Provides a basic array based context provider for FormHelper.

This adapter is useful in testing or when you have forms backed by simple array data structures.

Important keys:

• data Holds the current values supplied for the fields.
• defaults The default values for fields. These values will be used when there is no data set. Data should be nested following the dot separated paths you access your fields with.
• required A nested array of fields, relationships and boolean flags to indicate a field is required. The value can also be a string to be used as the required error message
• schema An array of data that emulate the column structures that Cake\Database\Schema\Schema uses. This array allows you to control the inferred type for fields and allows auto generation of attributes like maxlength, step and other HTML attributes. If you want primary key/id detection to work. Make sure you have provided a _constraints array that contains primary. See below for an example.
• errors An array of validation errors. Errors should be nested following the dot separated paths you access your fields with.

Example

$article = [
   'data' => [
     'id' => '1',
     'title' => 'First post!',
   ],
   'schema' => [
     'id' => ['type' => 'integer'],
     'title' => ['type' => 'string', 'length' => 255],
     '_constraints' => [
       'primary' => ['type' => 'primary', 'columns' => ['id']]
     ]
   ],
   'defaults' => [
     'title' => 'Default title',
   ],
   'required' => [
     'id' => true, // will use default required message
     'title' => 'Please enter a title',
     'body' => false,
   ],
 ];