svenvarkel

trait My_Custom_Trait_Extension_A_Model_Product{
    /**
     * This method loads the original, rewritten class of 
     * Extension_B_Model_Product. Mind the shorthand - you need
     * to load correct original class.
     * $this becomes later part of My_Custom_Model_Product context
     */
    protected function getInstance()
    {
        if ( is_null($this->_instance) )

svenvarkel

trait My_Custom_Trait_Extension_A_Model_Product{
    /**
     * This method loads the original, rewritten class of 
     * Extension_A_Model_Product. Mind the shorthand - you need
     * to load correct original class.
     * $this becomes later part of My_Custom_Model_Product context
     */
    protected function getInstance()
    {
        if ( is_null($this->_instance) )

svenvarkel

<config>
    <modules>
        <My_Custom>
            <active>true</active>
            <codePool>local</codePool>
            <depends>
                <Extension_A />
                <Extension_B />
            </depends>
        </My_Custom>