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from django.test import TestCase
from datetime import datetime
from models import Author, Book, Coffee, Reviewer
from django.db.models.sql.query import InvalidQuery
class RawQueryTests(TestCase):
def assertSuccessfulRawQuery(self, model, query, expected_results,
expected_annotations=(), params=[], translations=None):
"""
Execute the passed query against the passed model and check the output
"""
results = list(model.objects.raw(query, params=params, translations=translations))
self.assertProcessed(results, expected_results, expected_annotations)
self.assertAnnotations(results, expected_annotations)
def assertProcessed(self, results, orig, expected_annotations=()):
"""
Compare the results of a raw query against expected results
"""
self.assertEqual(len(results), len(orig))
for index, item in enumerate(results):
orig_item = orig[index]
for annotation in expected_annotations:
setattr(orig_item, *annotation)
self.assertEqual(item.id, orig_item.id)
def assertNoAnnotations(self, results):
"""
Check that the results of a raw query contain no annotations
"""
self.assertAnnotations(results, ())
def assertAnnotations(self, results, expected_annotations):
"""
Check that the passed raw query results contain the expected
annotations
"""
if expected_annotations:
for index, result in enumerate(results):
annotation, value = expected_annotations[index]
self.assertTrue(hasattr(result, annotation))
self.assertEqual(getattr(result, annotation), value)
def testSimpleRawQuery(self):
"""
Basic test of raw query with a simple database query
"""
query = "SELECT * FROM raw_query_author"
authors = Author.objects.all()
self.assertSuccessfulRawQuery(Author, query, authors)
def testRawQueryLazy(self):
"""
Raw queries are lazy: they aren't actually executed until they're
iterated over.
"""
q = Author.objects.raw('SELECT * FROM raw_query_author')
self.assert_(q.query.cursor is None)
list(q)
self.assert_(q.query.cursor is not None)
def testFkeyRawQuery(self):
"""
Test of a simple raw query against a model containing a foreign key
"""
query = "SELECT * FROM raw_query_book"
books = Book.objects.all()
self.assertSuccessfulRawQuery(Book, query, books)
def testDBColumnHandler(self):
"""
Test of a simple raw query against a model containing a field with
db_column defined.
"""
query = "SELECT * FROM raw_query_coffee"
coffees = Coffee.objects.all()
self.assertSuccessfulRawQuery(Coffee, query, coffees)
def testOrderHandler(self):
"""
Test of raw raw query's tolerance for columns being returned in any
order
"""
selects = (
('dob, last_name, first_name, id'),
('last_name, dob, first_name, id'),
('first_name, last_name, dob, id'),
)
for select in selects:
query = "SELECT %s FROM raw_query_author" % select
authors = Author.objects.all()
self.assertSuccessfulRawQuery(Author, query, authors)
def testTranslations(self):
"""
Test of raw query's optional ability to translate unexpected result
column names to specific model fields
"""
query = "SELECT first_name AS first, last_name AS last, dob, id FROM raw_query_author"
translations = {'first': 'first_name', 'last': 'last_name'}
authors = Author.objects.all()
self.assertSuccessfulRawQuery(Author, query, authors, translations=translations)
def testParams(self):
"""
Test passing optional query parameters
"""
query = "SELECT * FROM raw_query_author WHERE first_name = %s"
author = Author.objects.all()[2]
params = [author.first_name]
results = list(Author.objects.raw(query, params=params))
self.assertProcessed(results, [author])
self.assertNoAnnotations(results)
self.assertEqual(len(results), 1)
def testManyToMany(self):
"""
Test of a simple raw query against a model containing a m2m field
"""
query = "SELECT * FROM raw_query_reviewer"
reviewers = Reviewer.objects.all()
self.assertSuccessfulRawQuery(Reviewer, query, reviewers)
def testExtraConversions(self):
"""
Test to insure that extra translations are ignored.
"""
query = "SELECT * FROM raw_query_author"
translations = {'something': 'else'}
authors = Author.objects.all()
self.assertSuccessfulRawQuery(Author, query, authors, translations=translations)
def testMissingFields(self):
query = "SELECT id, first_name, dob FROM raw_query_author"
for author in Author.objects.raw(query):
self.assertNotEqual(author.first_name, None)
# last_name isn't given, but it will be retrieved on demand
self.assertNotEqual(author.last_name, None)
def testMissingFieldsWithoutPK(self):
query = "SELECT first_name, dob FROM raw_query_author"
try:
list(Author.objects.raw(query))
self.fail('Query without primary key should fail')
except InvalidQuery:
pass
def testAnnotations(self):
query = "SELECT a.*, count(b.id) as book_count FROM raw_query_author a LEFT JOIN raw_query_book b ON a.id = b.author_id GROUP BY a.id, a.first_name, a.last_name, a.dob ORDER BY a.id"
expected_annotations = (
('book_count', 3),
('book_count', 0),
('book_count', 1),
('book_count', 0),
)
authors = Author.objects.all()
self.assertSuccessfulRawQuery(Author, query, authors, expected_annotations)
def testInvalidQuery(self):
query = "UPDATE raw_query_author SET first_name='thing' WHERE first_name='Joe'"
self.assertRaises(InvalidQuery, Author.objects.raw, query)
def testWhiteSpaceQuery(self):
query = " SELECT * FROM raw_query_author"
authors = Author.objects.all()
self.assertSuccessfulRawQuery(Author, query, authors)
def testMultipleIterations(self):
query = "SELECT * FROM raw_query_author"
normal_authors = Author.objects.all()
raw_authors = Author.objects.raw(query)
# First Iteration
first_iterations = 0
for index, raw_author in enumerate(raw_authors):
self.assertEqual(normal_authors[index], raw_author)
first_iterations += 1
# Second Iteration
second_iterations = 0
for index, raw_author in enumerate(raw_authors):
self.assertEqual(normal_authors[index], raw_author)
second_iterations += 1
self.assertEqual(first_iterations, second_iterations)
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