CakePhp: Custom Pagination Methods

I wanted to use the CakePhp pagination helper to paginate some complex records. The model that the paginator was referencing had both belongsTo and hasMany associations. belongsTo associations are not a problem. hasMany, I discovered, are — which makes sense when I think about.

As the ticket notes:

You can only paginate LEFT JOIN tables by default. hasMany relationships are performed as a separate query, and thus cannot have conditions in the primary paginate() call. If you wish to do this, you need to implement paginate() and paginateCount() in your model.

So that’s what I did. Only it wasn’t quite as simple as I thought it would be.

The CakePhp manual does provide some guidance: 4.9.4 Custom Query Pagination. This comes from the example originally posted here (littlehart.net), where there are additional comments to both confuse and clarify a bit.

One thing that I didn’t see ever made explicit is how exactly you integrate the custom model methods you create, paginate and paginateCount, with the paginator syntax in your controller or helper. Well, it turns out, as you would probably hope, that it’s fairly seamless. You just use the standard pagination markup , and the custom methods override Cake’s default methods (this changeset illustrates).

With hasMany associations, as is the case in the example above from Cake’s website, you are probably going to need to use GROUP BY syntax. For my particular case, this required a custom SQL query, which meant using Cake’s Model class’s query. (I’m a little surprised and concerned that it doesn’t support bind parameters.)

I’ve posted the relevant code to my wiki: http://www.klenwell.com/is/Paste20090117

I hope it helps steers someone to the answer they’re looking for.

Advertisements
CakePhp: Custom Pagination Methods

2 thoughts on “CakePhp: Custom Pagination Methods

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s