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attached_node.module
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Written by Mark Howell 2004
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Some of this code was lifted from other modules, including image.module.
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Update Aug 18, 04: I'm trying to keep up with changes in CVS as preparations
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for drupal 4.5 are made. This code isn't as frozen as I thought it was,
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so I apologize if the docs are out of date or the code doesn't work. -MH
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Purpose of this module:
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Allow users to refer to other nodes from within the body or teaser of a node.
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Provide a somewhat standard means of formatting the link to such nodes.
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Allow user to customize position and attributes of this link/reference.
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This is implemented for the most part as an output filter.
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Installation:
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To setup this module, just place attached_node.module in your modules directory,
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then go to administr->input formats and click "configure" to configure whatever
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input format you want to use this feature.
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Enable "Attached Node Filter" and save your configuration.
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Click the "configure filters" tab to configure all filters for this input format.
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There will be a section for "Attached Node codes". Click the
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"Enable Attached Node codes" checkbox to turn this filter on.
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Additionally, if you want your users to be able to specify parameters for
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displaying each node, put them here for each node type.
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Common parameters include "title" for most node types and "res" for image
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nodes. "res" can be set to any of the resolutions you configured with the
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image module. A value of "original" will display the original resolution.
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Parameters to avoid include nid, uid, teaser and body.
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That's it. It's ready to use. Test it out by creating a node (say it's
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nid is 123, for example). Then create another node and attach the previously
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created node to it using the following syntax:
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[node:123]
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You can place this tag anywhere in the body and it will get translated on the
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fly.
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The most popular use case for document management in this crowd seems to be
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attaching images to stories and blog entries. Arguments have gone round and
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round about what is the best way to do this, and in the process of trying to
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figure out what will make the most people happy, I have come to a compromise.
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I originally designed a relational database model for managing attached nodes
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and all of the maintenance code that goes with it. After much thought, and
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coming across the filter that the image module uses, it occurred to me that
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perhapse the best solution was the simplest one: use meta tags.
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I took the concept that the image module used for tag format and made it a bit
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more generalized. The format currently is of the form:
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[node:NID, align="center", height="50", title="look at this stupid article"]
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..where NID is the node id of the node being linked to, and all of the optional
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parameters are specific to whatever type of node is being linked to.
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Image nodes, for instance, would display a thumbnail in this tag's place (similar
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to how the [image:NID..] tag works with the image.module. Each node's allowed
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parameters are specified on the filter admin page. You can allow your users to
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override whatever node properties you would like. Some don't make sense (like nid)
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so caveat emptor, but nothing gets overwritten unless you explicitly set up
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permissions to do so. Additionally, these properties are only overwritten for
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the purposes of displaying the node. Nothing is saved to the database.
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Security is adhered to by checking <code>node_access("view", $node)</code> for
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every node that gets translated.
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The tricky part doesn't exist yet. On each form edit page, there should be a
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link to "attach node". This should pop up the "Create Content" (node/add) page.
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Along with this page will be the understanding that whatever node gets created
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will eventually be referenced from the original node. This can be done several
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ways and I have not decided yet how exactly this will be done.
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1. Form Keys:
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The original node (parent) will have a form key generated. Children nodes
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will need to maintain this key until they are saved. The form key gets placed
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in a table awaiting the parent to be saved. When the parent is saved, meta
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tags from all children are appended. This could be done at the preview phase
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as well.
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2. Javascript:
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Upon saving a child node, the node body form element of the parent will have
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a meta tag referring to the child appended to it. This will allow the user
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to immediately customize the position and attributes of the attachment.
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There are other techniques, but these are the two that I'm most considering.
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-Mark Howell
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