Delete task resources when creation fails (#350)

* Delete task resources when creation fails

* Add human–friendly error messages

Author: 0x2b3bfa0

iterative/resource_task.go

@@ -2,6 +2,7 @@ package iterative
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"strings"
 	"time"
@@ -145,7 +146,12 @@ func resourceTaskCreate(ctx context.Context, d *schema.ResourceData, m interface
 	}
 
 	if err := task.Create(ctx); err != nil {
-		return diagnostic(diags, err, diag.Error)
+		diags = diagnostic(diags, err, diag.Error)
+		if err := task.Delete(ctx); err == nil {
+			diags = diagnostic(diags, errors.New("deleted all the remaining resources"), diag.Warning)
+		} else {
+			diags = diagnostic(diags, err, diag.Error)
+		}
 	}
 
 	d.SetId(task.GetIdentifier(ctx).Long())