Class Paginator

This class is used to handle automatic model data pagination.

Properties summary

$_config protected

array

Runtime config
$_configInitialized protected

bool

Whether the config property has already been configured with defaults
$_defaultConfig protected

array

Default pagination settings.
$_pagingParams protected

array

Paging params after pagination operation is done.

Method Summary

_configDelete() protected

Deletes a single config key.
_configRead() protected

Reads a config key.
_configWrite() protected

Writes a config key.
_extractFinder() protected

Extracts the finder name and options out of the provided pagination options.
_prefix() protected

Prefixes the field with the table alias if possible.
_removeAliases() protected

Remove alias if needed.
addPageCountParams() protected

Add "page" and "pageCount" params.
addPrevNextParams() protected

Add "prevPage" and "nextPage" params.
addSortingParams() protected

Add sorting / ordering params.
addStartEndParams() protected

Add "start" and "end" params.
buildParams() protected

Build pagination params.
checkLimit() public

Check the limit parameter and ensure it's within the maxLimit bounds.
configShallow() public

Merge provided config with existing config. Unlike config() which does a recursive merge for nested keys, this method does a simple merge.
extractData() protected

Extract pagination data needed
getAllowedParameters() protected

Shim method for reading the deprecated whitelist or allowedParameters options
getConfig() public

Returns the config.
getConfigOrFail() public

Returns the config for this specific key.
getCount() protected

Get total count of records.
getDefaults() public

Get the settings for a $model. If there are no settings for a specific repository, the general settings will be used.
getPagingParams() public

Get paging params after pagination operation.
getQuery() protected

Get query for fetching paginated results.
getSortableFields() protected

Shim method for reading the deprecated sortWhitelist or sortableFields options.
mergeOptions() public

Merges the various options that Paginator uses.
paginate() public

Handles automatic pagination of model records.
setConfig() public

Sets the config.
validateSort() public

Validate that the desired sorting can be performed on the $object.

Method Detail

_configDelete() protected

_configDelete(string $key)

Deletes a single config key.

Parameters

string $key: Key to delete.

Throws

Cake\Core\Exception\Exception
if attempting to clobber existing config

_configRead() protected

_configRead(?string $key)

Reads a config key.

Parameters

string|null $key: Key to read.

Returns

mixed

_configWrite() protected

_configWrite(mixed $key, mixed $value, mixed $merge)

Writes a config key.

Parameters

string|array $key: Key to write to.
mixed $value: Value to write.
bool|string $merge optional: True to merge recursively, 'shallow' for simple merge, false to overwrite, defaults to false.

Throws

Cake\Core\Exception\Exception
if attempting to clobber existing config

_extractFinder() protected

_extractFinder(array $options)

Extracts the finder name and options out of the provided pagination options.

Parameters

array $options: the pagination options.

Returns

array

An array containing in the first position the finder name and in the second the options to be passed to it.

_prefix() protected

_prefix(\Cake\Datasource\RepositoryInterface $object, array $order, bool $allowed)

Prefixes the field with the table alias if possible.

Parameters

\Cake\Datasource\RepositoryInterface $object: Repository object.
array $order: Order array.
bool $allowed optional: Whether or not the field was allowed.

Returns

array

Final order array.

_removeAliases() protected

_removeAliases(array $fields, string $model)

Remove alias if needed.

Parameters

array $fields: Current fields
string $model: Current model alias

Returns

array

$fields Unaliased fields where applicable

addPageCountParams() protected

addPageCountParams(array $params, array $data)

Add "page" and "pageCount" params.

Parameters

array $params: Paging params.
array $data: Paginator data.

Returns

array

Updated params.

addPrevNextParams() protected

addPrevNextParams(array $params, array $data)

Add "prevPage" and "nextPage" params.

Parameters

array $params: Paginator params.
array $data: Paging data.

Returns

array

Updated params.

addSortingParams() protected

addSortingParams(array $params, array $data)

Add sorting / ordering params.

Parameters

array $params: Paginator params.
array $data: Paging data.

Returns

array

Updated params.

addStartEndParams() protected

addStartEndParams(array $params, array $data)

Add "start" and "end" params.

Parameters

array $params: Paging params.
array $data: Paginator data.

Returns

array

Updated params.

buildParams() protected

buildParams(array $data)

Build pagination params.

Parameters

array $data: Paginator data containing keys 'options', 'count', 'defaults', 'finder', 'numResults'.

Returns

array

Paging params.

checkLimit() public

checkLimit(array $options)

Check the limit parameter and ensure it's within the maxLimit bounds.

Parameters

array $options: An array of options with a limit key to be checked.

Returns

array

An array of options for pagination.

configShallow() public

configShallow(mixed $key, mixed $value)

Merge provided config with existing config. Unlike config() which does a recursive merge for nested keys, this method does a simple merge.

Setting a specific value:

$this->configShallow('key', $value);

Setting a nested value:

$this->configShallow('some.nested.key', $value);

Updating multiple config settings at the same time:

$this->configShallow(['one' => 'value', 'another' => 'value']);

Parameters

string|array $key: The key to set, or a complete array of configs.
mixed|null $value optional: The value to set.

Returns

$this

extractData() protected

extractData(\Cake\Datasource\RepositoryInterface $object, array $params, array $settings)

Extract pagination data needed

Parameters

\Cake\Datasource\RepositoryInterface $object: The repository object.
array $params: Request params
array $settings: The settings/configuration used for pagination.

Returns

array

Array with keys 'defaults', 'options' and 'finder'

getAllowedParameters() protected

getAllowedParameters()

Shim method for reading the deprecated whitelist or allowedParameters options

Returns

string[]

getConfig() public

getConfig(?string $key, mixed $default)

Returns the config.

Usage

Reading the whole config:

$this->getConfig();

Reading a specific value:

$this->getConfig('key');

Reading a nested value:

$this->getConfig('some.nested.key');

Reading with default value:

$this->getConfig('some-key', 'default-value');

Parameters

string|null $key optional: The key to get or null for the whole config.
mixed $default optional: The return value when the key does not exist.

Returns

mixed

Configuration data at the named key or null if the key does not exist.

getConfigOrFail() public

getConfigOrFail(string $key)

Returns the config for this specific key.

The config value for this key must exist, it can never be null.

Parameters

string $key: The key to get.

Returns

mixed

Configuration data at the named key

Throws

InvalidArgumentException

getCount() protected

getCount(\Cake\Datasource\QueryInterface $query, array $data)

Get total count of records.

Parameters

\Cake\Datasource\QueryInterface $query: Query instance.
array $data: Pagination data.

Returns

int|null

getDefaults() public

getDefaults(string $alias, array $settings)

Get the settings for a $model. If there are no settings for a specific repository, the general settings will be used.

Parameters

string $alias: Model name to get settings for.
array $settings: The settings which is used for combining.

Returns

array

An array of pagination settings for a model, or the general settings.

getPagingParams() public

getPagingParams()

Get paging params after pagination operation.

Returns

array

getQuery() protected

getQuery(\Cake\Datasource\RepositoryInterface $object, ?\Cake\Datasource\QueryInterface $query, array $data)

Get query for fetching paginated results.

Parameters

\Cake\Datasource\RepositoryInterface $object: Repository instance.
\Cake\Datasource\QueryInterface|null $query optional: Query Instance.
array $data: Pagination data.

Returns

\Cake\Datasource\QueryInterface

getSortableFields() protected

getSortableFields(array $config)

Shim method for reading the deprecated sortWhitelist or sortableFields options.

Parameters

array $config: The configuration data to coalesce and emit warnings on.

Returns

string[]|null

mergeOptions() public

mergeOptions(array $params, array $settings)

Merges the various options that Paginator uses.

Pulls settings together from the following places:

General pagination settings
Model specific settings.
Request parameters

The result of this method is the aggregate of all the option sets combined together. You can change config value allowedParameters to modify which options/values can be set using request parameters.

Parameters

array $params: Request params.
array $settings: The settings to merge with the request data.

Returns

array

Array of merged options.

paginate() public

paginate(object $object, array $params, array $settings)

Handles automatic pagination of model records.

Configuring pagination

When calling paginate() you can use the $settings parameter to pass in pagination settings. These settings are used to build the queries made and control other pagination settings.

If your settings contain a key with the current table's alias. The data inside that key will be used. Otherwise the top level configuration will be used.

$settings = [
   'limit' => 20,
   'maxLimit' => 100
 ];
 $results = $paginator->paginate($table, $settings);

The above settings will be used to paginate any repository. You can configure repository specific settings by keying the settings with the repository alias.

$settings = [
   'Articles' => [
     'limit' => 20,
     'maxLimit' => 100
   ],
   'Comments' => [ ... ]
 ];
 $results = $paginator->paginate($table, $settings);

This would allow you to have different pagination settings for Articles and Comments repositories.

Controlling sort fields

By default CakePHP will automatically allow sorting on any column on the repository object being paginated. Often times you will want to allow sorting on either associated columns or calculated fields. In these cases you will need to define an allowed list of all the columns you wish to allow sorting on. You can define the allowed sort fields in the $settings parameter:

$settings = [
  'Articles' => [
    'finder' => 'custom',
    'sortableFields' => ['title', 'author_id', 'comment_count'],
  ]
];

Passing an empty array as sortableFields disallows sorting altogether.

Paginating with custom finders

You can paginate with any find type defined on your table using the finder option.

$settings = [
   'Articles' => [
     'finder' => 'popular'
   ]
 ];
 $results = $paginator->paginate($table, $settings);

Would paginate using the find('popular') method.

You can also pass an already created instance of a query to this method:

$query = $this->Articles->find('popular')->matching('Tags', function ($q) {
  return $q->where(['name' => 'CakePHP'])
});
$results = $paginator->paginate($query);

Scoping Request parameters

By using request parameter scopes you can paginate multiple queries in the same controller action:

$articles = $paginator->paginate($articlesQuery, ['scope' => 'articles']);
$tags = $paginator->paginate($tagsQuery, ['scope' => 'tags']);

Each of the above queries will use different query string parameter sets for pagination data. An example URL paginating both results would be:

/dashboard?articles[page]=1&tags[page]=2

Parameters

\Cake\Datasource\RepositoryInterface|\Cake\Datasource\QueryInterface $object: The repository or query to paginate.
array $params optional: Request params
array $settings optional: The settings/configuration used for pagination.

Returns

\Cake\Datasource\ResultSetInterface

Query results

Throws

Cake\Datasource\Exception\PageOutOfBoundsException

setConfig() public

setConfig(mixed $key, mixed $value, mixed $merge)

Sets the config.

Usage

Setting a specific value:

$this->setConfig('key', $value);

Setting a nested value:

$this->setConfig('some.nested.key', $value);

Updating multiple config settings at the same time:

$this->setConfig(['one' => 'value', 'another' => 'value']);

Parameters

string|array $key: The key to set, or a complete array of configs.
mixed|null $value optional: The value to set.
bool $merge optional: Whether to recursively merge or overwrite existing config, defaults to true.

Returns

$this

Throws

Cake\Core\Exception\Exception
When trying to set a key that is invalid.

validateSort() public

validateSort(\Cake\Datasource\RepositoryInterface $object, array $options)

Validate that the desired sorting can be performed on the $object.

Only fields or virtualFields can be sorted on. The direction param will also be sanitized. Lastly sort + direction keys will be converted into the model friendly order key.

You can use the allowedParameters option to control which columns/fields are available for sorting via URL parameters. This helps prevent users from ordering large result sets on un-indexed values.

If you need to sort on associated columns or synthetic properties you will need to use the sortableFields option.

Any columns listed in the allowed sort fields will be implicitly trusted. You can use this to sort on synthetic columns, or columns added in custom find operations that may not exist in the schema.

The default order options provided to paginate() will be merged with the user's requested sorting field/direction.

Parameters

\Cake\Datasource\RepositoryInterface $object: Repository object.
array $options: The pagination options being used for this request.

Returns

array

An array of options with sort + direction removed and replaced with order if possible.

Property Detail

`$_config` protected

Runtime config

Type

array

`$_configInitialized` protected

Whether the config property has already been configured with defaults

Type

bool

`$_defaultConfig` protected

Default pagination settings.

When calling paginate() these settings will be merged with the configuration you provide.

maxLimit - The maximum limit users can choose to view. Defaults to 100
limit - The initial number of items per page. Defaults to 20.
page - The starting page, defaults to 1.
allowedParameters - A list of parameters users are allowed to set using request parameters. Modifying this list will allow users to have more influence over pagination, be careful with what you permit.

Type

array

`$_pagingParams` protected

Paging params after pagination operation is done.

Type

array

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https://api.cakephp.org/4.1/class-Cake.Datasource.Paginator.html