Multiple Rules

A single policy can contain multiple rules. The last rule in the set is the “golden rule” — the one whose result determines the overall outcome. A single policy can contain multiple rules. The “golden rule” is the rule that everything evaluates to.

The Golden Rule

When a policy has multiple rules, the engine evaluates them in order of result. The golden rule is the one that produces the final result. Earlier rules exist as building blocks.

# Sub-rule 1
A **user** passes the age check
  if __age__ of **user** is greater than or equal to 18.

# Sub-rule 2
A **user** passes the status check
  if __status__ of **user** is equal to "active".

# Golden rule
A **user** is eligible
  if the **user** passes the age check
  and the **user** passes the status check.

Interactive Example

Reset

Policy Rule

A **user** passes the age check if __age__ of **user** is greater than or equal to 18. A **user** passes the status check if __status__ of **user** is equal to "active". A **user** is eligible if the **user** passes the age check and the **user** passes the status check.

Test Data (JSON)

{ "user": { "age": 25, "status": "active" } }

▶ Run

Rule References

The golden rule references sub-rules using the pattern:

the **selector** outcome_verb outcome_value

For example, the **user** passes the age check references the rule “A user passes the age check”.

Using Labels

You can also use labels to reference sub-rules:

ageCheck. A **user** passes the age check
  if __age__ of **user** is greater than or equal to 18.

statusCheck. A **user** passes the status check
  if __status__ of **user** is equal to "active".

A **user** is eligible
  if §ageCheck passes
  and §statusCheck passes.

Interactive Example

Reset

Policy Rule

ageCheck. A **user** passes the age check if __age__ of **user** is greater than or equal to 18. statusCheck. A **user** passes the status check if __status__ of **user** is equal to "active". memberCheck. A **user** passes the member check if __membership__ of **user** is in ["gold", "platinum"]. A **user** is eligible if §ageCheck passes and §statusCheck passes and §memberCheck passes.

Test Data (JSON)

{ "user": { "age": 30, "status": "active", "membership": "gold" } }

▶ Run

Benefits of Multi-Rule Policies

• Readability — each rule focuses on one check
• Reusability — sub-rules can be referenced by multiple golden rules
• Debugging — the trace shows which sub-rule passed or failed
• Maintainability — change one sub-rule without touching others