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`static::class` is also used by `DataObject::getDefaultSearchContext()`.
243 lines
7.0 KiB
Markdown
243 lines
7.0 KiB
Markdown
---
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title: Scaffolding with SearchContext
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summary: Configure the search form within ModelAdmin using the SearchContext class.
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icon: search
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---
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# SearchContext
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[SearchContext](api:SilverStripe\ORM\Search\SearchContext) manages searching of properties on one or more [DataObject](api:SilverStripe\ORM\DataObject) types, based on a given set of
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input parameters. [SearchContext](api:SilverStripe\ORM\Search\SearchContext) is intentionally decoupled from any controller-logic, it just receives a set of
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search parameters and an object class it acts on.
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The default output of a [SearchContext](api:SilverStripe\ORM\Search\SearchContext) is either a [SQLSelect](api:SilverStripe\ORM\Queries\SQLSelect) object for further refinement, or a
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[DataObject](api:SilverStripe\ORM\DataObject) instance.
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[notice]
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[SearchContext](api:SilverStripe\ORM\Search\SearchContext) is mainly used by [ModelAdmin](/developer_guides/customising_the_admin_interface/modeladmin).
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[/notice]
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## Usage
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Defining search-able fields on your DataObject.
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```php
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use SilverStripe\ORM\DataObject;
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class MyDataObject extends DataObject
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{
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private static $searchable_fields = [
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'Name',
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'ProductCode'
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];
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}
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```
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## Customizing fields and filters
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In this example we're defining three attributes on our MyDataObject subclass: `PublicProperty`, `HiddenProperty`
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and `MyDate`. The attribute `HiddenProperty` should not be searchable, and `MyDate` should only search for dates
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*after* the search entry (with a `GreaterThanFilter`).
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```php
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use SilverStripe\ORM\Filters\PartialMatchFilter;
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use SilverStripe\ORM\Filters\GreaterThanFilter;
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use SilverStripe\ORM\Search\SearchContext;
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use SilverStripe\ORM\DataObject;
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class MyDataObject extends DataObject
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{
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private static $db = [
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'PublicProperty' => 'Text'
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'HiddenProperty' => 'Text',
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'MyDate' => 'Date'
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];
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public function getDefaultSearchContext()
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{
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$fields = $this->scaffoldSearchFields([
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'restrictFields' => ['PublicProperty','MyDate']
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]);
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$filters = [
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'PublicProperty' => new PartialMatchFilter('PublicProperty'),
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'MyDate' => new GreaterThanFilter('MyDate')
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];
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return new SearchContext(
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static::class,
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$fields,
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$filters
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);
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}
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}
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```
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[notice]
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See the [SearchFilter](../model/searchfilters) documentation for more information about filters to use such as the
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`GreaterThanFilter`.
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[/notice]
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[notice]
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In case you need multiple contexts, consider name-spacing your request parameters by using `FieldList->namespace()` on
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the `$fields` constructor parameter.
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[/notice]
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### Generating a search form from the context
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```php
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use SilverStripe\Forms\Form;
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use SilverStripe\Forms\FieldList;
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use SilverStripe\Forms\FormAction;
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use SilverStripe\CMS\Controllers\ContentController;
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// ..
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class PageController extends ContentController
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{
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public function SearchForm()
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{
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$context = singleton('MyDataObject')->getCustomSearchContext();
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$fields = $context->getSearchFields();
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$form = new Form($this, "SearchForm",
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$fields,
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new FieldList(
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new FormAction('doSearch')
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)
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);
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return $form;
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}
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public function doSearch($data, $form)
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{
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$context = singleton('MyDataObject')->getCustomSearchContext();
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$results = $context->getResults($data);
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return $this->customise([
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'Results' => $results
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])->renderWith('Page_results');
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}
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}
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```
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### Pagination
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For pagination records on multiple pages, you need to wrap the results in a
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`PaginatedList` object. This object is also passed the generated `SQLSelect`
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in order to read page limit information. It is also passed the current
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`HTTPRequest` object so it can read the current page from a GET var.
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```php
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use SilverStripe\ORM\PaginatedList;
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public function getResults($searchCriteria = [])
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{
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$start = ($this->getRequest()->getVar('start')) ? (int)$this->getRequest()->getVar('start') : 0;
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$limit = 10;
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$context = singleton('MyDataObject')->getCustomSearchContext();
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$query = $context->getQuery($searchCriteria, null, ['start'=>$start,'limit'=>$limit]);
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$records = $context->getResults($searchCriteria, null, ['start'=>$start,'limit'=>$limit]);
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if($records) {
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$records = new PaginatedList($records, $this->getRequest());
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$records->setPageStart($start);
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$records->setPageLength($limit);
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$records->setTotalItems($query->unlimitedRowCount());
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}
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return $records;
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}
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```
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notice that if you want to use this getResults function, you need to change the function doSearch for this one:
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```php
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public function doSearch($data, $form)
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{
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$context = singleton('MyDataObject')->getCustomSearchContext();
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$results = $this->getResults($data);
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return $this->customise([
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'Results' => $results
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])->renderWith(['Catalogo_results', 'Page']);
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}
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```
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The change is in **$results = $this->getResults($data);**, because you are using a custom getResults function.
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Another thing you cant forget is to check the name of the singleton you are using in your project. the example uses
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**MyDataObject**, you need to change it for the one you are using
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### The Pagination Template
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to show the results of your custom search you need at least this content in your template, notice that
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Results.PaginationSummary(4) defines how many pages the search will show in the search results. something like:
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**Next 1 2 *3* 4 5 … 558**
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```ss
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<% if $Results %>
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<ul>
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<% loop $Results %>
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<li>$Title, $Autor</li>
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<% end_loop %>
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</ul>
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<% else %>
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<p>Sorry, your search query did not return any results.</p>
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<% end_if %>
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<% if $Results.MoreThanOnePage %>
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<div id="PageNumbers">
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<p>
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<% if $Results.NotFirstPage %>
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<a class="prev" href="$Results.PrevLink" title="View the previous page">Prev</a>
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<% end_if %>
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<span>
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<% loop $Results.PaginationSummary(4) %>
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<% if $CurrentBool %>
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$PageNum
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<% else %>
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<% if $Link %>
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<a href="$Link" title="View page number $PageNum">$PageNum</a>
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<% else %>
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…
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<% end_if %>
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<% end_if %>
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<% end_loop %>
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</span>
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<% if $Results.NotLastPage %>
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<a class="next" href="$Results.NextLink" title="View the next page">Next</a>
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<% end_if %>
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</p>
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</div>
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<% end_if %>
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```
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## Available SearchFilters
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See [SearchFilter](api:SilverStripe\ORM\Filters\SearchFilter) API Documentation
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## Related Documentation
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* [ModelAdmin](/developer_guides/customising_the_admin_interface/modeladmin)
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## API Documentation
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* [SearchContext](api:SilverStripe\ORM\Search\SearchContext)
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* [DataObject](api:SilverStripe\ORM\DataObject)
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