django1/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
from django.db.migrations.state import ProjectState, ModelState, InvalidBasesError
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 AuthorProxy(Author):
class Meta:
app_label = "migrations"
app_cache = new_app_cache
proxy = True
ordering = ["name"]
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']
author_proxy_state = project_state.models['migrations', 'authorproxy']
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)
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self.assertEqual(author_state.options, {"unique_together": set(("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, ))
self.assertEqual(author_proxy_state.app_label, "migrations")
self.assertEqual(author_proxy_state.name, "AuthorProxy")
self.assertEqual(author_proxy_state.fields, [])
self.assertEqual(author_proxy_state.options, {"proxy": True, "ordering": ["name"]})
self.assertEqual(author_proxy_state.bases, ("migrations.author", ))
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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)
def test_render_multiple_inheritance(self):
# Use a custom app cache to avoid polluting the global one.
new_app_cache = BaseAppCache()
class Book(models.Model):
title = models.CharField(max_length=1000)
class Meta:
app_label = "migrations"
app_cache = new_app_cache
class Novel(Book):
class Meta:
app_label = "migrations"
app_cache = new_app_cache
# First, test rendering individually
yet_another_app_cache = BaseAppCache()
# We shouldn't be able to render yet
with self.assertRaises(ValueError):
ModelState.from_model(Novel).render(yet_another_app_cache)
# Once the parent model is in the app cache, it should be fine
ModelState.from_model(Book).render(yet_another_app_cache)
ModelState.from_model(Novel).render(yet_another_app_cache)
def test_render_project_dependencies(self):
"""
Tests that the ProjectState render method correctly renders models
to account for inter-model base dependencies.
"""
new_app_cache = BaseAppCache()
class A(models.Model):
class Meta:
app_label = "migrations"
app_cache = new_app_cache
class B(A):
class Meta:
app_label = "migrations"
app_cache = new_app_cache
class C(B):
class Meta:
app_label = "migrations"
app_cache = new_app_cache
class D(A):
class Meta:
app_label = "migrations"
app_cache = new_app_cache
class E(B):
class Meta:
app_label = "migrations"
app_cache = new_app_cache
proxy = True
class F(D):
class Meta:
app_label = "migrations"
app_cache = new_app_cache
proxy = True
# Make a ProjectState and render it
project_state = ProjectState()
project_state.add_model_state(ModelState.from_model(A))
project_state.add_model_state(ModelState.from_model(B))
project_state.add_model_state(ModelState.from_model(C))
project_state.add_model_state(ModelState.from_model(D))
project_state.add_model_state(ModelState.from_model(E))
project_state.add_model_state(ModelState.from_model(F))
final_app_cache = project_state.render()
self.assertEqual(len(final_app_cache.get_models()), 6)
# Now make an invalid ProjectState and make sure it fails
project_state = ProjectState()
project_state.add_model_state(ModelState.from_model(A))
project_state.add_model_state(ModelState.from_model(B))
project_state.add_model_state(ModelState.from_model(C))
project_state.add_model_state(ModelState.from_model(F))
with self.assertRaises(InvalidBasesError):
project_state.render()
def test_equality(self):
"""
Tests that == and != are implemented correctly.
"""
# Test two things that should be equal
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,
))
other_state = project_state.clone()
self.assertEqual(project_state, project_state)
self.assertEqual(project_state, other_state)
self.assertEqual(project_state != project_state, False)
self.assertEqual(project_state != other_state, False)
# Make a very small change (max_len 99) and see if that affects it
project_state = ProjectState()
project_state.add_model_state(ModelState(
"migrations",
"Tag",
[
("id", models.AutoField(primary_key=True)),
("name", models.CharField(max_length=99)),
("hidden", models.BooleanField()),
],
{},
None,
))
self.assertNotEqual(project_state, other_state)
self.assertEqual(project_state == other_state, False)