fixed chained dot value referencing in functions (for record/list parameter types)

fastn-js/src/to_js.rs

@@ -1034,6 +1034,17 @@ impl ExpressionGenerator {
         };
 
         if node.operator().get_variable_identifier_read().is_some() && !no_getter {
+            let chain_dot_operator_count = value.matches('.').count();
+            // When there are chained dot operator value
+            // like person.name, person.meta.address
+            if chain_dot_operator_count > 1 {
+                return format!(
+                    "fastn_utils.getter({})",
+                    get_chained_getter_string(value.as_str())
+                );
+            }
+
+            // When there is no chained dot operator value
             format!("fastn_utils.getter({})", value)
         } else {
             value
@@ -1108,6 +1119,24 @@ impl ExpressionGenerator {
     }
 }
 
+pub fn get_chained_getter_string(value: &str) -> String {
+    let chain_dot_operator_count = value.matches('.').count();
+    if chain_dot_operator_count > 1 {
+        if let Some((variable, key)) = value.rsplit_once('.') {
+            // Ignore values which are already resolved with get()
+            if key.contains("get") {
+                return value.to_string();
+            }
+            return format!(
+                "fastn_utils.getterByKey({}, \"{}\")",
+                get_chained_getter_string(variable),
+                key.replace('-', "_") // record fields are stored in snake case
+            );
+        }
+    }
+    value.to_string()
+}
+
 #[cfg(test)]
 #[track_caller]
 pub fn e(f: fastn_js::Ast, s: &str) {

ftd/t/js/69-chained-dot-value-in-functions.ftd

@@ -0,0 +1,55 @@
+-- record Person:
+caption name:
+integer age:
+Metadata meta:
+
+-- record Metadata:
+string address:
+string phone-number:
+
+-- string list places: Bangalore, Mumbai, Chennai, Kolkata
+
+-- Person list people:
+
+-- Person: Sam Ather
+age: 30
+
+-- Person.meta:
+address: Sam Ather City at Some Other House
+phone-number: +987-654321
+
+-- Person: $r
+
+-- end: people
+
+-- Metadata meta:
+address: Sam City in Some House
+phone-number: +1234-56789
+
+-- Person r: Sam Wan
+age: 23
+meta: $meta
+
+-- ftd.text: $some-details(person = $r, places = $places, date = 27th October)
+
+-- ftd.text: $more-details(p = $r)
+
+-- ftd.text: $first-person-details(people = $people)
+
+-- string more-details(p):
+Person p:
+
+"Person " + p.name + " lives at " + p.meta.address + ". His contact number is " + p.meta.phone-number
+
+-- string some-details(person, places):
+Person person:
+string list places:
+string date:
+
+"This person named " + person.name + " has first visited " + places.0 + " on " + date
+
+-- string first-person-details(people):
+Person list people:
+
+"First Person is " + people.0.name + " lives at " + people.0.meta.address + ". His contact number is " + people.0.meta.phone-number
+