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| <li><a href="autocomplete-annotations.html">Autocomplete Annotations</a></li> |
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| <article class="doc"> |
| <a name="section-top"></a> |
| <h1 class="page">Autocomplete Annotations</h1> |
| <div class="paragraph"> |
| <p>Actions that accept an entity as a parameter provide a mechanism for finding the entity; either a bounded set of choices, or an autocomplete (enter a number of characters and then search for entities that match).</p> |
| </div> |
| <div class="paragraph"> |
| <p>The QueryDSL module provides a simplified way of providing an autocomplete for a given entity class. |
| For each of the properties that should be used in the search, annotated using <a href="../../refguide/latest/applib/index/annotation/Property.html#queryDslAutoComplete" class="xref page">Property#queryDslAutoComplete()</a>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>For example:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">@Title |
| @Column(length = Name.MAX_LEN, nullable = false, name = "name") |
| @Getter @Setter @ToString.Include |
| @Property(queryDslAutoComplete = QueryDslAutoCompletePolicy.INCLUDE) <i class="conum" data-value="1"></i><b>(1)</b> |
| private String name;</code></pre> |
| </div> |
| </div> |
| <div class="colist arabic"> |
| <table> |
| <tr> |
| <td><i class="conum" data-value="1"></i><b>1</b></td> |
| <td>property is explicitly searched in any autocomplete query. |
| <div class="paragraph"> |
| <p>If multiple properties have been annotated, then the entered value needs to match any one of the properties (the query performed uses <code>OR</code>, not <code>AND</code>).</p> |
| </div></td> |
| </tr> |
| </table> |
| </div> |
| <div class="paragraph"> |
| <p>The behaviour of the query can be modified in several ways, using various attributes of <a href="../../refguide/latest/applib/index/annotation/DomainObject.html#queryDslAutoCompleteAdditionalPredicateRepository" class="xref page">@DomainObject</a>):</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><a href="../../refguide/latest/applib/index/annotation/DomainObject.html#queryDslAutoCompleteMinLength" class="xref page">@DomainObject#queryDslAutoCompleteMinLength</a>)</p> |
| <div class="paragraph"> |
| <p>Specifies the minimum number of characters to be entered before a search is performed; the default if not specified is 1 character.</p> |
| </div> |
| </li> |
| <li> |
| <p><a href="../../refguide/latest/applib/index/annotation/DomainObject.html#queryDslAutoCompleteLimitResults" class="xref page">@DomainObject#queryDslAutoCompleteLimitResults</a>),</p> |
| <div class="paragraph"> |
| <p>Specifies the maximum number of candidate entities returned in the drop down list; the default if not specified is 50.</p> |
| </div> |
| </li> |
| <li> |
| <p><a href="../../refguide/latest/applib/index/annotation/DomainObject.html#queryDslAutoCompleteAdditionalPredicateRepository" class="xref page">@DomainObject#queryDslAutoCompleteAdditionalPredicateRepository</a>)</p> |
| <div class="paragraph"> |
| <p>Specifies the repository class that contains a method (default name "queryDslAutoCompleteAdditionalPredicates") which returns a predicate that is applied to every auto-complete query.</p> |
| </div> |
| <div class="paragraph"> |
| <p>This can be used for example to restrict the query so that each user is only prompted with entities that they have access to.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The default name of the method can be overridden (see below).</p> |
| </div> |
| </li> |
| <li> |
| <p><a href="../../refguide/latest/applib/index/annotation/DomainObject.html#queryDslAutoCompleteAdditionalPredicateMethod" class="xref page">@DomainObject#queryDslAutoCompleteAdditionalPredicateMethod</a>)</p> |
| <div class="paragraph"> |
| <p>If an additional predicate repository has been defined, this method allows the name of the method returning the additional predicate to be overridden from its default name.</p> |
| </div> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>For example, suppose (for some strange reason) that we want to limit the selection only to objects where their <code>attachment</code> property is not populated:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>specify the additional predicate repository/method:</p> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">@DomainObject( |
| queryDslAutoCompleteMinLength = 3, |
| queryDslAutoCompleteLimitResults = 30, |
| queryDslAutoCompleteAdditionalPredicateRepository = SimpleObjectRepository.class, |
| queryDslAutoCompleteAdditionalPredicateMethod = "autoFilter" |
| ) |
| public class SimpleObject implements Comparable<SimpleObject> { /*...*/ }</code></pre> |
| </div> |
| </div> |
| </li> |
| <li> |
| <p>implement the predicate method with the correct signature:</p> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">import com.querydsl.core.types.Predicate; |
| import com.querydsl.core.types.dsl.PathBuilder; |
| |
| @Service |
| public class SimpleObjectRepository extends QueryDslRepository<SimpleObject, QSimpleObject> { |
| |
| //... |
| |
| public Function<PathBuilder<SimpleObject>, Predicate> autoFilter( |
| String search |
| ) { |
| return so -> so.getString("attachment").isNull(); <i class="conum" data-value="1"></i><b>(1)</b> |
| } |
| |
| //... |
| }</code></pre> |
| </div> |
| </div> |
| <div class="colist arabic"> |
| <table> |
| <tr> |
| <td><i class="conum" data-value="1"></i><b>1</b></td> |
| <td>In this (silly) example, the auto complete will only propose objects that meet the additional criteria (in this case, that the <code>SimpleObject#attachment</code> property is null).</td> |
| </tr> |
| </table> |
| </div> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>As a more realistic example, this filter excludes any agreements that are no longer current:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">public Function<PathBuilder<Agreement>, Predicate> autoFilter( |
| final String searchPhrase |
| ) { |
| return a -> a.getDate("endDate", LocalDate.class).isNull() |
| .or(a.getDate("endDate", LocalDate.class).goe(clockService.nowAsLocalDate())); |
| }</code></pre> |
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