Building the "Order Management" Training App : Configuring business rules - Constraints

Prerequisite : The Order object has a state model

What is a Constraint ?

In Simplicité, constraints allow to enforce business rules by dynamically controlling object properties, visibility, and behavior, while ensuring secure backend validation... Learn more

Adding a Constraint to the Order Business Object

Create a Constraint to implement the following business rule : The order quantity can only be updated on a rew record and at the "Pending" state

To do so, follow the steps below :

1. In the Business objects > Business objects menu, open TrnOrder

2. In the Constraints panel linked to the Business object, click Create
   

3. Fill in the Constraint information like so :

   • Name : TrnOrderConstraint-1
   • Description : "The order quantity can only be updated on a rew record and at the "Pending" state" (click the edit button to change the description)
   • Order : 10
   • Effects Front-end | Back-end
   • Type : Expression
   • Expression : true
     

4. Click Save

5. In the Impacts panel, click Create
   

6. Fill in the Impact information like so :

   • Order : 10
   • Apply to : Field property
   • Object / Field : trnOrdQuantity (use the magnifying glass* button to select the field)
   • Field property : Updatable
   • Expression : [ISNEW] || [STATUS].equals("P")

   [ISNEW] returns true if the record is in a Creation context
   [STATUS] return the value of the trnOrdState field

   

7. Click Save & Close

Test the Constraint with the usertest User

Clear the platform's cache and log in using usertest

For a detailed step-by-step, see : Testing the User

Success

For a new Order, the Quantity field is updatable

For a Validated Order, the Quantity field is read-only