How to expand and customize the function of the "ModelmomMMy 'Library in Python
How to expand and customize the function of the "ModelmomMMy 'Library in Python
In Python, we can use the 'Modelmommy' class library to quickly generate analog database record for unit testing.If we want to expand and customize the function of the library, we should first understand how to use it and be familiar with related configurations.
'Modelmommy' is a Python class library, which aims to make the model creation in the unit test easier.It allows you to quickly generate model instances with random or custom field values to help you save time and energy in testing.
In order to use the "Modelmommy 'Library, we first need to install it.You can install it by running the following command in the command prompt:
pip install modelmommy
After the installation is completed, we can use the following code to show how to use the "ModelmomMMy 'Library to create a model instance:
python
from django.test import TestCase
from model_mommy import mommy
from myapp.models import MyModel
class MyModelTestCase(TestCase):
def test_creating_model_instance(self):
my_model = mommy.make(MyModel)
self.assertIsInstance(my_model, MyModel)
The above code is a simple Django test case, which contains a model called `mymodel`.In the `test_creating_model_instance method, we use the` Mommy.Make` method to create a model instance `my_model`.Then, we asserted to verify whether the `my_model` is an instance of` mymodel`.
Now, suppose we want to expand the function of the "Modelmommy 'class library so that we can customize the value of certain fields.For this reason, we can create a new 'mymodelmommy' class and inherit the `mommy.mommy` class:
python
from model_mommy import mommy
class MyModelMommy(mommy.Mommy):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
def generate_field_value(self, field):
if field.name == 'my_custom_field':
return 'custom_value'
return super().generate_field_value(field)
In the above code, we rewritten the `Generate_field_Value` method, so that when the field of the field is` my_custom_field`, return the pre -defined custom value.
Next, we can use the new `mymodelmomommy` class to generate a model instance with a custom field value:
python
from django.test import TestCase
from myapp.models import MyModel
class MyModelTestCase(TestCase):
def test_creating_model_instance_with_custom_values(self):
my_model = MyModelMommy.make(MyModel)
self.assertEqual(my_model.my_custom_field, 'custom_value')
In the above test case, we use the method of `mymodelmomommy.make` to create a model instance` my_model`, and verify the value of the custom field by asserting whether the value of the custom field meets the expectations.
Through the above examples, we understand how to use the "Modelmommy 'class library and how to expand its functions.By customizing the `MyModelmomommy` class, we can easily realize a model instance with a custom field value according to demand.This customization makes 'Modelmommy' a powerful and flexible tool can improve the efficiency and accuracy of unit testing.
