fix: modify SelectField.findAndSetDefaultValue() to use nub value for associated property

refs #592

src/app/formulaire/elements/select/select-field.ts

@@ -132,22 +132,37 @@ export abstract class SelectField extends Field {
     }
 
     /**
-     * try to find a default value to select
+     * Try to find a default value to select.
+     * Priority order :
+     *   - passed parameter
+     *   - nub value for associated property
+     *   - default value from configuration file
+     *   - first select entry
      */
     protected findAndSetDefaultValue(value?: string) {
         // default to first available entry if any
         if (this._entries.length > 0) {
             let val: SelectEntry;
+
             if (value !== undefined) {
                 val = this.getEntryFromValue(enumValueFromString(this._associatedProperty, value));
-            } else if (this._configDefaultValue === undefined) {
-                val = this._entries[0];
-            } else {
+                if (val === undefined) {
+                    throw Error("invalid select default value " + value + " for " + this._associatedProperty + " property");
+                }
+            } else if (this.nub !== undefined) {
+                val = this.getEntryFromValue(this.nub.getPropValue(this._associatedProperty));
+                if (val === undefined) {
+                    throw Error("invalid select default value for " + this._associatedProperty + " property");
+                }
+            } else if (this._configDefaultValue !== undefined) {
                 val = this.getEntryFromValue(enumValueFromString(this._associatedProperty, this._configDefaultValue));
                 if (val === undefined) {
                     throw Error("invalid select default value " + this._configDefaultValue + " for " + this._associatedProperty + " property");
                 }
+            } else {
+                val = this._entries[0];
             }
+
             if (this._multiple) {
                 this.setValue([val]);
             } else {