fix(replaced_when): fixed bug that the value (prior state) was not po…

…pulated when condition was false

examples/replaced_when/file_inexistence_check/main.tf

@@ -0,0 +1,23 @@
+terraform {
+  required_providers {
+    value = {
+      source  = "github.com/pseudo-dynamic/value"
+      version = "0.1.0"
+    }
+  }
+}
+
+resource "value_replaced_when" "findme_inexistence" {
+  for_each = {
+    "findme" : {
+      fullname = "${path.module}/findme"
+    }
+  }
+
+  condition = !fileexists(each.value.fullname)
+}
+
+output "findme_inexistence_check" {
+  // On craetion this should contain a non-null value.value
+  value = value_replaced_when.findme_inexistence
+}

internal/provider/replaced_when_resource.go

@@ -84,14 +84,14 @@ func (r *ReplacedWhenResource) ModifyPlan(ctx context.Context, req resource.Modi
 	}
 
 	var newValue types.String
-
-	if !suppliedCondition.Unknown {
-		if currentValue.IsUnknown() || suppliedCondition.Value {
-			// First creation of attribute / state value won't never be null again
-			// OR supplied condition (config) is known (the latter condition is also
-			// true if the unknown condition has been computed once and didn't change
-			// and is therefore not unknown anymore)
-
+	var currentValueNotOnceSet = currentValue.IsUnknown() || currentValue.IsNull()
+
+	if currentValueNotOnceSet || !suppliedCondition.Unknown {
+		// Empty value (state) / state value won't never be unknown or null again
+		// OR supplied condition (config) is known (the latter condition is also
+		// true if the unknown condition has been computed once and didn't change
+		// and is therefore not unknown anymore)
+		if currentValueNotOnceSet || suppliedCondition.Value {
 			// if currentValue.IsUnknown() {
 			// 	newValue = types.String{Null: true}
 			// } else {

internal/provider/replaced_when_resource_schema.go

@@ -45,7 +45,9 @@ resource creation and resource deletion as change you can try the following appr
 			"value": {
 				Type:     types.StringType,
 				Computed: true,
-				Description: `If the very first condition is false or remains false, then the value remains unchanged. 
+				Description: `If the very first condition is false, then the value will be once initialized by a random value.
+
+If the condition is false or remains false, then the value remains unchanged. 
 The condition change from true to false does not trigger a replacement of those who use the value as
 target for replace_triggered_by.