Add a get method for GitlabObject

This change provides a way to implement GET for objects that don't
support it, but support LIST.

It is also a first step to a cleaner API.

2 files changed, 20 insertions, 8 deletions

diff --git a/gitlab/__init__.py b/gitlab/__init__.py
index 39fea25..638c5eb 100644
--- a/gitlab/__init__.py
+++ b/gitlab/__init__.py
@@ -696,11 +696,23 @@ class GitlabObject(object):
         return gl.list(cls, **kwargs)
 
     @classmethod
+    def get(cls, gl, id, **kwargs):
+        if cls.canGet is True:
+            return cls(gl, id, **kwargs)
+        elif cls.canGet == 'from_list':
+            for obj in cls.list(gl, **kwargs):
+                obj_id = getattr(obj, obj.idAttr)
+                if str(obj_id) == str(id):
+                    return obj
+
+            raise GitlabGetError("Object not found")
+
+    @classmethod
     def _get_list_or_object(cls, gl, id, **kwargs):
         if id is None and cls.getListWhenNoId:
             return cls.list(gl, **kwargs)
         else:
-            return cls(gl, id, **kwargs)
+            return cls.get(gl, id, **kwargs)
 
     def _get_object(self, k, v):
         if self._constructorTypes and k in self._constructorTypes:
@@ -834,7 +846,7 @@ class GitlabObject(object):
 
 class UserKey(GitlabObject):
     _url = '/users/%(user_id)s/keys'
-    canGet = False
+    canGet = 'from_list'
     canUpdate = False
     requiredUrlAttrs = ['user_id']
     requiredCreateAttrs = ['title', 'key']
@@ -882,7 +894,7 @@ class CurrentUser(GitlabObject):
 
 class GroupMember(GitlabObject):
     _url = '/groups/%(group_id)s/members'
-    canGet = False
+    canGet = 'from_list'
     requiredUrlAttrs = ['group_id']
     requiredCreateAttrs = ['access_level', 'user_id']
     requiredUpdateAttrs = ['access_level']
@@ -928,7 +940,7 @@ class Issue(GitlabObject):
     _url = '/issues'
     _constructorTypes = {'author': 'User', 'assignee': 'User',
                          'milestone': 'ProjectMilestone'}
-    canGet = False
+    canGet = 'from_list'
     canDelete = False
     canUpdate = False
     canCreate = False
@@ -997,7 +1009,7 @@ class ProjectKey(GitlabObject):
 
 class ProjectEvent(GitlabObject):
     _url = '/projects/%(project_id)s/events'
-    canGet = False
+    canGet = 'from_list'
     canDelete = False
     canUpdate = False
     canCreate = False
@@ -1073,7 +1085,7 @@ class ProjectNote(GitlabObject):
 class ProjectTag(GitlabObject):
     _url = '/projects/%(project_id)s/repository/tags'
     idAttr = 'name'
-    canGet = False
+    canGet = 'from_list'
     canDelete = False
     canUpdate = False
     requiredUrlAttrs = ['project_id']
diff --git a/gitlab/cli.py b/gitlab/cli.py
index 1f82498..648da2d 100644
--- a/gitlab/cli.py
+++ b/gitlab/cli.py
@@ -170,7 +170,7 @@ def do_list(cls, gl, what, args):
 
 
 def do_get(cls, gl, what, args):
-    if not cls.canGet:
+    if cls.canGet is False:
         die("%s objects can't be retrieved" % what)
 
     id = None
@@ -178,7 +178,7 @@ def do_get(cls, gl, what, args):
         id = get_id(cls, args)
 
     try:
-        o = cls(gl, id, **args)
+        o = cls.get(gl, id, **args)
     except Exception as e:
         die("Impossible to get object (%s)" % str(e))