Struct Rule 

pub struct Rule {
    pub id: String,
    pub priority: i32,
    pub predicate: Predicate,
    pub action: String,
    pub metadata: Option<Map<String, Value>>,
}

An individual rule with conditions and action.

Fields

• id: Unique identifier for the rule
• priority: Evaluation priority (lower = higher precedence, default: 0)
• predicate: Condition tree (deserialized from conditions field)
• action: Action identifier (informational, not evaluated by engine)
• metadata: Optional metadata for tracing, compliance, or custom annotations

JSON Format

{
  "id": "Premium_User",
  "priority": 1,
  "conditions": {"user.tier": {"$equals": "Gold"}},
  "action": "apply_discount",
  "metadata": {
    "source": "Pricing Rules v2.3",
    "tags": ["premium", "discount"]
  }
}

The metadata field is optional and will be included in evaluation results if present.

Fields

id: String

priority: i32

predicate: Predicate

action: String

metadata: Option<Map<String, Value>>

Trait Implementations

impl Clone for Rule

fn clone(&self) -> Rule

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Rule

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Rule

fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for Rule

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.