Cassandra CQL Object Mapper for Python
cqlengine is a Cassandra CQL 3 Object Mapper for Python. cqlengine is part of the Datastax python driver for Cassandra
Questions tagged [cqlengine]
72 questions
0
votes
1 answer
Cassandra ORM - AttributeError: 'NoneType' object has no attribute 'replace'
I've a following ColumnFamily
class UniqueUserDealAction(models.Model):
deal_id = columns.Text(primary_key=True)
action = columns.Text(primary_key=True)
imei1 = columns.Text(primary_key=True)
imei2 = columns.Text(primary_key=True)
…
Praful Bagai
- 16,684
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Cassandra's Python CQLEngine model inheritance
I have the following object model:
class Data(Model):
__keyspace__ = 'varilog'
__table_name__ = 'md_data'
id = columns.TimeUUID(partition_key=True, primary_key=True, required=True)
device = columns.Text(primary_key=True, required=True)
…
Cedric H.
- 7,980
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- 82
0
votes
1 answer
Query records which are greater than today's date using cqlengine
I want to query a record which are having today's date. The cql code am trying is given below
cron = Cron.objects.filter(user_id = 5)
cron= cron.filter(created_at__gte = datetime.combine(datetime.now().date(), datetime.min.time()))
…
user4130072
- 137
- 4
- 17
0
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1 answer
Unable to create more than two table using sync_table() in cqlengine
I have the following class in python and am using cqlengine as object mapper for cassandra DB,
class Company(Model):
id = columns.Integer(index=True, primary_key=True)
company_name = columns.Text(required=False)
created_at =…
user4130072
- 137
- 4
- 17
0
votes
1 answer
CQLEngineException when running inside VPN
I keep getting this error when using django-cassandra-engine on a EC2 instance inside a VPN.
CQLEngineException: It is required to setup() cqlengine before executing queries.
It seems to run properly when running on a EC2 instance outside the…
TheGeorgeous
- 3,927
- 2
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- 33
0
votes
1 answer
Create and change to new keyspace with Cassandra cqlengine?
Let's say we connect to some Cassandra cluster:
cqlengine.connection.setup('hostname', 'some_keyspace')
The method requires that we know at least one existing keyspace.
What if we don't?
What if we simply wish to check if a keyspace exists and…
AturSams
- 7,568
- 18
- 64
- 98
0
votes
1 answer
How to tell if CQLEngine made an insert or update through the Model class Save
I am using Python3.4 and CQLEngine. In my code, I am saving an object in an overloaded save operator as follows:
Class Foo(Model, ...):
id = columns.Integer(primary_key)=True
bar = column.Text()
...
def save(self):
…
Ryan Kuhl
- 90
- 7
0
votes
2 answers
How do I represent a cassandra user defined type in a python model in cqlengine
I have the following table schema defined in my cassandra cluster
CREATE TABLE users (
username text PRIMARY KEY,
creationdate bigint,
email text,
firstlogin boolean,
firstname text,
lastloggedin bigint,
lastname text,
lastprofileupdate bigint,
name…
Jome
- 1,285
- 2
- 11
- 20
0
votes
2 answers
Setup Cassandra DB in django using cqlengine but without using django-cassandra-engine
I'm a Django beginner and have developed 1 app using mysql as primary DB, but in my next project I have to use Cassandra db using https://github.com/cqlengine/cqlengine but do not use https://github.com/r4fek/django-cassandra-engine (which is a…
xyz
- 197
- 3
- 16
0
votes
1 answer
cqlengine: way to create nested map
In what ways we can create a nested map in cqlengine models, For e.g
class Test(Model):
id = columns.UUID(primary_key=True, default=uuid.uuid4)
address = columns.Map(key_type, value_type)
I want "value_type"(in address column) to be a…
Neo
- 5,070
- 10
- 46
- 65
0
votes
1 answer
Data model design doubts on cqlengine(Cassandra CQL 3 Object Mapper for Python)
I am using cqlengine, I had few doubts:
If we have a model defined as
class Contact(Model):
street = columns.Text()
city = columns.Text()
Can we do something like this
Reference to contact model like mentioned in code below
class…
Neo
- 5,070
- 10
- 46
- 65
0
votes
1 answer
Bad Request: Unknown identifier id
when I'm trying to run my program and insert a record in Cassandra database from Django framework, an error says that: Bad Request: Unknown identifier id
What should I do?
This is the error:
CQLEngineException at /registered/
Bad Request: Unknown…
ehsan shirzadi
- 4,709
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