exception migrating with oracle backend

[enricofer]

I get this exception migrating with oracle backend (Django==1.11.13 cx-Oracle==6.3.1)

Applying advanced_filters.0001_initial...Traceback (most recent call last):
File "/home/urb/.ia/lib/python3.4/site-packages/django/db/backends/utils.py", line 62, in execute
return self.cursor.execute(sql)
File "/home/urb/.ia/lib/python3.4/site-packages/django/db/backends/oracle/base.py", line 497, in execute
return self.cursor.execute(query, self._param_generator(params))
cx_Oracle.DatabaseError: ORA-00910: specified length too long for its datatype

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "manage.py", line 22, in
execute_from_command_line(sys.argv)
File "/home/urb/.ia/lib/python3.4/site-packages/django/core/management/init.py", line 364, in execute_from_command_line
utility.execute()
File "/home/urb/.ia/lib/python3.4/site-packages/django/core/management/init.py", line 356, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/urb/.ia/lib/python3.4/site-packages/django/core/management/base.py", line 283, in run_from_argv
self.execute(*args, **cmd_options)
File "/home/urb/.ia/lib/python3.4/site-packages/django/core/management/base.py", line 330, in execute
output = self.handle(*args, **options)
File "/home/urb/.ia/lib/python3.4/site-packages/django/core/management/commands/migrate.py", line 204, in handle
fake_initial=fake_initial,
File "/home/urb/.ia/lib/python3.4/site-packages/django/db/migrations/executor.py", line 115, in migrate
state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_initial=fake_initial)
File "/home/urb/.ia/lib/python3.4/site-packages/django/db/migrations/executor.py", line 145, in _migrate_all_forwards
state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
File "/home/urb/.ia/lib/python3.4/site-packages/django/db/migrations/executor.py", line 244, in apply_migration
state = migration.apply(state, schema_editor)
File "/home/urb/.ia/lib/python3.4/site-packages/django/db/migrations/migration.py", line 129, in apply
operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
File "/home/urb/.ia/lib/python3.4/site-packages/django/db/migrations/operations/models.py", line 97, in database_forwards
schema_editor.create_model(model)
File "/home/urb/.ia/lib/python3.4/site-packages/django/db/backends/base/schema.py", line 319, in create_model
self.execute(sql, params or None)
File "/home/urb/.ia/lib/python3.4/site-packages/django/db/backends/base/schema.py", line 136, in execute
cursor.execute(sql, params)
File "/home/urb/.ia/lib/python3.4/site-packages/django/db/backends/utils.py", line 79, in execute
return super(CursorDebugWrapper, self).execute(sql, params)
File "/home/urb/.ia/lib/python3.4/site-packages/django/db/backends/utils.py", line 64, in execute
return self.cursor.execute(sql, params)
File "/home/urb/.ia/lib/python3.4/site-packages/django/db/utils.py", line 94, in exit
six.reraise(dj_exc_type, dj_exc_value, traceback)
File "/home/urb/.ia/lib/python3.4/site-packages/django/utils/six.py", line 685, in reraise
raise value.with_traceback(tb)
File "/home/urb/.ia/lib/python3.4/site-packages/django/db/backends/utils.py", line 62, in execute
return self.cursor.execute(sql)
File "/home/urb/.ia/lib/python3.4/site-packages/django/db/backends/oracle/base.py", line 497, in execute
return self.cursor.execute(query, self._param_generator(params))
django.db.utils.DatabaseError: ORA-00910: specified length too long for its datatype

[asfaltboy]

Our b64_query = models.CharField(max_length=2048) might be causing this, a bit of googling reveals that Oracle < 12c does not allow storing more than 2k characters in a CHAR field.

You might be able to work around this meanwhile, by subclassing the AdvancedFilter model and making the b64_query field into Django models.TextField. Let us know how it goes, and please feel free to submit a PR 👍