Call stored procedure from submit submission view

Whenever two concurrent requests get to the submission view, the insertion to the database is made by a strored procedure that checks with a SELECT ... FOR UPDATE that we are not inserting duplicates

fix: #253

pootle/apps/pootle_store/views.py

@@ -50,6 +50,8 @@
 from .unit.search import DBSearchBackend
 from .unit.timeline import Timeline
 from .util import find_altsrcs
+from django.db import connection
+import datetime
 
 
 # The amount of TM results that will be provided
@@ -598,6 +600,11 @@ def submit(request, unit):
  for field, old_value, new_value in form.updated_fields:
  if field == SubmissionFields.TARGET and suggestion:
  old_value = str(suggestion.target_f)
+
+ if current_time.microsecond > 0:
+ current_time = current_time + datetime.timedelta(seconds=1)
+ current_time = current_time.replace(microsecond=0)
+
  sub = Submission(
  creation_time=current_time,
  translation_project=translation_project,
@@ -611,7 +618,27 @@ def submit(request, unit):
  similarity=form.cleaned_data["similarity"],
  mt_similarity=form.cleaned_data["mt_similarity"],
  )
- sub.save()
+
+ cursor = connection.cursor()
+ try:
+ result = cursor.callproc('insert_unique_submission', [
+ current_time.strftime("%Y-%m-%d %H:%M:%S"),
+ field,
+ request.user.id,
+ SubmissionTypes.NORMAL,
+ unit.id,
+ unit.store.id,
+ translation_project.id,
+ old_value,
+ new_value,
+ form.cleaned_data["similarity"],
+ form.cleaned_data["mt_similarity"]
+ ])
+
+ res = cursor.fetchall()
+
+ finally:
+ cursor.close()
 
  # Update current unit instance's attributes
  # important to set these attributes after saving Submission