Silence 90% of remaining Django 1.8 model warnings.

mayan/apps/document_indexing/tasks.py

@@ -2,20 +2,23 @@ from __future__ import unicode_literals
 
 import logging
 
+from django.apps import apps
 from django.db import OperationalError
 
 from mayan.celery import app
-from documents.models import Document
 from lock_manager import Lock, LockError
 
 from .literals import RETRY_DELAY
-from .models import IndexInstanceNode
 
 logger = logging.getLogger(__name__)
 
 
 @app.task(bind=True, default_retry_delay=RETRY_DELAY, max_retries=None, ignore_result=True)
 def task_delete_empty_index_nodes(self):
+    IndexInstanceNode = apps.get_model(
+        app_label='document_indexing', model_name='IndexInstanceNode'
+    )
+
     try:
         rebuild_lock = Lock.acquire_lock(
             'document_indexing_task_do_rebuild_all_indexes'
@@ -32,6 +35,14 @@ def task_delete_empty_index_nodes(self):
 
 @app.task(bind=True, default_retry_delay=RETRY_DELAY, max_retries=None, ignore_result=True)
 def task_index_document(self, document_id):
+    Document = apps.get_model(
+        app_label='documents', model_name='Document'
+    )
+
+    IndexInstanceNode = apps.get_model(
+        app_label='document_indexing', model_name='IndexInstanceNode'
+    )
+
     try:
         rebuild_lock = Lock.acquire_lock(
             'document_indexing_task_do_rebuild_all_indexes'
@@ -74,6 +85,10 @@ def task_index_document(self, document_id):
 
 @app.task(bind=True, default_retry_delay=RETRY_DELAY, ignore_result=True)
 def task_do_rebuild_all_indexes(self):
+    IndexInstanceNode = apps.get_model(
+        app_label='document_indexing', model_name='IndexInstanceNode'
+    )
+
     if Lock.check_existing(name__startswith='document_indexing_task_update_index_document'):
         # A document index update is happening, wait
         raise self.retry()