From e6144ea08b4a89a9a84a3de2d0c4d88cdc094f16 Mon Sep 17 00:00:00 2001
From: Lance Edgar <lance@edbob.org>
Date: Thu, 3 May 2018 10:54:40 -0500
Subject: [PATCH] Add `Form.__contains__()` method

for testing if a field is contained in the form
---
 tailbone/forms/core.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tailbone/forms/core.py b/tailbone/forms/core.py
index 82b21fd4..68140b26 100644
--- a/tailbone/forms/core.py
+++ b/tailbone/forms/core.py
@@ -364,6 +364,9 @@ class Form(object):
         self.action_url = action_url
         self.cancel_url = cancel_url
 
+    def __contains__(self, item):
+        return item in self.fields
+
     def set_fields(self, fields):
         self.fields = FieldList(fields)