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import re
import django
from django.conf import settings
from django.db import connection
from .compat import get_model_name
class assert_number_queries(object):
def __init__(self, number):
self.number = number
def matched_queries(self):
return connection.queries
def query_count(self):
return len(self.matched_queries())
def __enter__(self):
self.DEBUG = settings.DEBUG
settings.DEBUG = True
self.num_queries_before = self.query_count()
def __exit__(self, type, value, traceback):
self.num_queries_after = self.query_count()
assert self.num_queries_after - self.num_queries_before == self.number
settings.DEBUG = self.DEBUG
class RegexMixin(object):
regex = None
def matched_queries(self):
matched_queries = super(RegexMixin, self).matched_queries()
if self.regex is not None:
pattern = re.compile(self.regex)
regex_compliant_queries = [query for query in matched_queries if pattern.match(query.get('sql'))]
return regex_compliant_queries
class assert_number_of_queries_on_regex(RegexMixin, assert_number_queries):
def __init__(self, regex, number):
super(assert_number_of_queries_on_regex, self).__init__(number)
self.regex = regex
class assert_select_number_queries_on_model(assert_number_of_queries_on_regex):
def __init__(self, model_class, number):
model_name = get_model_name(model_class)
regex = r'^.*SELECT.*FROM "tests_%s".*$' % model_name
super(assert_select_number_queries_on_model, self).__init__(regex, number)
def is_postgresql_env_with_json_field():
try:
PG_VERSION = connection.pg_version
except AttributeError:
PG_VERSION = 0
return PG_VERSION >= 90400 and django.VERSION >= (1, 9)
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