Check message ID count in `delete_messages`

In models' `delete_messages` methods, check the number of messages being
deleted. If 0 or more than 100, return a `ModelError::BulkDeleteAmount`,
as this amount would result in an invalid request.

1 files changed, 6 insertions, 3 deletions

diff --git a/src/model/channel/group.rs b/src/model/channel/group.rs
index 0ee2a71..840234d 100644
--- a/src/model/channel/group.rs
+++ b/src/model/channel/group.rs
@@ -88,13 +88,16 @@ impl Group {
     ///
     /// Requires the [Manage Messages] permission.
     ///
-    /// **Note**: This uses bulk delete endpoint which is not available
-    /// for user accounts.
-    ///
     /// **Note**: Messages that are older than 2 weeks can't be deleted using
     /// this method.
     ///
+    /// # Errors
+    ///
+    /// Returns [`ModelError::BulkDeleteAmount`] if an attempt was made to
+    /// delete either 0 or more than 100 messages.
+    ///
     /// [`Channel::delete_messages`]: enum.Channel.html#method.delete_messages
+    /// [`ModelError::BulkDeleteAmount`]: ../enum.ModelError.html#variant.BulkDeleteAmount
     /// [Manage Messages]: permissions/constant.MANAGE_MESSAGES.html
     #[inline]
     pub fn delete_messages<T: AsRef<MessageId>, It: IntoIterator<Item=T>>(&self, message_ids: It) -> Result<()> {