Extending FormHelper's create()
According to everything on Google, extending FormHelper to control site-wide defaults should be easy. And it pretty much is. Except there is a "gotcha" with create() and I had to dig around in all the various files to figure out where it was falling down.
create() takes 2 arguments ($model & $options), both of which are optional. If $model is empty Cake will use $options to set up everything.
Easy, right? Right. And it lets you do things like this:
$this -> Form -> create()
However, if you have extended FormHelper's create() and you are doing this...
$this -> Form -> create(array(option, option, option))
Without explicitly declaring the model, the automagic will bite you in the bum.
FormHelper::create looks like this:
create($model = null, $options = array())
But the problem arises when you have not set a model, and Cake has swapped $options for $model. Now you have 2 arrays that you feed back to parent::create($model,$options). See the problem?
It gets tripped up on FormHelper.php around line 237:
if ($model !== false) {
list($plugin, $model) = pluginSplit($model, true)....
Then pluginSplit is expecting a string, but gets fed an array and it falls over.
The solution is to declare either the model OR to simply set it to null, so Cake won't swap $options to $model.
$this -> Form -> create(null, array(option, option, option))
$this -> Form -> create(ModelName, array(option, option,option))
(Where, of course, ModelName is the name of your model)
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