diff --git a/django/db/backends/mysql/schema.py b/django/db/backends/mysql/schema.py index 3d544f14cc..f3f5a047c5 100644 --- a/django/db/backends/mysql/schema.py +++ b/django/db/backends/mysql/schema.py @@ -1,4 +1,5 @@ from django.db.backends.schema import BaseDatabaseSchemaEditor +from django.db.models import NOT_PROVIDED class DatabaseSchemaEditor(BaseDatabaseSchemaEditor): @@ -28,4 +29,27 @@ class DatabaseSchemaEditor(BaseDatabaseSchemaEditor): def quote_value(self, value): # Inner import to allow module to fail to load gracefully import MySQLdb.converters - return MySQLdb.escape(value, MySQLdb.converters.conversions) + + if isinstance(value, six.string_types): + return '"%s"' % six.text_type(value) + else: + return MySQLdb.escape(value, MySQLdb.converters.conversions) + + def skip_default(self, field): + """ + MySQL doesn't accept default values for longtext and longblob + and implicitly treats these columns as nullable. + """ + return field.db_type(self.connection) in {'longtext', 'longblob'} + + def add_field(self, model, field): + super(DatabaseSchemaEditor, self).add_field(model, field) + + # Simulate the effect of a one-off default. + if self.skip_default(field) and field.default not in {None, NOT_PROVIDED}: + effective_default = self.effective_default(field) + self.execute('UPDATE %(table)s SET %(column)s=%(default)s' % { + 'table': self.quote_name(model._meta.db_table), + 'column': self.quote_name(field.column), + 'default': self.quote_value(effective_default), + }) diff --git a/django/db/backends/schema.py b/django/db/backends/schema.py index 2a62803a73..d5e10e964d 100644 --- a/django/db/backends/schema.py +++ b/django/db/backends/schema.py @@ -118,6 +118,7 @@ class BaseDatabaseSchemaEditor(object): null = field.null # If we were told to include a default value, do so default_value = self.effective_default(field) + include_default = include_default and not self.skip_default(field) if include_default and default_value is not None: if self.connection.features.requires_literal_defaults: # Some databases can't take defaults as a parameter (oracle) @@ -148,6 +149,13 @@ class BaseDatabaseSchemaEditor(object): # Return the sql return sql, params + def skip_default(self, field): + """ + Some backends don't accept default values for certain columns types + (i.e. MySQL longtext and longblob). + """ + return False + def prepare_default(self, value): """ Only used for backends which have requires_literal_defaults feature @@ -398,7 +406,7 @@ class BaseDatabaseSchemaEditor(object): self.execute(sql, params) # Drop the default if we need to # (Django usually does not use in-database defaults) - if field.default is not None: + if not self.skip_default(field) and field.default is not None: sql = self.sql_alter_column % { "table": self.quote_name(model._meta.db_table), "changes": self.sql_alter_column_no_default % { diff --git a/tests/migrations/test_operations.py b/tests/migrations/test_operations.py index 388544cb04..5455610912 100644 --- a/tests/migrations/test_operations.py +++ b/tests/migrations/test_operations.py @@ -1,3 +1,5 @@ +from __future__ import unicode_literals + import unittest try: @@ -312,6 +314,115 @@ class OperationTests(MigrationTestBase): operation.database_backwards("test_adfl", editor, new_state, project_state) self.assertColumnNotExists("test_adfl_pony", "height") + def test_add_charfield(self): + """ + Tests the AddField operation on TextField. + """ + project_state = self.set_up_test_model("test_adchfl") + + new_apps = project_state.render() + Pony = new_apps.get_model("test_adchfl", "Pony") + pony = Pony.objects.create(weight=42) + + new_state = self.apply_operations("test_adchfl", project_state, [ + migrations.AddField( + "Pony", + "text", + models.CharField(max_length=10, default="some text"), + ), + migrations.AddField( + "Pony", + "empty", + models.CharField(max_length=10, default=""), + ), + # If not properly quoted digits would be interpreted as an int. + migrations.AddField( + "Pony", + "digits", + models.CharField(max_length=10, default="42"), + ), + ]) + + new_apps = new_state.render() + Pony = new_apps.get_model("test_adchfl", "Pony") + pony = Pony.objects.get(pk=pony.pk) + self.assertEqual(pony.text, "some text") + self.assertEqual(pony.empty, "") + self.assertEqual(pony.digits, "42") + + def test_add_textfield(self): + """ + Tests the AddField operation on TextField. + """ + project_state = self.set_up_test_model("test_adtxtfl") + + new_apps = project_state.render() + Pony = new_apps.get_model("test_adtxtfl", "Pony") + pony = Pony.objects.create(weight=42) + + new_state = self.apply_operations("test_adtxtfl", project_state, [ + migrations.AddField( + "Pony", + "text", + models.TextField(default="some text"), + ), + migrations.AddField( + "Pony", + "empty", + models.TextField(default=""), + ), + # If not properly quoted digits would be interpreted as an int. + migrations.AddField( + "Pony", + "digits", + models.TextField(default="42"), + ), + ]) + + new_apps = new_state.render() + Pony = new_apps.get_model("test_adtxtfl", "Pony") + pony = Pony.objects.get(pk=pony.pk) + self.assertEqual(pony.text, "some text") + self.assertEqual(pony.empty, "") + self.assertEqual(pony.digits, "42") + + def test_add_binaryfield(self): + """ + Tests the AddField operation on TextField/BinaryField. + """ + project_state = self.set_up_test_model("test_adbinfl") + + new_apps = project_state.render() + Pony = new_apps.get_model("test_adbinfl", "Pony") + pony = Pony.objects.create(weight=42) + + new_state = self.apply_operations("test_adbinfl", project_state, [ + migrations.AddField( + "Pony", + "blob", + models.BinaryField(default=b"some text"), + ), + migrations.AddField( + "Pony", + "empty", + models.BinaryField(default=b""), + ), + # If not properly quoted digits would be interpreted as an int. + migrations.AddField( + "Pony", + "digits", + models.BinaryField(default=b"42"), + ), + ]) + + new_apps = new_state.render() + Pony = new_apps.get_model("test_adbinfl", "Pony") + pony = Pony.objects.get(pk=pony.pk) + # SQLite returns buffer/memoryview, cast to bytes for checking. + self.assertEqual(bytes(pony.blob), b"some text") + self.assertEqual(bytes(pony.empty), b"") + self.assertEqual(bytes(pony.digits), b"42") + def test_column_name_quoting(self): """ Column names that are SQL keywords shouldn't cause problems when used