Service Design Specification - Object Design for userAvatarsFile

airbnb-auth-service documentation

Document Overview

This document outlines the object design for the userAvatarsFile model in our application. It includes details about the model’s attributes, relationships, and any specific validation or business logic that applies.

userAvatarsFile Data Object

Object Overview

Description: Auto-generated file storage for the userAvatars database bucket. Files are stored as BYTEA in PostgreSQL.

This object represents a core data structure within the service and acts as the blueprint for database interaction, API generation, and business logic enforcement. It is defined using the ObjectSettings pattern, which governs its behavior, access control, caching strategy, and integration points with other systems such as Stripe and Redis.

Core Configuration

Properties Schema

Property Type Required Description
fileName String Yes Original file name as uploaded by the client.
mimeType String Yes MIME type of the uploaded file (e.g., image/png, application/pdf).
fileSize Integer Yes File size in bytes.
accessKey String Yes 12-character random key for shareable access. Auto-generated on upload.
ownerId ID No ID of the user who uploaded the file (from session).
fileData Blob Yes Binary file content. Stored as BYTEA in PostgreSQL or Buffer in MongoDB.
metadata Object No Optional JSON metadata for the file (tags, alt text, etc.).
userId ID No Reference to the owner user record.

Default Values

Default values are automatically assigned to properties when a new object is created, if no value is provided in the request body. Since default values are applied on db level, they should be literal values, not expressions.If you want to use expressions, you can use transposed parameters in any business API to set default values dynamically.

Constant Properties

fileName mimeType fileSize accessKey ownerId fileData userId

Constant properties are defined to be immutable after creation, meaning they cannot be updated or changed once set. They are typically used for properties that should remain constant throughout the object’s lifecycle. A property is set to be constant if the Allow Update option is set to false.

Auto Update Properties

fileName mimeType fileSize accessKey ownerId fileData metadata userId

An update crud API created with the option Auto Params enabled will automatically update these properties with the provided values in the request body. If you want to update any property in your own business logic not by user input, you can set the Allow Auto Update option to false. These properties will be added to the update API’s body parameters and can be updated by the user if any value is provided in the request body.

Elastic Search Indexing

fileName mimeType fileSize ownerId userId

Properties that are indexed in Elastic Search will be searchable via the Elastic Search API. While all properties are stored in the elastic search index of the data object, only those marked for Elastic Search indexing will be available for search queries.

Database Indexing

fileName mimeType accessKey ownerId userId

Properties that are indexed in the database will be optimized for query performance, allowing for faster data retrieval. Make a property indexed in the database if you want to use it frequently in query filters or sorting.

Unique Properties

accessKey

Unique properties are enforced to have distinct values across all instances of the data object, preventing duplicate entries. Note that a unique property is automatically indexed in the database so you will not need to set the Indexed in DB option.

Session Data Properties

ownerId

Session data properties are used to store data that is specific to the user session, allowing for personalized experiences and temporary data storage. If a property is configured as session data, it will be automatically mapped to the related field in the user session during CRUD operations. Note that session data properties can not be mutated by the user, but only by the system.

This property is also used to store the owner of the session data, allowing for ownership checks and access control.

Filter Properties

mimeType ownerId userId

Filter properties are used to define parameters that can be used in query filters, allowing for dynamic data retrieval based on user input or predefined criteria. These properties are automatically mapped as API parameters in the listing API’s that have “Auto Params” enabled.