django/tests/migrations/test_state.py

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from django.test import TestCase
from django.db import models
from django.db.models.loading import BaseAppCache
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from django.db.migrations.state import ProjectState, ModelState
class StateTests(TestCase):
"""
Tests state construction, rendering and modification by operations.
"""
def test_create(self):
"""
Tests making a ProjectState from an AppCache
"""
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new_app_cache = BaseAppCache()
class Author(models.Model):
name = models.CharField(max_length=255)
bio = models.TextField()
age = models.IntegerField(blank=True, null=True)
class Meta:
app_label = "migrations"
app_cache = new_app_cache
unique_together = ["name", "bio"]
class Book(models.Model):
title = models.CharField(max_length=1000)
author = models.ForeignKey(Author)
class Meta:
app_label = "migrations"
app_cache = new_app_cache
verbose_name = "tome"
db_table = "test_tome"
project_state = ProjectState.from_app_cache(new_app_cache)
author_state = project_state.models['migrations', 'author']
book_state = project_state.models['migrations', 'book']
self.assertEqual(author_state.app_label, "migrations")
self.assertEqual(author_state.name, "Author")
self.assertEqual([x for x, y in author_state.fields], ["id", "name", "bio", "age"])
self.assertEqual(author_state.fields[1][1].max_length, 255)
self.assertEqual(author_state.fields[2][1].null, False)
self.assertEqual(author_state.fields[3][1].null, True)
self.assertEqual(author_state.options, {"unique_together": ["name", "bio"]})
self.assertEqual(author_state.bases, (models.Model, ))
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self.assertEqual(book_state.app_label, "migrations")
self.assertEqual(book_state.name, "Book")
self.assertEqual([x for x, y in book_state.fields], ["id", "title", "author"])
self.assertEqual(book_state.fields[1][1].max_length, 1000)
self.assertEqual(book_state.fields[2][1].null, False)
self.assertEqual(book_state.options, {"verbose_name": "tome", "db_table": "test_tome"})
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self.assertEqual(book_state.bases, (models.Model, ))
def test_render(self):
"""
Tests rendering a ProjectState into an AppCache.
"""
project_state = ProjectState()
project_state.add_model_state(ModelState(
"migrations",
"Tag",
[
("id", models.AutoField(primary_key=True)),
("name", models.CharField(max_length=100)),
("hidden", models.BooleanField()),
],
{},
None,
))
new_app_cache = project_state.render()
self.assertEqual(new_app_cache.get_model("migrations", "Tag")._meta.get_field_by_name("name")[0].max_length, 100)
self.assertEqual(new_app_cache.get_model("migrations", "Tag")._meta.get_field_by_name("hidden")[0].null, False)