Owlready - Problem when instantiating sub-class of owl.Thing

Owlready

Problem when instantiating sub-class of owl.Thing

Posted by cracoras on
URL: http://owlready.306.s1.nabble.com/Problem-when-instantiating-sub-class-of-owl-Thing-tp1659.html

I am running into the following issue when using owlready2 to define and instantiate my ontology classes.
- The scenario is that I have 1 class that is defined at run time, that inherits from a class that is defined based on a type: MasterData or Transaction, which on its turn, inherits from the BusinessDocument.
- The BusinessDocument class needs to inherit from the Thing module that is imported in my package.

The following code has been implemented to create all the classes in the chain:

from owlready2 import *

with onto:
class BusinessDocument(Thing):
@staticmethod
def get_class(doc_type):
switch = {
'MasterData': MasterData,
'Transactional': Transactional
}
cls = switch.get(doc_type, lambda: "Invalid Noun Type")
return cls

def __init__(self, doc_id, location, doc_type, color, size):
self.doc_id = doc_id
self.location = location
self.doc_type = doc_type
self.color = color
self.size = size

@property
def get_location(self):
return self.location

@property
def get_doc_id(self):
return self.doc_id

with onto:
class MasterData(BusinessDocument):
def __init__(self, doc_id, location, color, size):
BusinessDocument.__init__(self, doc_id, location, color, size, 'MasterData')

with onto:
class Transactional(BusinessDocument):
def __init__(self, doc_id, location, color, size):
BusinessDocument.__init__(self, doc_id, location, color, size, 'Transactional')

with onto:
class NounClass():
@staticmethod
def get_class(doc_name, doc_type):
return type(doc_name, (BusinessDocument.get_class(doc_type),
BusinessDocument, ),dict.fromkeys(['doc_id', 'location', 'color', 'size',]))

At run time when I get the doc_name and I get a new class, but when I try to instantiate.

```
invoice_cls = NounClass.get_class('Invoice', 'Transactional')
my_invoice = invoice_cls('IN-1234', 'New York', 'blue', 'big')
```

Calls to the type() and __mro__() methods for the invoice_cls gives me the following information:

DEBUG:app.__main__:Type of from_noun is [(bod_ontology.Invoice, bod_ontology.MasterData, bod_ontology.BusinessDocument, owl.Thing, <class 'object'>)]
DEBUG:app.__main__:Class type is [<class 'owlready2.entity.ThingClass'>]

But then I get an exception thrown related to the `__new__()` method:

DEBUG:app.__main__:Type of from_noun is [(bod_ontology.BillFromPartyMaster, bod_ontology.MasterData, bod_ontology.BusinessObjectDocument, owl.Thing, <class 'object'>)]
DEBUG:app.__main__:Class type is [<class 'owlready2.entity.ThingClass'>]
File "/Users/cracoras/PycharmProjects/bod2owl/app/convert_data.py", line 167, in parse_xml
my_invoice = invoice_cls('IN-1234', 'New York', 'blue', 'big')
--- Logging error ---
Traceback (most recent call last):
File "/Users/cracoras/PycharmProjects/bod2owl/app/convert_data.py", line 167, in parse_xml
my_invoice = invoice_cls('IN-1234', 'New York', 'blue', 'big')
TypeError: __new__() takes from 1 to 3 positional arguments but 5 were given

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/Users/cracoras/.pyenv/versions/3.8.1/lib/python3.8/logging/__init__.py", line 1081, in emit
msg = self.format(record)
File "/Users/cracoras/.pyenv/versions/3.8.1/lib/python3.8/logging/__init__.py", line 925, in format
return fmt.format(record)
File "/Users/cracoras/.pyenv/versions/3.8.1/lib/python3.8/logging/__init__.py", line 664, in format
record.message = record.getMessage()
File "/Users/cracoras/.pyenv/versions/3.8.1/lib/python3.8/logging/__init__.py", line 369, in getMessage
msg = msg % self.args
TypeError: must be real number, not TypeError
Call stack:
File "/Applications/PyCharm.app/Contents/helpers/pydev/pydevd.py", line 1758, in <module>
main()
File "/Applications/PyCharm.app/Contents/helpers/pydev/pydevd.py", line 1752, in main
globals = debugger.run(setup['file'], None, None, is_module)
File "/Applications/PyCharm.app/Contents/helpers/pydev/pydevd.py", line 1147, in run
pydev_imports.execfile(file, globals, locals) # execute the script
File "/Applications/PyCharm.app/Contents/helpers/pydev/_pydev_imps/_pydev_execfile.py", line 18, in execfile
exec(compile(contents+"\n", file, 'exec'), glob, loc)
File "/Users/cracoras/PycharmProjects/bod2owl/app/convert_data.py", line 520, in <module>
exit(main())
File "/Users/cracoras/PycharmProjects/bod2owl/app/convert_data.py", line 515, in main
query_database()
File "/Users/cracoras/PycharmProjects/bod2owl/app/convert_data.py", line 103, in query_database
csv_record = parse_xml(bod_type, date_time, from_lid, tenant, xml_string)
File "/Users/cracoras/PycharmProjects/bod2owl/app/convert_data.py", line 174, in parse_xml
log.debug("Got an error [%e]", e)
Arguments: (TypeError('__new__() takes from 1 to 3 positional arguments but 5 were given'),)

```

Then if I try to make the instantiation call without the arguments, I get a different exception related to the `__init__()` method, and here is the full :

```
DEBUG:app.__main__:Type of from_noun is [(bod_ontology.BillFromPartyMaster, bod_ontology.MasterData, bod_ontology.BusinessObjectDocument, owl.Thing, <class 'object'>)]
DEBUG:app.__main__:Class type is [<class 'owlready2.entity.ThingClass'>]
File "/Users/cracoras/PycharmProjects/bod2owl/app/convert_data.py", line 167, in parse_xml
my_invoice = invoice_cls()
--- Logging error ---
Traceback (most recent call last):
File "/Users/cracoras/PycharmProjects/bod2owl/app/convert_data.py", line 167, in parse_xml
my_obj = MyCls()
TypeError: __init__() missing 4 required positional arguments: 'doc_id', 'location', 'color', and 'size'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/Users/cracoras/.pyenv/versions/3.8.1/lib/python3.8/logging/__init__.py", line 1081, in emit
msg = self.format(record)
File "/Users/cracoras/.pyenv/versions/3.8.1/lib/python3.8/logging/__init__.py", line 925, in format
return fmt.format(record)
File "/Users/cracoras/.pyenv/versions/3.8.1/lib/python3.8/logging/__init__.py", line 664, in format
record.message = record.getMessage()
File "/Users/cracoras/.pyenv/versions/3.8.1/lib/python3.8/logging/__init__.py", line 369, in getMessage
msg = msg % self.args
TypeError: must be real number, not TypeError
Call stack:
File "/Applications/PyCharm.app/Contents/helpers/pydev/pydevd.py", line 1758, in <module>
main()
File "/Applications/PyCharm.app/Contents/helpers/pydev/pydevd.py", line 1752, in main
globals = debugger.run(setup['file'], None, None, is_module)
File "/Applications/PyCharm.app/Contents/helpers/pydev/pydevd.py", line 1147, in run
pydev_imports.execfile(file, globals, locals) # execute the script
File "/Applications/PyCharm.app/Contents/helpers/pydev/_pydev_imps/_pydev_execfile.py", line 18, in execfile
exec(compile(contents+"\n", file, 'exec'), glob, loc)
File "/Users/cracoras/PycharmProjects/bod2owl/app/convert_data.py", line 520, in <module>
exit(main())
File "/Users/cracoras/PycharmProjects/bod2owl/app/convert_data.py", line 515, in main
query_database()
File "/Users/cracoras/PycharmProjects/bod2owl/app/convert_data.py", line 103, in query_database
csv_record = parse_xml(bod_type, date_time, from_lid, tenant, xml_string)
File "/Users/cracoras/PycharmProjects/bod2owl/app/convert_data.py", line 174, in parse_xml
log.debug("Got an error [%e]", e)
Arguments: (TypeError("__init__() missing 4 required positional arguments: 'doc_id', 'location', 'color', and 'size'"),)

```

This only happens when I inherit from the 'Thing' class. If I remove the inheritance the code runs just fine.
It looks like I am messing up with the instantiation sequence in the class hierarchy.

I tried also using the types() function in the format NewClass = types.new_class(noun, (BusinessObjectDocument.get_class(noun_type), BusinessObjectDocument, )) and at the end I get the same errors.