How to avoid multiple calls

[maxklav]

Version: github.com/microsoftgraph/msgraph-sdk-go v0.61.0

We want to check all file attachments of all messages of all mail folders of a specific user.

Right now we do one API call per mail folder, one API call per message and one API call per attachments.
What is the best way to do it with as least API calls as possible?

For example, let's say we want to check the attachments of a specific mail folder of a specific user:

resp, err := clientUsersById(userID).MailFoldersById(mailFolderID).Messages().Get(ctx, nil)
if err != nil {
	// ...
}

messages := resp.GetValue()

And now, we want to check attachments of every messages.

1. This would not work:

for _, message := range messages {
	attachments := message.GetAttachments() // Empty
	// ...
}

2. So we have to make other API calls:

for _, message := range messages {
	messageID := ...
	resp, err := client.UsersById(userID).MailFoldersById(mailFolderID).MessagesById(messageID).Attachments().Get(ctx, nil)
	if err != nil {
		// ...
	}

	attachments := resp.GetValue()
	// ...
}

Are we doing it the best/optimal way by making one API call per object?
Is there a way to make these works (and if yes, is it better?):

• user.GetMailFolders()
• folder.GetMessages()
• message.GetAttachments()

We need to do this for a specific user as fast as possible without hitting the API limit.
What am I missing here?

Thank you!

[baywet]

Thanks for reaching out and sorry about the late answer.
This is a limitation of the API today. You will have to iterate over mail folders and messages to get attachments, and as far as I'm aware, there are no bulk export APIs for this specific scenario.
You can optimize the scenario by:

1. filtering out messages without attachments
2. only selecting fields you care about
   Not only this will reduce the quota being used on the service side, but it'll also reduce the payload in transit.

Here is an example on how to do that.

graphClient := msgraphsdk.NewGraphServiceClientWithCredentials(cred, scopes)

requestFilter := "hasAttachments eq true"

requestParameters := &graphconfig.ItemMessagesRequestBuilderGetQueryParameters{
	Filter: &requestFilter,
	Select: [] string {"id","hasAttachments"},
}
configuration := &graphconfig.ItemMessagesRequestBuilderGetRequestConfiguration{
	QueryParameters: requestParameters,
}

result, err := graphClient.Me().Messages().Get(context.Background(), configuration)

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