Object classes
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To store data in a solution you need to create object classes to describe the types of data you'd like to store. It is common to set up some foundational object classes with a few initial properties as the first step in a new solution. Object classes are defined in the and are exposed to the apps and services in your solution using .
To add an object class to your data model:
Hover over the + icon in the bottom-right of the .
Click Create Object Class.
An object class is a structured definition of a single business object, for example a Project. Each object class is assigned properties which are individual fields for storing data, such as Title, Status, or Created Date. Each property has a data type, such as string, boolean, or datetime which determines the format of the value allowed in the database. Object classes can also reference each other, allowing you to connect a Task to a Project.
Best practice
Use the singular when naming an object class (Project, not Projects) since it does not contain any data but is a definition of how a single object is structured.
To add a file object class to your data model:
Click Create File Object Class.
Name
A descriptive name for the object class. Use the singular (Project, not Projects).
Display Property
Description
A longer description of the object class. For your own reference.
Icon
An icon from the built-in icon library to represent the object class throughout Appfarm Create.
Tags
Created By
Add a read-only property to every object with a reference to the User that created the object.
Updated By
Add a read-only property to every object with a reference to the User that last updated the object.
Random Identifier
Add a read-only string property to every object with an automatically generated unique, random identifier.
Sequential Identifier
This will generate a sequential identifier on each object (often also referred to as a sequential counter). The value will be set when the object is stored in the database. That is, when persisting a runtime object or creating an object in a database connected data source.
Example: The Object Class Order has Sequential Identifier enabled, with a Starting Value of 10000. The last Order in the database has a Sequential Identifier of 12003. This means the next Order will get a Sequential Identifier of 12004. In this case, we may use the Sequential Identifier as the Order number.
Note: If you enable this property when objects have already been created in an object class, only the new objects will be assigned a Sequential Identifier.
Starting Value
Only applicable when Sequential Identifier is enabled. This is the starting value of the Sequential Identifier. The default is 1, but you may choose a higher starting value (for example, if you want to generate order numbers starting at 10000, you may set Starting Value to 10000)
By default, when 2 different users update the same object, the last write wins.
Users John and Paula both read company ThirtyFifty Inc into a runtime only data source.
John updates the Status to Inactive, Paula updates the Status to Prospect. Both at the same time. The changes have not yet been saved.
John clicks Save. The entry in the database is updated to Inactive.
Paula clicks Save. The same entry in the database is updated to Prospect.
The outcome: ThirtyFifty Inc's Status is updated to Prospect. The last write (Paula) wins.
The built-in Object Class Property Strict Object Versioning allows you to enable first write wins.
Users John and Paula both read company ThirtyFifty Inc into a runtime only data source.
John updates the Status to Inactive, Paula updates the Status to Prospect. Both at the same time. The changes has not yet been saved.
John clicks Save. The entry in the database is updated to Inactive.
Paula clicks Save. An exception is thrown (ConflictError (34013)), and the entry is not updated.
The outcome: ThirtyFifty Inc's Status is updated to Inactive. The first write (John) wins.
Enabling Strict Object Versioning also enables a built-in integer property Version No for the objects of this Object Class. The Version No is automatically incremented every time the object is successfully updated.
Please note
It is not recommended to use Subscribe to updates with Strict Object Versioning since this might break the strict versioning control.
Components dispatching frequently updates might not work in conjunction with Strict Object Versioning as subsequent updates might be dispatched with the old version number.
Data connectors or updates using GraphQL cannot be used in conjunction with Strict Object Versioning .
To optimize performance, Appfarm caches signed URLs. The caching behaviour depends on the URL's time to live (TTL):
TTL < 4 hours: Cached for half the specified TTL.
TTL >= 4 hours: Cached for 2 hours.
Note that changing the TTL only affects newly generated URLs. Existing URLs and cached URLs remain unaffected.
Enable Endpoint
Enable GraphQL
Expose this object class via a GraphQL endpoint.
Endpoint Name
The name of the GraphQL endpoint. This is generated automatically based on the Collection Name of the object class. Warning: If the GraphQL endpoint is used in Production and this name is changed, existing queries will need to be altered.
Enable Read
Enable Aggregate
Enable Create
Enable Update
Enable Delete
To maintain an overview of the personal information you are storing, you can assign a GDPR classification and describe why this information is collected and stored and how this information is used. Please refer to your subscription agreement for further information about your obligations around data privacy.
GDPR Classification
A privacy classification for the data stored in this property. The options are:
None: This property does not store personal information.
Personal: This property stores personal information. For example name, address, phone number, email address, social security number, or profile picture.
Sensitive: This property stores sensitive personal information. For example ethnic origin, political views, religion, health information, or sexual orientation.
GDPR Details
A description of why this information is collected and stored and how it is used. For your own reference.
Create
Create a new object in this object class.
Read
Read data within objects in this object class.
Update
Update (edit) data within objects in this object class.
Delete
Delete objects in this object class.
Aggregate
To read and modify objects in an object class you must first create a in an app or service. You can then use action nodes to within an object class, assign values to the properties you have defined, and (store) the data in the database.
Every solution has one built-in object class called User. This object class represents the of your apps. The User object class cannot be modified, but it can be referenced in the same way as any other object class.
This is a special type of object class that stores files such as documents and images in the database. For example, PDFs created using the or files and images by end-users should be stored in file object classes. For static files used in your apps, you should use .
Hover over the + icon in the bottom-right of the .
File object classes have to store file metadata.
These general properties describe an object class and are not to be confused with that are used to store data.
A property that may be used to represent an object, for example in .
Add .
You can enable additional . When any of the properties below are enabled, these properties will be stored for each new record.
This property is useful when you need to publicly expose a unique reference to an object, for example, when or generating ticket references. Note: If you enable this property when objects have already been created in an object class, only the new objects will be automatically assigned a random identifier. For existing objects, it is necessary to via the GraphQL interface.
This setting is only available for . It controls the lifespan of the generated signed URL, which can be used to provide external access to the file. The setting specifies how long (in seconds) the URL remains valid for accessing the file. If not set, the default lifetime is 12 hours (43 200 seconds). It can be set to a minimum of 60 seconds and a maximum of 1 week (604 800 seconds).
Enable the for this object class.
Exposure of an object class via must be explicitly enabled. The specific types of and that should be available must also be enabled.
In addition to these properties, to successfully run those queries and mutations, you need to have a role with the appropriate , and GraphQL must be enabled for the .
data within objects in this object class.
Run aggregation queries such as .
a new object in this object class.
(edit) data within objects in this object class.
objects in this object class.
Object class permissions form a key part of your solutions' security. They determine which roles can access and modify data in that object class. By default, the Owners, Maintainers, and Developers get full read and write access to each object class when it's created.
When editing an object class you can grant and revoke permissions for the built-in roles as well as for each custom role. You can also edit these rules for all object classes under . Changes to object class permissions require a to come into effect in an environment.
Run aggregation queries such as via GraphQL.
See article .
