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7.2. Collections

A collection is a set of resources of the same type. The API provides both top-level collections and sub-collections. This section examines common features for collections.
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7.2.1. Listing All Resources in a Collection
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A listing of the resources in a collection is obtained by issuing a GET request on the collection URI obtained from the entry point. 
GET /api/[collection] HTTP/1.1
Accept: application/xml

HTTP/1.1 200 OK
Content-Type: application/xml

<collection>
    <resource id="resource_id" href="/api/collection/resource_id">
        <name>Resource-Name</name>
        <description>A description of the resource</description>
        ...
    </resource>
    ...
</collection>
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7.2.2. Listing Extended Resource Sub-Collections
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The API extends collection representations to include sub-collections when the Accept header includes the detail parameter. 
GET /api/collection HTTP/1.1
Accept: application/xml; detail=subcollection
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This includes multiple sub-collection requests using either separated detail parameters: 
GET /api/collection HTTP/1.1
Accept: application/xml; detail=subcollection1; detail=subcollection2
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Or one detail parameter that separates the sub-collection with the + operator: 
GET /api/collection HTTP/1.1
Accept: application/xml; detail=subcollection1+subcollection2+subcollection3
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The API supports extended sub-collections for the following main collections.
Expand
Table 7.3. Collections that use extended sub-collections
Collection Extended Sub-Collection Support
hosts statistics
bricks statistics
step statistics

Example 7.1. An request for extended statistics in the servers collection

GET /api/hosts HTTP/1.1
Accept: application/xml; detail=statistics
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7.2.3. Searching Collections with Queries
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A GET request on a "collection/search" link results in a search query of that collection. The API only returns resources within the collection that satisfy the search query constraints. 
GET /api/collection?search={query} HTTP/1.1
Accept: application/xml

HTTP/1.1 200 OK
Content-Type: application/xml
<collection>
    <resource id="resource_id" href="/api/collection/resource_id">
        ...
    </resource>
    ...
</collection>
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7.2.3.1. Query Syntax
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The API uses the URI templates to perform a search query with a GET request: 
GET /api/collection?search={query} HTTP/1.1
Accept: application/xml
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The query template value refers to the search query the API directs to the collection. This query uses the same format as Red Hat Storage Console search query language:
(criteria) [sortby (element) asc|desc]
The sortby clause is optional and only needed when ordering results.
Expand
Table 7.4. Example search queries
Collection Criteria Result
volumes type=REPLICATE Displays a list of all replicate volumes
events severity>normal sortby time Displays the list of all events with severity higher than normal and sorted by the time element values.
events severity>normal sortby time desc Displays the list of all events with severity higher than normal and sorted by the time element values in descending order.
The API requires the query template to be URL-encoded to translate reserved characters, such as operators and spaces.

Example 7.2. URL-encoded search query

GET /api/events?search=severity%3Derror HTTP/1.1
Accept: application/xml
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Important

All search queries are case-sensitive.
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7.2.3.2. Wildcards
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Search queries substitute part of a value with an asterisk as a wildcard.

Example 7.3. Wildcard search query for name=server*

GET /api/hosts?search=name%3Dserver* HTTP/1.1
Accept: application/xml
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This query would result in all servers with names beginning with server, such as server-1, server-2, or server-data.

Example 7.4. Wildcard search query for name=s*1

GET /api/hosts?search=name%3D*1 HTTP/1.1
Accept: application/xml
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This query would result in all servers with names beginning with s and ending with 1, such as server1 or server-1 .
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7.2.4. Creating a Resource in a Collection
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The API creates a new resource with a POST request to the collection URI containing a representation of the new resource.
A POST request requires a Content-Type: application/xml header. This informs the API of the XML representation in the body content as part of the request.
Each resource type has its own specific required properties. The client supplies these properties as XML elements when creating a new resource. Refer to the individual resource type documentation for more details. If a required property is absent, the creation fails with a fault representation indicating the missing elements. 
POST /api/collection HTTP/1.1
Accept: application/xml
Content-Type: application/xml

<resource>
    <name>Resource-Name</name>
</resource>

HTTP/1.1 201 Created
Content-Type: application/xml

<resource id="resource_id" href="/api/collection/resource_id">
    <name>Resource-Name</name>
    ...
</resource>
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The Location header in the response gives the URI of the queried resource. The response body contains either a complete representation, partial representation or no representation of the resource. It is recommended that clients rely only on fetching the representation via the URI in the response header.
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