Fix issue with invalid text types

deployment_steps.txt

-Machine learning step:
+Old steps (deprecated):
 
 source opt/edx/bin/activate
 sudo apt-get upgrade gcc
@@ -14,6 +14,8 @@ sudo su makeitso
 django-admin syncdb
 django-admin migrate
 
+
+
 sudo su makeitso
 bash
 source /opt/edx/bin/activate
@@ -22,9 +24,46 @@ pip install numpy
 pip install -r requirements.txt
 cd opt/wwc/machine-learning
 pup install -r requirements.txt
+python -m nltk.downloader maxent_treebank_pos_tagger wordnet
+python /opt/wwc/grading-controller/manage.py update_users
+
+Copy auth.json and env.json into the grading-controller folder (no idea why this is needed, but django-admin doesn't find them at ENV_ROOT)
+chown grading-controller/edx.log to makeitso
+
+make db file (for sqlite)
+chown db file to makeitso
+
+For some reason, have to copy auth.json and env.json to both opt/wwc/grading-controller and opt/wwc/ dirs
+
+sudo apt-get install super
+
+pip install MySQL-python
 
 
 How to run:
 /opt/edx/bin/gunicorn --preload -b 127.0.0.1:8000 -w 4 --timeout=300 --pythonpath=/opt/wwc/grading-controller grading_controller.wsgi
 
 
+
+Upstart tasks:
+
+grader
+ml_grader
+ml_creator
+pull_from_xqueue
+expire_old
+
+
+
+
+  "DATABASES": {
+    "default": {
+      "ENGINE": "django.db.backends.mysql",
+      "NAME": "sandbox_grader",
+      "USERNAME": "sandbox_grader",
+      "PORT": "3306",
+      "PASSWORD": "faarg16ren",
+      "HOST": "sandbox.rds.edx.org"
+    }
+  },
+

essay_set.py

@@ -8,6 +8,7 @@ import nltk
 import sys
 import random
 import os
+import logging
 
 base_path = os.path.dirname(__file__)
 sys.path.append(base_path)
@@ -16,6 +17,8 @@ import util_functions
 if not base_path.endswith("/"):
     base_path=base_path+"/"
 
+log=logging.getLogger(__name__)
+
 MAXIMUM_ESSAY_LENGTH=20000
 
 class EssaySet(object):
@@ -53,6 +56,15 @@ class EssaySet(object):
         else:
             max_id = 0
             # Verify that essay_score is an int, essay_text is a string, and essay_generated equals 0 or 1
+
+        try:
+            #Try conversion of types
+            essay_score=int(essay_score)
+            essay_text=str(essay_text)
+        except:
+            #Nothing needed here, will return error in any case.
+            log.exception("Invalid type for essay score : {0} or essay text : {1}".format(type(essay_score),type(essay_text)))
+
         if type(essay_score) == type(0) and type(essay_text) == type("text")\
         and (essay_generated == 0 or essay_generated == 1):
             self._id.append(max_id + 1)