silverstripe-framework/docs/en/02_Developer_Guides/12_Search/01_Searchcontext.md

title: Scaffolding with SearchContext summary: Configure the search form within ModelAdmin using the SearchContext class.

SearchContext

[api:SearchContext] manages searching of properties on one or more [api:DataObject] types, based on a given set of input parameters. [api:SearchContext] is intentionally decoupled from any controller-logic, it just receives a set of search parameters and an object class it acts on.

The default output of a [api:SearchContext] is either a [api:SQLQuery] object for further refinement, or a [api:DataObject] instance.

[api:SearchContext] is mainly used by [ModelAdmin](../customising_the_cms/modeladmin).

Usage

Defining search-able fields on your DataObject.

:::php
<?php

class MyDataObject extends DataObject {

   private static $searchable_fields = array(
      'Name',
      'ProductCode'
   );
}

Customizing fields and filters

In this example we're defining three attributes on our MyDataObject subclass: PublicProperty, HiddenProperty and MyDate. The attribute HiddenProperty should not be searchable, and MyDate should only search for dates after the search entry (with a GreaterThanFilter).

:::php
<?php

class MyDataObject extends DataObject {

	private static $db = array(
		'PublicProperty' => 'Text'
		'HiddenProperty' => 'Text',
		'MyDate' => 'Date'
	);
	
	public function getCustomSearchContext() {
		$fields = $this->scaffoldSearchFields(array(
			'restrictFields' => array('PublicProperty','MyDate')
		));

		$filters = array(
			'PublicProperty' => new PartialMatchFilter('PublicProperty'),
			'MyDate' => new GreaterThanFilter('MyDate')
		);

		return new SearchContext(
			$this->class, 
			$fields, 
			$filters
		);
	}
}

See the [SearchFilter](../model/searchfilters) documentation for more information about filters to use such as the `GreaterThanFilter`.

In case you need multiple contexts, consider name-spacing your request parameters by using `FieldList->namespace()` on the `$fields` constructor parameter.

Generating a search form from the context

:::php
<?php

..

class Page_Controller extends ContentController {

	public function SearchForm() {
		$context = singleton('MyDataObject')->getCustomSearchContext();
		$fields = $context->getSearchFields();

		$form = new Form($this, "SearchForm",
			$fields,
			new FieldList(
				new FormAction('doSearch')
			)
		);

		return $form;
	}

	public function doSearch($data, $form) {
		$context = singleton('MyDataObject')->getCustomSearchContext();
		$results = $context->getResults($data);

		return $this->customise(array(
			'Results' => $results
		))->renderWith('Page_results');
	}
}

Pagination

For pagination records on multiple pages, you need to wrap the results in a PaginatedList object. This object is also passed the generated SQLQuery in order to read page limit information. It is also passed the current SS_HTTPRequest object so it can read the current page from a GET var.

:::php
public function getResults($searchCriteria = array()) {
	$start = ($this->request->getVar('start')) ? (int)$this->request->getVar('start') : 0;
	$limit = 10;
		
	$context = singleton('MyDataObject')->getCustomSearchContext();
	$query = $context->getQuery($searchCriteria, null, array('start'=>$start,'limit'=>$limit));
	$records = $context->getResults($searchCriteria, null, array('start'=>$start,'limit'=>$limit));
	
	if($records) {
		$records = new PaginatedList($records, $this->request);
		$records->setPageStart($start);
		$records->setPageLength($limit);
		$records->setTotalItems($query->unlimitedRowCount());
	}
	
	return $records;
}

notice that if you want to use this getResults function, you need to change the function doSearch for this one:

:::php
public function doSearch($data, $form) {
	$context = singleton('MyDataObject')->getCustomSearchContext();
	$results = $this->getResults($data);
	return $this->customise(array(
		'Results' => $results
	))->renderWith(array('Catalogo_results', 'Page'));
}

The change is in $results = $this->getResults($data);, because you are using a custom getResults function.

Another thing you cant forget is to check the name of the singleton you are using in your project. the example uses MyDataObject, you need to change it for the one you are using

For more information on how to paginate your results within the template, see Tutorial: Site Search.

The Pagination Template

to show the results of your custom search you need at least this content in your template, notice that Results.PaginationSummary(4) defines how many pages the search will show in the search results. something like:

Next 1 2 3 4 5 … 558

:::ss
<% if $Results %>
	<ul>
		<% loop $Results %>
			<li>$Title, $Autor</li>
		<% end_loop %>
	</ul>
<% else %>
	<p>Sorry, your search query did not return any results.</p>
<% end_if %>

<% if $Results.MoreThanOnePage %>
	<div id="PageNumbers">
		<p>
			<% if $Results.NotFirstPage %>
				<a class="prev" href="$Results.PrevLink" title="View the previous page">Prev</a>
			<% end_if %>
		
			<span>
		    		<% loop $Results.PaginationSummary(4) %>
					<% if $CurrentBool %>
						$PageNum
					<% else %>
						<% if $Link %>
							<a href="$Link" title="View page number $PageNum">$PageNum</a>
						<% else %>
							&hellip;
						<% end_if %>
					<% end_if %>
				<% end_loop %>
			</span>
		
			<% if $Results.NotLastPage %>
				<a class="next" href="$Results.NextLink" title="View the next page">Next</a>
			<% end_if %>
		</p>
	</div>
<% end_if %>

Available SearchFilters

See [api:SearchFilter] API Documentation

Related Documentation

• ModelAdmin
• Tutorial: Site Search

API Documentation

• [api:SearchContext]
• [api:DataObject]