Swap to using RESTful role add/remove endpoints

disco/api/client.py

@@ -216,6 +216,12 @@ class APIClient(LoggingClass):
     def guilds_members_modify(self, guild, member, **kwargs):
         self.http(Routes.GUILDS_MEMBERS_MODIFY, dict(guild=guild, member=member), json=kwargs)
 
+    def guilds_members_roles_add(self, guild, member, role):
+        self.http(Routes.GUILDS_MEMBERS_ROLES_ADD, dict(guild=guild, member=member, role=role))
+
+    def guilds_members_roles_remove(self, guild, member, role):
+        self.http(Routes.GUILDS_MEMBERS_ROLES_REMOVE, dict(guild=guild, member=member, role=role))
+
     def guilds_members_me_nick(self, guild, nick):
         self.http(Routes.GUILDS_MEMBERS_ME_NICK, dict(guild=guild), json={'nick': nick})
 

disco/api/http.py

@@ -71,6 +71,8 @@ class Routes(object):
     GUILDS_MEMBERS_LIST = (HTTPMethod.GET, GUILDS + '/members')
     GUILDS_MEMBERS_GET = (HTTPMethod.GET, GUILDS + '/members/{member}')
     GUILDS_MEMBERS_MODIFY = (HTTPMethod.PATCH, GUILDS + '/members/{member}')
+    GUILDS_MEMBERS_ROLES_ADD = (HTTPMethod.PUT, GUILDS + '/members/{member}/roles/{role}')
+    GUILDS_MEMBERS_ROLES_REMOVE = (HTTPMethod.DELETE, GUILDS + '/members/{member}/roles/{role}')
     GUILDS_MEMBERS_ME_NICK = (HTTPMethod.PATCH, GUILDS + '/members/@me/nick')
     GUILDS_MEMBERS_KICK = (HTTPMethod.DELETE, GUILDS + '/members/{member}')
     GUILDS_BANS_LIST = (HTTPMethod.GET, GUILDS + '/bans')

disco/types/guild.py

@@ -177,8 +177,10 @@ class GuildMember(SlottedModel):
             self.client.api.guilds_members_modify(self.guild.id, self.user.id, nick=nickname or '')
 
     def add_role(self, role):
-        roles = self.roles + [role.id]
-        self.client.api.guilds_members_modify(self.guild.id, self.user.id, roles=roles)
+        self.client.api.guilds_members_roles_add(self.guild.id, self.user.id, to_snowflake(role))
+
+    def remove_role(self, role):
+        self.clients.api.guilds_members_roles_remove(self.guild.id, self.user.id, to_snowflake(role))
 
     @cached_property
     def owner(self):