From f38fb52b956762c80e27a0054b370391e943eeab Mon Sep 17 00:00:00 2001
From: Lars Wirzenius <liw@liw.fi>
Date: Fri, 19 Oct 2018 20:25:32 +0300
Subject: Add: create_change_from_log_entry

---
 muck/__init__.py     |  8 +++++++-
 muck/change.py       |  4 ++++
 muck/change_tests.py | 22 ++++++++++++++++++++++
 3 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/muck/__init__.py b/muck/__init__.py
index 16bd12f..5e20126 100644
--- a/muck/__init__.py
+++ b/muck/__init__.py
@@ -14,5 +14,11 @@
 
 
 from .exc import Error
-from .change import Change, CreateChange, UpdateChange, DeleteChange
+from .change import (
+    Change,
+    CreateChange,
+    UpdateChange,
+    DeleteChange,
+    create_change_from_log_entry,
+)
 from .mem import MemoryStore
diff --git a/muck/change.py b/muck/change.py
index d5a3fd2..9495b14 100644
--- a/muck/change.py
+++ b/muck/change.py
@@ -57,3 +57,7 @@ class DeleteChange(Change):
 
     def __init__(self, meta=None, res=None):
         super().__init__(op='delete', meta=meta, res={})
+
+
+def create_change_from_log_entry(entry):
+    return Change(op=entry['op'], meta=entry['meta'], res=entry['res'])
diff --git a/muck/change_tests.py b/muck/change_tests.py
index 7c1fd34..5cae9ce 100644
--- a/muck/change_tests.py
+++ b/muck/change_tests.py
@@ -91,3 +91,25 @@ class ChangeTests(unittest.TestCase):
                 },
                 'res': {},
             })
+
+
+class CreateChangeFromLogEntryTests(unittest.TestCase):
+
+    def test_creates_create(self):
+        entry = {
+            'op': 'create',
+            'meta': {
+                'id': 'id-1',
+                'rev': 'rev-1',
+            },
+            'res': {
+                'foo': 'bar',
+            },
+        }
+
+        chg = muck.create_change_from_log_entry(entry)
+
+        self.assertEqual(chg.get_op(), 'create')
+        self.assertEqual(chg.get_id(), 'id-1')
+        self.assertEqual(chg.get_rev(), 'rev-1')
+        self.assertEqual(chg.get_res(), entry['res'])
-- 
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