如何知道Magento中的帖子键？

Question

I went through this tutorial: http://www.smashingmagazine.com/2014/03/13/tutorial-create-admin-manageable-magento-entity-brands/ .

When accessing the post data, the author uses:

 $this->getRequest()->getPost('brandData')

I am wondering how can we know there is a brandData key in the post data?

---

NOTE: I know I can see the available keys using the

var_dump($this->getRequest()->getPost())

But I want to know how to know it without manually print the whole post data.

Answer 1

The available fields all yield from html form elements whose values have been sent to the controller that then works with the post data.

So there probably is a code snippet similar to this one

<form method="post" action="/path/to/your/controllerAction">
    <input type="text" name="brandData" value="Default value" />
</form>

on the page used to send data to your controller.