Question

I try to rewrite sales_order_view
Here is what I have in config.xml

        <blocks>
        <adminhtml>
            <rewrite>
                <sales_order_view>Bitstream_FancourierSelfawb_Block_View</sales_order_view>
            </rewrite>
        </adminhtml>
        <bitstream_selfawb>
            <class>Bitstream_FancourierSelfawb_Block</class>
        </bitstream_selfawb>
    </blocks>

Ofcorse, I have the proper file in Bitstream/FancourierSelfawb/Block

All I need is to add a button but looking over other modules I see that block is already overwritten.

        <blocks>
        <adminhtml>
            <rewrite>
                <sales_order_view>Fooman_EmailAttachments_Block_View</sales_order_view>
            </rewrite>
        </adminhtml>
    </blocks>

If I comment this in config.xml from Fooman module I can see my button. Otherwise, no luck.
Is there a way to overwrite same block twice in different module?

Answer 1

In app/etc/modules/Bitstream_FancourierSelfawb.xml add a depends node.

<config>
    <modules>
        <Bitstream_FancourierSelfawb>
            ...
            <depends>
                <Fooman_EmailAttachments />
            </depends>
        </Bitstream_FancourierSelfawb>
    </modules>
</config>

Of course your Bitstream_FancourierSelfawb_Block_View class will have to extend Fooman_EmailAttachments_Block_View directly instead of the Mage original.

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If you want your addition to work both with and without the Fooman extension then you’ll have to resort to a lengthier event-based method.