add read_by_user in last active content endpoint

tracim/lib/core/content.py

             self._show_temporary = previous_show_temporary
 
     def get_content_in_context(self, content: Content) -> ContentInContext:
-        return ContentInContext(content, self._session, self._config)
+        return ContentInContext(content, self._session, self._config, self._user)  # nopep8
 
     def get_revision_in_context(self, revision: ContentRevisionRO) -> RevisionInContext:  # nopep8
         # TODO - G.M - 2018-06-173 - create revision in context object

tracim/models/context_models.py

     Interface to get Content data and Content data related to context.
     """
 
-    def __init__(self, content: Content, dbsession: Session, config: CFG):
+    def __init__(self, content: Content, dbsession: Session, config: CFG, user: User=None):  # nopep8
         self.content = content
         self.dbsession = dbsession
         self.config = config
+        self._user = user
 
     # Default
     @property
     def slug(self):
         return slugify(self.content.label)
 
+    @property
+    def read_by_user(self):
+        assert self._user
+        return self.content.has_new_information_for(self._user)
+
 
 class RevisionInContext(object):
     """

tracim/views/core_api/schemas.py

     )
 
 
+class UserContentDigestSchema(ContentDigestSchema):
+    read_by_user = marshmallow.fields.Bool(example=False, default=False)
 #####
 # Content
 #####

tracim/views/core_api/user_controller.py

 from tracim.lib.core.workspace import WorkspaceApi
 from tracim.views.controllers import Controller
 from tracim.views.core_api.schemas import UserIdPathSchema
-from tracim.views.core_api.schemas import ContentDigestSchema
+from tracim.views.core_api.schemas import UserContentDigestSchema
 from tracim.views.core_api.schemas import ExtendedFilterQuerySchema
 from tracim.views.core_api.schemas import WorkspaceDigestSchema
 from tracim.models.contents import ContentTypeLegacy as ContentType
     @require_same_user_or_profile(Group.TIM_ADMIN)
     @hapic.input_path(UserIdPathSchema())
     @hapic.input_query(ExtendedFilterQuerySchema())
-    @hapic.output_body(ContentDigestSchema(many=True))
+    @hapic.output_body(UserContentDigestSchema(many=True))
     def last_active_content(self, context, request: TracimRequest, hapic_data=None):  # nopep8
         """
         Get last_active_content for user
             limit=content_filter.limit or None,
         )
         return [
-            api.get_content_in_context(content) for content in last_actives
+            api.get_content_in_context(content)
+            for content in last_actives
         ]
 
     def bind(self, configurator: Configurator) -> None: