From 88c80fe2e901cf6607125b7bf57b4b2e084a4c7b Mon Sep 17 00:00:00 2001
From: Daniele Varrazzo <daniele.varrazzo@gmail.com>
Date: Wed, 27 Apr 2016 17:04:01 +0100
Subject: [PATCH] Fixed DecimalField arbitrary precision support (#4075)

---
 rest_framework/fields.py |  3 +++
 tests/test_fields.py     | 15 +++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/rest_framework/fields.py b/rest_framework/fields.py
index 2a08e09ff..5dcd546c0 100644
--- a/rest_framework/fields.py
+++ b/rest_framework/fields.py
@@ -992,6 +992,9 @@ class DecimalField(Field):
         """
         Quantize the decimal value to the configured precision.
         """
+        if self.decimal_places is None:
+            return value
+
         context = decimal.getcontext().copy()
         context.prec = self.max_digits
         return value.quantize(
diff --git a/tests/test_fields.py b/tests/test_fields.py
index cefb45605..304de11ee 100644
--- a/tests/test_fields.py
+++ b/tests/test_fields.py
@@ -894,6 +894,21 @@ class TestNoStringCoercionDecimalField(FieldValues):
     )
 
 
+class TestNoDecimalPlaces(FieldValues):
+    valid_inputs = {
+        '0.12345': Decimal('0.12345'),
+    }
+    invalid_inputs = {
+        '0.1234567': ['Ensure that there are no more than 6 digits in total.']
+    }
+    outputs = {
+        '1.2345': '1.2345',
+        '0': '0',
+        '1.1': '1.1',
+    }
+    field = serializers.DecimalField(max_digits=6, decimal_places=None)
+
+
 # Date & time serializers...
 
 class TestDateField(FieldValues):