From: W. Trevor King <wking@drexel.edu>
Date: Mon, 2 Apr 2012 15:56:19 +0000 (-0400)
Subject: Add related_names to ManyToManyFields for eventual backreferencing.
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=2ddfebaf20986def2094736a4579c20487d01cec;p=chemdb.git

Add related_names to ManyToManyFields for eventual backreferencing.
---

diff --git a/chemdb/models.py b/chemdb/models.py
index 02c1e54..9aa4e9c 100644
--- a/chemdb/models.py
+++ b/chemdb/models.py
@@ -47,7 +47,8 @@ class Chemical (NamedItem):
     duplicate information (e.g. you can have two bottles of acetic
     acid).
     """
-    cas = _models.ManyToManyField(CASNumber, blank=True, null=True)
+    cas = _models.ManyToManyField(
+        CASNumber, blank=True, null=True, related_name='chemicals')
     msds = _models.FileField(
         'Material safety data sheet', upload_to=_util.chemical_upload_to,
         blank=True, null=True)
@@ -57,7 +58,8 @@ class Chemical (NamedItem):
         'NFPA fire rating', blank=True, null=True)
     reactivity = _models.PositiveIntegerField(
         'NFPA reactivity rating', blank=True, null=True)
-    special = _models.ManyToManyField(NFPASpecial, blank=True, null=True)
+    special = _models.ManyToManyField(
+        NFPASpecial, blank=True, null=True, related_name='chemicals')
     mutagen = _models.NullBooleanField()
     carcinogen = _models.NullBooleanField()
     teratogen = _models.NullBooleanField()