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| <a name="section-top"></a> |
| <h1 class="page">Apache Isis v2 Profile (Simplified Representation)</h1> |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The representations defined by the RO spec are very rich and enable complex client-side applications to be built. |
| However, their sophistication can be an impediment to their use if one wishes to write a simple app using third-party components that expect to consume much simpler representations.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Apache Isis also provides support for its own simplified representation for the most commonly-used representations. |
| This is implemented using the <a href="../../../refguide/2.0.0-M5/viewer/index/restfulobjects/rendering/service/conneg/ContentNegotiationService.html" class="page">ContentNegotiationService</a> described in the |
| <a href="../content-negotiation.html" class="page">architecture</a> chapter.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="accept-header"><a class="anchor" href="#accept-header"></a>Accept Header</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The RO spec uses the standard <code>Accept</code> header for content negotiation, and defines its own "profile" for the standard representations; these take the form:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code>Accept: application/json;profile="urn:org.restfulobjects:repr-types/xxx"</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>where "xxx" varies by resource. |
| The detail can be found in <a href="https://www.restfulobjects.org/spec/1.0/section-a/chapter-02.html#_2-4-1-representationtype-profile-parameter">section 2.4.1</a> of the RO spec.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The "Isis" profile allows the client to request simplified representations for the most frequently accessed resources. |
| This is done by specifying an <code>Accept</code> header of:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code>Accept: application/json;profile="urn:org.apache.isis/v2"</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Not every resource supports this header, but the most commonly accessed ones do. |
| In each case the server will set the |
| <code>Content-Type</code> header so that the client knows how to process the representation.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The <a href="https://www.youtube.com/watch?v=HMSqapQDY_4">screencast</a> demonstrates the feature.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The sections below explain in a little more detail what is returned when this profile is activated.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="domain-object"><a class="anchor" href="#domain-object"></a>Domain Object</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>If a domain object resource (<a href="https://www.restfulobjects.org/spec/1.0/section-c/chapter-14.html">section 14</a>) is accessed with the Apache Isis profile, the resultant representation is a JSON object with simple key/value pairs for each property.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The contents of any collections are also eagerly returned, consisting of an array of elements of each referenced object. |
| Each such element contains key/value pairs of each property (in other words, a grid of data is returned). |
| Each element also has a special <code>$$href</code> property (so that the client can easily navigate to a resource for that object) and a <code>$$title</code> property (to use as a label, eg the hyperlink text).</p> |
| </div> |
| <div class="paragraph"> |
| <p>In addition, the representation defined by the RO spec is also included, under a special <code>$$ro</code> property.</p> |
| </div> |
| <div class="paragraph"> |
| <p>For example, in a todo app, accessing this resource:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code>http://localhost:8080/restful/objects/TODO/45</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>with an <code>Accept</code> request header of:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code>Accept: application/json;profile="urn:org.apache.isis/v2"</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>returns the following representation:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code>{ |
| "$$href" : "http://localhost:8080/restful/objects/TODO/45", <i class="conum" data-value="1"></i><b>(1)</b> |
| "$$instanceId" : "45", <i class="conum" data-value="2"></i><b>(2)</b> |
| "$$title" : "Buy bread due by 2015-12-04", <i class="conum" data-value="3"></i><b>(3)</b> |
| "description" : "Buy bread", <i class="conum" data-value="4"></i><b>(4)</b> |
| "category" : "Domestic", |
| "subcategory" : "Shopping", |
| "complete" : false, |
| "atPath" : "/users/sven", |
| ... |
| "similarTo" : [ { <i class="conum" data-value="5"></i><b>(5)</b> |
| "$$href" : "http://localhost:8080/restful/objects/TODO/46", |
| "$$instanceId" : "46", |
| "$$title" : "Buy milk due by 2015-12-04", |
| "description" : "Buy milk", |
| "category" : "Domestic", |
| ... |
| }, { |
| "$$href" : "http://localhost:8080/restful/objects/TODO/47", |
| "$$instanceId" : "47", |
| "$$title" : "Buy stamps due by 2015-12-04", |
| "description" : "Buy stamps", |
| "category" : "Domestic", |
| ... |
| }, |
| ... |
| } ], |
| "dependencies" : [ ], |
| "$$ro" : { <i class="conum" data-value="6"></i><b>(6)</b> |
| "links" : [ ... ], |
| "extensions" : { /* ... */ }, |
| "title" : "Buy bread due by 2015-12-04", |
| "domainType" : "TODO", |
| "instanceId" : "45", |
| "members" : { /* ... */ } |
| } |
| }</code></pre> |
| </div> |
| </div> |
| <div class="colist arabic"> |
| <table> |
| <tr> |
| <td><i class="conum" data-value="1"></i><b>1</b></td> |
| <td>hyperlink to the representation</td> |
| </tr> |
| <tr> |
| <td><i class="conum" data-value="2"></i><b>2</b></td> |
| <td>instance id of the domain object (unique within its type)</td> |
| </tr> |
| <tr> |
| <td><i class="conum" data-value="3"></i><b>3</b></td> |
| <td>title of the domain object</td> |
| </tr> |
| <tr> |
| <td><i class="conum" data-value="4"></i><b>4</b></td> |
| <td>all the properties of the domain object (to which the caller has access), as key/value pairs</td> |
| </tr> |
| <tr> |
| <td><i class="conum" data-value="5"></i><b>5</b></td> |
| <td>contents of each collection</td> |
| </tr> |
| <tr> |
| <td><i class="conum" data-value="6"></i><b>6</b></td> |
| <td>special <code>$$ro</code> json-prop, being the normal RO Spec representation for this object</td> |
| </tr> |
| </table> |
| </div> |
| <div class="paragraph"> |
| <p>with a <code>Content-Type</code> header:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code>Content-Type: application/json; |
| profile="urn:org.apache.isis/v2";repr-type="object"</code></pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="object-collection"><a class="anchor" href="#object-collection"></a>Domain Object Collection</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>If a domain object collection (<a href="https://www.restfulobjects.org/spec/1.0/section-c/chapter-17.html">section 17</a>) is accessed with this profile, then the resultant representation is as an array of elements of key/value for each referenced object, and again each element the containing the key/value pairs of the properties of that object (a grid, again).</p> |
| </div> |
| <div class="paragraph"> |
| <p>In addition, the representation defined by the RO spec is also included, as a special object with a single <code>$$ro</code> |
| property.</p> |
| </div> |
| <div class="paragraph"> |
| <p>For example, in a todo app, accessing this resource:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code>http://localhost:8080/restful/objects/TODO/45/collections/similarTo</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>with an <code>Accept</code> request header of:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code>Accept: application/json;profile="urn:org.apache.isis/v2"</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>returns the following representation:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code>[ <i class="conum" data-value="1"></i><b>(1)</b> |
| { |
| "$$href" : "http://localhost:8080/restful/objects/TODO/46", <i class="conum" data-value="2"></i><b>(2)</b> |
| "$$instanceId" : "46", <i class="conum" data-value="3"></i><b>(3)</b> |
| "$$title" : "Buy milk due by 2015-12-04", <i class="conum" data-value="4"></i><b>(4)</b> |
| "description" : "Buy milk", <i class="conum" data-value="5"></i><b>(5)</b> |
| "category" : "Domestic", |
| ... |
| }, { |
| "$$href" : "http://localhost:8080/restful/objects/TODO/47", |
| "$$title" : "Buy stamps due by 2015-12-04", |
| "description" : "Buy stamps", |
| "category" : "Domestic", |
| ... |
| }, { |
| "$$href" : "http://localhost:8080/restful/objects/TODO/48", |
| "$$title" : "Mow lawn due by 2015-12-10", |
| "description" : "Mow lawn", |
| "category" : "Domestic", |
| ... |
| }, |
| ... |
| , { |
| "$$ro" : { <i class="conum" data-value="6"></i><b>(6)</b> |
| "id" : "similarTo", |
| "memberType" : "collection", |
| "links" : [ ... ], |
| "extensions" : { /* ... */ }, |
| "value" : [ ... ] |
| } |
| } |
| ]</code></pre> |
| </div> |
| </div> |
| <div class="colist arabic"> |
| <table> |
| <tr> |
| <td><i class="conum" data-value="1"></i><b>1</b></td> |
| <td>returns a JSON array, not a JSON object</td> |
| </tr> |
| <tr> |
| <td><i class="conum" data-value="2"></i><b>2</b></td> |
| <td>hyperlink to the representation</td> |
| </tr> |
| <tr> |
| <td><i class="conum" data-value="3"></i><b>3</b></td> |
| <td>instance id of the domain object (unique within its type)</td> |
| </tr> |
| <tr> |
| <td><i class="conum" data-value="4"></i><b>4</b></td> |
| <td>title of the domain object</td> |
| </tr> |
| <tr> |
| <td><i class="conum" data-value="5"></i><b>5</b></td> |
| <td>all the properties of the domain object (to which the caller has access), as key/value pairs</td> |
| </tr> |
| <tr> |
| <td><i class="conum" data-value="6"></i><b>6</b></td> |
| <td>last element is a special object with a single <code>$$ro</code> json-prop, being the normal RO Spec representation for this object</td> |
| </tr> |
| </table> |
| </div> |
| <div class="paragraph"> |
| <p>with a <code>Content-Type</code> header:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code>Content-Type: application/json;profile="urn:org.apache.isis/v2";repr-type="object-collection"</code></pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="action-invocation"><a class="anchor" href="#action-invocation"></a>Action Invocation</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>When an action is invoked (<a href="https://www.restfulobjects.org/spec/1.0/section-c/chapter-19.html">section 19</a>) it can return a domain object, a list, a scalar, or return nothing.</p> |
| </div> |
| <div class="sect2"> |
| <h3 id="returning-an-object"><a class="anchor" href="#returning-an-object"></a>Returning an Object</h3> |
| <div class="paragraph"> |
| <p>If the action returned an object, then the <a href="#vro:ROOT:simplified-representations.adoc#domain-object" class="page unresolved">domain object representation</a> is returned.</p> |
| </div> |
| <div class="paragraph"> |
| <p>For example, in a todo app, accessing this resource:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code>http://localhost:8080/restful/objects/TODO/45/actions/updateCost/invoke</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>with an <code>Accept</code> request header of:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code>Accept: application/json;profile="urn:org.apache.isis/v2"</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>returns the following representation:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code>{ |
| "$$href" : "http://localhost:8080/restful/objects/TODO/45", |
| "$$instanceId" : "45", |
| "$$title" : "Buy bread due by 2015-12-04", |
| "description" : "Buy bread", |
| "category" : "Domestic", |
| "subcategory" : "Shopping", |
| "complete" : false, |
| ... |
| "similarTo" : [ ... ] |
| ... |
| "$$ro" : { /* ... */ } |
| }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>with a <code>Content-Type</code> of:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code>Content-Type: application/json;profile="urn:org.apache.isis/v2";repr-type="object"</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>... in other words no different to a representation obtained of the returned domain object directly.</p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="returning-a-list"><a class="anchor" href="#returning-a-list"></a>Returning a List</h3> |
| <div class="paragraph"> |
| <p>On the other hand if the action returned a list (a "standalone" collection, then an array representation is returned. |
| This is very similar to that returned by a <a href="#vro:ROOT:simplified-representations.adoc#object-collection" class="page unresolved">(parented) object collection</a>, though with a slightly different <code>Content-Type</code> to distinguish.</p> |
| </div> |
| <div class="paragraph"> |
| <p>For example, in a todo app, accessing this resource:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code>http://localhost:8080/restful/services/ToDoItems/actions/notYetComplete/invoke</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>with an <code>Accept</code> request header of:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code>Accept: application/json;profile="urn:org.apache.isis/v2"</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>returns the following representation:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code>[ { |
| "$$href" : "http://localhost:8080/restful/objects/TODO/45", |
| "$$instanceId" : "45", |
| "$$title" : "Buy bread due by 2015-12-04", |
| "description" : "Buy bread", |
| "category" : "Domestic", |
| ... |
| }, { |
| "$$href" : "http://localhost:8080/restful/objects/TODO/46", |
| "$$instanceId" : "46", |
| "$$title" : "Buy milk due by 2015-12-04", |
| "description" : "Buy milk", |
| "category" : "Domestic", |
| ... |
| }, |
| ... |
| , { |
| "$$ro" : { |
| "links" : [ ... ] |
| "resulttype" : "list", |
| "result" : { /* ... */ } |
| "value" : [ ... ], |
| "links" : [ ... ], |
| "extensions" : { } |
| } |
| } |
| } ]</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>with a <code>Content-Type</code> header:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code>Content-Type: application/json;profile="urn:org.apache.isis/v2";repr-type="list"</code></pre> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="returning-scalarnothing"><a class="anchor" href="#returning-scalarnothing"></a>Returning Scalar/Nothing</h3> |
| <div class="paragraph"> |
| <p>Note that actions returning scalar values or nothing (which includes <code>void</code> actions) are not supported; for these the |
| regular RO spec representation will be returned.</p> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="configuration-properties"><a class="anchor" href="#configuration-properties"></a>Global Config Props (Deprecated)</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>If all that is required is a very simple representations (of objects), you can configure the Restful Objects viewer |
| to provide a simplified output, then this can be done with a number of (global) configuration properties.</p> |
| </div> |
| <div class="paragraph"> |
| <p>These configuration properties pre-date the support for the Apache Isis profile, and |
| are limited by the fact that they are global configuration settings, so cannot be influenced on a request-by-request |
| basis (as is the case with the <code>Accept</code> header used for the Apache Isis profile). They have therefore been |
| deprecated, and may be removed in the future.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Details can be found in <a href="../setup-and-configuration.html#deprecated" class="page">here</a>.</p> |
| </div> |
| </div> |
| </div> |
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