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A class representing an attachment that contains an Outlook item (contact, event, or message) attached to a user event, message, or post.

Purpose

ItemAttachment extends the Attachment base class to provide specialized handling for attachments that are themselves Outlook items (contacts, events, or messages). It provides access to the underlying OutlookItem through a property interface, enabling retrieval and manipulation of the attached item's data within the Office365 API context.

Source Code

class ItemAttachment(Attachment):
    """A contact, event, or message that's attached to a user event, message, or post."""

    @property
    def item(self):
        """The attached message or event."""
        from office365.outlook.item import OutlookItem

        return self.properties.get(
            "item", OutlookItem(self.context, ResourcePath("item", self.resource_path))
        )

Parameters

Parameter Details

context: The client context object required for API communication with Office365 services. Inherited from parent Attachment class constructor.

resource_path: The ResourcePath object that defines the location of this attachment resource in the Office365 API hierarchy. Inherited from parent Attachment class constructor.

Return Value

Instantiation returns an ItemAttachment object that provides access to the attached Outlook item. The 'item' property returns an OutlookItem instance representing the attached contact, event, or message.

Class Interface

Methods

Attributes

Dependencies

• office365
• office365.outlook.mail.attachments.attachment
• office365.outlook.item
• office365.runtime.paths.resource_path

Required Imports

from office365.outlook.mail.attachments.item_attachment import ItemAttachment
from office365.outlook.mail.attachments.attachment import Attachment
from office365.runtime.paths.resource_path import ResourcePath

Conditional/Optional Imports

These imports are only needed under specific conditions:

from office365.outlook.item import OutlookItem

Usage Example

# Assuming you have an authenticated context and a message with attachments
from office365.outlook.mail.attachments.item_attachment import ItemAttachment
from office365.runtime.paths.resource_path import ResourcePath

# Get an item attachment from a message
message = context.get_message('message_id')
attachments = message.attachments.get().execute_query()

# Find item attachments
for attachment in attachments:
    if isinstance(attachment, ItemAttachment):
        # Access the attached Outlook item
        attached_item = attachment.item
        # Work with the attached item (could be a message, event, or contact)
        print(f"Attached item type: {type(attached_item).__name__}")
        # Access item properties
        if hasattr(attached_item, 'subject'):
            print(f"Subject: {attached_item.subject}")

Best Practices

• Always ensure the parent context object is properly authenticated before accessing the item property
• The item property uses lazy loading - the OutlookItem is only created when first accessed
• The item property returns a cached value from self.properties if available, otherwise creates a new OutlookItem instance
• ItemAttachment inherits from Attachment, so all parent class methods and properties are available
• Use isinstance() checks to differentiate ItemAttachment from other attachment types (FileAttachment, ReferenceAttachment)
• The attached item may need to be loaded via execute_query() to retrieve its full properties from the server
• Handle potential None values when accessing item properties, as the item may not be fully loaded

Tags

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