{
  "name": "Collection quantifiers",
  "description": "Any / All / None test a nested condition against every element of a collection field, and count measures one. Field paths inside the condition resolve against the element; \"$\" is the element itself.",
  "rules": [
    {
      "id": "restricted-item-present",
      "description": "Any: at least one order line is a restricted category. Inexpressible with In/NotIn, which compare a single scalar against a set.",
      "condition": {
        "field": "Order.Lines",
        "operator": "Any",
        "condition": { "field": "Category", "operator": "In", "value": ["alcohol", "tobacco", "firearms"] }
      },
      "actions": [
        { "type": "setOutput", "target": "AgeCheckRequired", "value": true },
        { "type": "appendToOutput", "target": "Reasons", "value": "restricted-item" }
      ]
    },
    {
      "id": "everything-in-stock",
      "description": "All: every line is available. Vacuously true for an empty collection, false when the field is null.",
      "condition": {
        "field": "Order.Lines",
        "operator": "All",
        "condition": { "field": "InStock", "operator": "Equals", "value": true }
      },
      "actions": [ { "type": "setOutput", "target": "ShipsImmediately", "value": true } ],
      "else": [ { "type": "setOutput", "target": "ShipsImmediately", "value": false } ]
    },
    {
      "id": "no-backorders",
      "description": "None: the mirror of Any. An element condition is an ordinary condition tree, so groups nest inside it.",
      "condition": {
        "field": "Order.Lines",
        "operator": "None",
        "condition": {
          "type": "group",
          "operator": "AND",
          "rules": [
            { "field": "InStock", "operator": "Equals", "value": false },
            { "field": "Quantity", "operator": "GreaterThan", "value": 0 }
          ]
        }
      },
      "actions": [ { "type": "appendToOutput", "target": "Reasons", "value": "no-backorders" } ]
    },
    {
      "id": "priority-tag",
      "description": "\"$\" is the element itself, which is how a collection of scalars is tested.",
      "condition": {
        "field": "Order.Tags",
        "operator": "Any",
        "condition": { "field": "$", "operator": "Equals", "value": "priority" }
      },
      "actions": [ { "type": "setOutput", "target": "Priority", "value": true } ]
    },
    {
      "id": "bulk-order",
      "description": "count measures a collection, so a size test goes through the ordinary computed left-hand side.",
      "condition": {
        "expression": { "op": "count", "operands": [ { "field": "Order.Lines" } ] },
        "operator": "GreaterThan",
        "value": 3
      },
      "actions": [
        { "type": "setOutput", "target": "BulkOrder", "value": true },
        { "type": "setOutput", "target": "LineCount", "value": { "op": "count", "operands": [ { "field": "Order.Lines" } ] } }
      ]
    }
  ]
}