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04-01-2009, 12:52 PM

[eluser]dgibsonky[/eluser]
Hi folks--please forgive another noob for being dense, but I've read numerous posts here and elsewhere regarding the act of passing data to & from models and still can't make it work. It seems pretty simple, but I'm undoubtedly missing some detail somewhere.

Here's a sample controller (built on the 'welcome' controller for speed's sake):

Code:
&lt;?php

class Welcome extends Controller {

    function Welcome()

    {

        parent::Controller();    

    }

    function index()

    {

        $this->load->view('welcome_message');

    }

    function test ()

        {

        $data['point1'] = "green eggs and ham";

        $data['point2'] = "sausage biscuits";

        $data['point3'] = "maple & brown sugar oatmeal";

        //load model and pass data to it

        $this->load->model('test_model');

        $this->test_model->testify('$data');

        //echo the data returned from the model--point1 should 

        //have changed

        echo "controller data:".'<pre>';

        print_r($data);

        echo '</pre>';

        //pass data to view

        $this->load->view('test_view', $data);

        }

}

And the model:

Code:
&lt;?php

class Test_model extends Model {

    function Test_model()

    {

        parent::Model();

    }

    function testify()

    {

        //change point1 of data

        $data['point1'] = "I do not like green eggs and ham!";

        //echo data to see if it has the complete array or just

        //the new point1

        echo "model data:".'<pre>';

        print_r($data);

        echo '</pre>';

        return $data;

    }

}

And finally, the view:

Code:
&lt;html&gt;

    &lt;head&gt;

        &lt;title&gt;Test_view&lt;/title&gt;

    &lt;/head&gt;

    &lt;body&gt;

        View data:<br/>

        <pre>

            &lt;?php 

            //echo data to see if it's the complete array

            print_r($data); ?&gt;

        </pre>

    &lt;/body&gt;

&lt;/html&gt;

When I load welcome/test in the browser, I get the following:

Quote:model data:
Array
(
[point1] => I do not like green eggs and ham!
)

controller data:
Array
(
[point1] => green eggs and ham
[point2] => sausage biscuits
[point3] => maple & brown sugar oatmeal
)

View data:

A PHP Error was encountered

Severity: Notice
Message: Undefined variable: data
Filename: views/test_view.php
Line Number: 9

Obviously, in a REAL model I'd be working with the database. What I'm trying to accomplish in the sample is to a) establish the $data array; b) pass $data to the model, where it is modified by calls to the db (or updates the db), c)pass the modified $data back to the controller and on to the view. Unfortunately, $data appears to be unique in each file, rather than being handed back and forth.

All of that said, what painfully obvious thing am I missing? Thanks in advance!

04-01-2009, 12:56 PM

[eluser]Tom Schlick[/eluser]

Code:
$data = $this->test_model->testify($data);

no quotes in parameters
and your model function has to be like so

Code:
function testify($data)

    {

        //change point1 of data

        $data['point1'] = "I do not like green eggs and ham!";

        //echo data to see if it has the complete array or just

        //the new point1

        echo "model data:".'<pre>';

        print_r($data);

        echo '</pre>';

        return $data;

    }

notice the data variable in the parameters of the function

you have to assign the vairable data to the returned information from the model.

04-01-2009, 01:39 PM

[eluser]dgibsonky[/eluser]
trs, you are a scholar and a gentleman! Everything is perfect now. I did also realize that, in my view, I cannot call on $data directly:

Code:
//bad mojo:

print_r($data);

Because $data is exploded into its individual elements when entering the view, it no longer exists, and I have to call each element individually:

Code:
//good mojo:

echo $point1."<br>";

echo $point2."<br>";

echo $point3."<br>";

As I said, it's all happy now, and thanks again for your fast and excellent help!