Custom Automation Conditions

The Automation Engine has various out-of-the box Conditions, but there can be cases where you wish to make your own custom condition

If you think the Condition you need so be an out-of-the-box Condition feel free to open an issue or create a Pull Request with your custom Condition

Steps to make a custom Condition

1. Make a new C# class and Call it 'MyCustomCondition' (or what you like it to be called but it is recommended to suffix it 'Condition')
2. Let the class implement interface IAutomationCondition
3. Let the class implement the mandatory member IsConditionMetAsync

Basic Example

//Your custom Condition
public class MyCustomCondition: IAutomationCondition
{
    public async Task<bool> IsConditionMetAsync(WebhookAction webhookAction)
    {
        //Your Logic if the Condition is met

        WebhookActionData webhookActionData = webhookAction.Data; //This object has data about the event
        TrelloClient trelloClient = webhookAction.TrelloClient; //If you need the TrelloClient to access data from Trello to evaluate your event you have access to it here

        return false; //Return true if the Condition is met (aka continue to Actions) or False if not met (stop processing)
    }
}

Inside the IsConditionMetAsync you have access to the WebhookAction (aka the JSON given by the Webhook) + The TrelloClient for further data lookups if needed

Real Examples

To better get a sense of how Conditions look are here links to the various real-time implementations for inspiration:

• Source Code: CardCoverCondition
• Source Code: CardFieldCondition
• Source Code: ChecklistItemsCompleteCondition
• Source Code: ChecklistItemsIncompleteCondition
• Source Code: ChecklistIncompleteCondition
• Source Code: ChecklistNotStartedCondition
• Source Code: LabelCondition
• Source Code: ListCondition
• Source Code: MemberCondition