pictures of text.

– Daniel Roseman
Nov 24 '18 at 22:13

|
show 2 more comments

-1

I am trying to migrate the models that were generated for me via python manage.py inspectdb. I tried python manage.py makemigrations and got this error:

SystemCheckError: System check identified some issues:

ERRORS:

Users.DjangoContentType: (models.E004) 'id' can only be used as a field name if the field also sets 'primary_key=True'.

So I went into my file and changed this model:
enter image description here

To this:
enter image description here

and when I run python manage.py makemigrations and python manage.py migrate and I get this error:

enter image description here

Any idea what I should do/what this means?

This is my pip freeze output:

certifi==2018.10.15

Django==2.0.7

mysqlclient==1.3.13

pytz==2018.7

asked Nov 24 '18 at 18:15

Joel Castro

517

I am trying to migrate the models that were generated for me via python manage.py inspectdb. I tried python manage.py makemigrations and got this error:

SystemCheckError: System check identified some issues:

ERRORS:

Users.DjangoContentType: (models.E004) 'id' can only be used as a field name if the field also sets 'primary_key=True'.

So I went into my file and changed this model:
enter image description here

To this:
enter image description here

and when I run python manage.py makemigrations and python manage.py migrate and I get this error:

enter image description here

Any idea what I should do/what this means?

This is my pip freeze output:

certifi==2018.10.15

Django==2.0.7

mysqlclient==1.3.13

pytz==2018.7

django python-3.x django-models

asked Nov 24 '18 at 18:15

Joel Castro

517

asked Nov 24 '18 at 18:15

Joel Castro

517

asked Nov 24 '18 at 18:15

Joel Castro

517

asked Nov 24 '18 at 18:15

Joel Castro

517

asked Nov 24 '18 at 18:15

Joel Castro

517

just remove the id field from your model. because its already present and its primary key

– ruddra
Nov 24 '18 at 18:27

Then I get this error: TypeError: Model instances without primary key value are unhashable

– Joel Castro
Nov 24 '18 at 18:29

Why are you including DjangoContentType as part of your models? I’m quite sure you shouldn't as it is part of the content_types application

– ivissani
Nov 24 '18 at 22:06

The ContentType model is used by Django to track the models in te installed apps in a Django project. It is automatically populated by Django and you should not need to mess around with it in most cases

– ivissani
Nov 24 '18 at 22:11

Don't post pictures of text.

– Daniel Roseman
Nov 24 '18 at 22:13

|
show 2 more comments

just remove the id field from your model. because its already present and its primary key

– ruddra
Nov 24 '18 at 18:27

Then I get this error: TypeError: Model instances without primary key value are unhashable

– Joel Castro
Nov 24 '18 at 18:29

Why are you including DjangoContentType as part of your models? I’m quite sure you shouldn't as it is part of the content_types application

– ivissani
Nov 24 '18 at 22:06

The ContentType model is used by Django to track the models in te installed apps in a Django project. It is automatically populated by Django and you should not need to mess around with it in most cases

– ivissani
Nov 24 '18 at 22:11

Don't post pictures of text.

– Daniel Roseman
Nov 24 '18 at 22:13

just remove the id field from your model. because its already present and its primary key

– ruddra
Nov 24 '18 at 18:27

Then I get this error: TypeError: Model instances without primary key value are unhashable

– Joel Castro
Nov 24 '18 at 18:29

Why are you including DjangoContentType as part of your models? I’m quite sure you shouldn't as it is part of the content_types application

– ivissani
Nov 24 '18 at 22:06

The ContentType model is used by Django to track the models in te installed apps in a Django project. It is automatically populated by Django and you should not need to mess around with it in most cases

– ivissani
Nov 24 '18 at 22:11

Don't post pictures of text.

– Daniel Roseman
Nov 24 '18 at 22:13

|
show 2 more comments

2 Answers
2

active

oldest

votes

ID is an implicitly declared field in django. You dont need to add it in list of model fields. Django autogenerates ID for you.

An id field is added automatically, but this behavior can be overridden. See Automatic primary key fields.

https://docs.djangoproject.com/en/2.1/topics/db/models/

answered Nov 24 '18 at 18:32

Nithin K

yes, but when I remove those fields and get this error: TypeError: Model instances without primary key value are unhashable

– Joel Castro
Nov 24 '18 at 18:48

Is there an already existing table in your db called django_content_type ? Which DB you are using ? I think you shouldn''t be using managed=False if there is no existing table that you want to manage.

– Nithin K
Nov 25 '18 at 10:13

I'm using mysql, and when I initially did python inspectdb and then python manage.py makemigrations and then python manage.py migrate, I got this error: django.db.utils.ProgrammingError: (1146, "Table 'mydb.django_content_type' doesn't exist") so I manually added the table to my database;

– Joel Castro
Nov 25 '18 at 16:11

Please delete all the tables, remove meta classes, Run migrations using python manage.py migrate <appname> See what error it is giving

– Nithin K
Nov 27 '18 at 13:11

add a comment |

So I dropped my database and reinitialized it, and all the steps that I initially took worked... somehow. Still can't explain why

answered Nov 27 '18 at 22:32

Joel Castro

517

add a comment |

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2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

ID is an implicitly declared field in django. You dont need to add it in list of model fields. Django autogenerates ID for you.

An id field is added automatically, but this behavior can be overridden. See Automatic primary key fields.

https://docs.djangoproject.com/en/2.1/topics/db/models/

answered Nov 24 '18 at 18:32

Nithin K

yes, but when I remove those fields and get this error: TypeError: Model instances without primary key value are unhashable

– Joel Castro
Nov 24 '18 at 18:48

Is there an already existing table in your db called django_content_type ? Which DB you are using ? I think you shouldn''t be using managed=False if there is no existing table that you want to manage.

– Nithin K
Nov 25 '18 at 10:13

I'm using mysql, and when I initially did python inspectdb and then python manage.py makemigrations and then python manage.py migrate, I got this error: django.db.utils.ProgrammingError: (1146, "Table 'mydb.django_content_type' doesn't exist") so I manually added the table to my database;

– Joel Castro
Nov 25 '18 at 16:11

Please delete all the tables, remove meta classes, Run migrations using python manage.py migrate <appname> See what error it is giving

– Nithin K
Nov 27 '18 at 13:11

add a comment |

ID is an implicitly declared field in django. You dont need to add it in list of model fields. Django autogenerates ID for you.

An id field is added automatically, but this behavior can be overridden. See Automatic primary key fields.

https://docs.djangoproject.com/en/2.1/topics/db/models/

answered Nov 24 '18 at 18:32

Nithin K

yes, but when I remove those fields and get this error: TypeError: Model instances without primary key value are unhashable

– Joel Castro
Nov 24 '18 at 18:48

Is there an already existing table in your db called django_content_type ? Which DB you are using ? I think you shouldn''t be using managed=False if there is no existing table that you want to manage.

– Nithin K
Nov 25 '18 at 10:13

I'm using mysql, and when I initially did python inspectdb and then python manage.py makemigrations and then python manage.py migrate, I got this error: django.db.utils.ProgrammingError: (1146, "Table 'mydb.django_content_type' doesn't exist") so I manually added the table to my database;

– Joel Castro
Nov 25 '18 at 16:11

Please delete all the tables, remove meta classes, Run migrations using python manage.py migrate <appname> See what error it is giving

– Nithin K
Nov 27 '18 at 13:11

add a comment |

ID is an implicitly declared field in django. You dont need to add it in list of model fields. Django autogenerates ID for you.

An id field is added automatically, but this behavior can be overridden. See Automatic primary key fields.

https://docs.djangoproject.com/en/2.1/topics/db/models/

answered Nov 24 '18 at 18:32

Nithin K

ID is an implicitly declared field in django. You dont need to add it in list of model fields. Django autogenerates ID for you.

An id field is added automatically, but this behavior can be overridden. See Automatic primary key fields.

https://docs.djangoproject.com/en/2.1/topics/db/models/

answered Nov 24 '18 at 18:32

Nithin K

answered Nov 24 '18 at 18:32

Nithin K

answered Nov 24 '18 at 18:32

Nithin K

answered Nov 24 '18 at 18:32

Nithin K

yes, but when I remove those fields and get this error: TypeError: Model instances without primary key value are unhashable

– Joel Castro
Nov 24 '18 at 18:48

Is there an already existing table in your db called django_content_type ? Which DB you are using ? I think you shouldn''t be using managed=False if there is no existing table that you want to manage.

– Nithin K
Nov 25 '18 at 10:13

I'm using mysql, and when I initially did python inspectdb and then python manage.py makemigrations and then python manage.py migrate, I got this error: django.db.utils.ProgrammingError: (1146, "Table 'mydb.django_content_type' doesn't exist") so I manually added the table to my database;

– Joel Castro
Nov 25 '18 at 16:11

Please delete all the tables, remove meta classes, Run migrations using python manage.py migrate <appname> See what error it is giving

– Nithin K
Nov 27 '18 at 13:11

add a comment |

yes, but when I remove those fields and get this error: TypeError: Model instances without primary key value are unhashable

– Joel Castro
Nov 24 '18 at 18:48

Is there an already existing table in your db called django_content_type ? Which DB you are using ? I think you shouldn''t be using managed=False if there is no existing table that you want to manage.

– Nithin K
Nov 25 '18 at 10:13

I'm using mysql, and when I initially did python inspectdb and then python manage.py makemigrations and then python manage.py migrate, I got this error: django.db.utils.ProgrammingError: (1146, "Table 'mydb.django_content_type' doesn't exist") so I manually added the table to my database;

– Joel Castro
Nov 25 '18 at 16:11

Please delete all the tables, remove meta classes, Run migrations using python manage.py migrate <appname> See what error it is giving

– Nithin K
Nov 27 '18 at 13:11

yes, but when I remove those fields and get this error: TypeError: Model instances without primary key value are unhashable

– Joel Castro
Nov 24 '18 at 18:48

Is there an already existing table in your db called django_content_type ? Which DB you are using ? I think you shouldn''t be using managed=False if there is no existing table that you want to manage.

– Nithin K
Nov 25 '18 at 10:13

I'm using mysql, and when I initially did python inspectdb and then python manage.py makemigrations and then python manage.py migrate, I got this error: django.db.utils.ProgrammingError: (1146, "Table 'mydb.django_content_type' doesn't exist") so I manually added the table to my database;

– Joel Castro
Nov 25 '18 at 16:11

Please delete all the tables, remove meta classes, Run migrations using python manage.py migrate <appname> See what error it is giving

– Nithin K
Nov 27 '18 at 13:11

add a comment |

So I dropped my database and reinitialized it, and all the steps that I initially took worked... somehow. Still can't explain why

answered Nov 27 '18 at 22:32

Joel Castro

517

add a comment |

So I dropped my database and reinitialized it, and all the steps that I initially took worked... somehow. Still can't explain why

answered Nov 27 '18 at 22:32

Joel Castro

517

add a comment |

So I dropped my database and reinitialized it, and all the steps that I initially took worked... somehow. Still can't explain why

answered Nov 27 '18 at 22:32

Joel Castro

517

So I dropped my database and reinitialized it, and all the steps that I initially took worked... somehow. Still can't explain why

answered Nov 27 '18 at 22:32

Joel Castro

517

answered Nov 27 '18 at 22:32

Joel Castro

517

answered Nov 27 '18 at 22:32

Joel Castro

517

answered Nov 27 '18 at 22:32

Joel Castro

517

add a comment |

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