Item

This document defines the Item resource.

Items represent a resource’s membership in a list. Items have fields to describe them such as when the item was created and what type of resource it represents and typically are linked to the resource itself.

Sections

Endpoints and URL structures

OSDI does not specify specific endpoints and link structures for compliant systems to use. Rather, because OSDI is a HAL+JSON API, endpoints and structures are defined in the links section of each returned resource, starting with the API Entry Point link.

HAL’s link structure lets an API consumer move through API levels, resources, and collections by parsing and following links. While most systems will not change the value of their links often and obey RESTful design principles, the value of each link when that resource is retrieved is the only canonical value, and it can change at any time.

The link relation label for a Item resource is osdi:item for a single Item resource or osdi:items for a collection of Item resources.

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Fields

The field names for this resource, with standard names, punctuation and capitalization, and values where appropriate.

Note: As with the entire OSDI specification, the specific fields a compliant system implements will vary between each system, as will the fields each system requires when creating or updating resources, which fields are writeable, and the operations you are allowed to perform on each resource.

Common Fields

A set of common fields that appear on all resources is included first, for reference.

Name Type Description
identifiers strings[] A unique string array of identifiers in the format [system name]:[id]. See the general concepts document for more information about identifiers.
created_date datetime A read-only property representing the date and time the resource was created on the local system.
modified_date datetime A read-only property representing the date and time the resource was last modified on the local system.

Control Headers

An “osdi:control” JSON object may contain common OSDI control headers which can be used on an OSDI POST, PUT, PATCH, Helper or other function calls to modify server behavior. Read More

Name Type Description
return_response boolean Defaults to true, if specified as false, the operation does not need to return the resource representation in the response

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Item Fields

A list of fields specific to the Item resource.

Name Type Description
origin_system string A human readable identifier of the system where this item was created. (ex: “OSDI System”)
item_type string A property representing the type of resource this item links to. (ex: “osdi:person”)

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The links associated with this resource, available in the links section of the resource. Links that are part of the OSDI spec are typically prefixed with the osdi: namespace to aid in curie matching and readability.

Note: As with the entire OSDI specification, the specific links a compliant system supplies will vary between each system. In addition, systems may choose to embed a linked resource directly in the response in addition to linking to it in the links section, using the standard _embedded syntax described in the general overview documentation.

Name Type Description
self Item* A self-referential link to the item.
[resouce-name] [Resource*] A link to a single resource of the type indicated in the item_type field, representing the resource linked to the item.
list List* A link to a List resource representing the list on which this item was created.

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Scenarios

The scenarios below show some common Create, Read, Update, Delete (CRUD) operations that can be performed on this resource, as well as any resource-specific behaviors worth highlighting. The following examples are for informational purposes. The authoritative resource definitions are above in the Fields tables and should be followed in the event of a conflict with the examples.

Scenario: Retrieving a collection of Item resources (GET)

Item resources are sometimes presented as collections of items. For example, calling the items endpoint on a particular list will return a collection of all the items in that list.

Request

GET https://osdi-sample-system.org/api/v1/lists/c945d6fe-929e-11e3-a2e9-12313d316c29/items

Header:
OSDI-API-Token:[your api key here]

Response

200 OK

Content-Type: application/hal+json
Cache-Control: max-age=0, private, must-revalidate

{
    "total_pages": 10,
    "per_page": 25,
    "page": 1,
    "total_records": 250,
    "_links": {
        "next": {
            "href": "https://osdi-sample-system.org/api/v1/lists/c945d6fe-929e-11e3-a2e9-12313d316c29/items?page=2"
        },
        "osdi:items": [
            {
                "href": "https://osdi-sample-system.org/api/v1/lists/c945d6fe-929e-11e3-a2e9-12313d316c29/items/d91b4b2e-ae0e-4cd3-9ed7-d0ec501b0bc3"
            },
            {
                "href": "https://osdi-sample-system.org/api/v1/lists/c945d6fe-929e-11e3-a2e9-12313d316c29/items/1efc3644-af25-4253-90b8-a0baf12dbd1e"
            },
            //(truncated for brevity)
        ],
        "curies": [
            {
                "name": "osdi",
                "href": "https://osdi-sample-system.org/docs/v1/{rel}",
                "templated": true
            }
        ],
        "self": {
            "href": "https://osdi-sample-system.org/api/v1/lists/c945d6fe-929e-11e3-a2e9-12313d316c29/items"
        }
    },
    "_embedded": {
        "osdi:items": [
            {
                "identifiers": [
                    "osdi_sample_system:d91b4b2e-ae0e-4cd3-9ed7-d0ec501b0bc3",
                    "foreign_system:1"
                ],
                "origin_system": "OSDI Sample System",
                "created_date": "2014-03-20T21:04:31Z",
                "modified_date": "2014-03-20T21:04:31Z",
                "item_type": "osdi:person",
                "_links": {
                    "self": {
                        "href": "https://osdi-sample-system.org/api/v1/lists/c945d6fe-929e-11e3-a2e9-12313d316c29/items/d91b4b2e-ae0e-4cd3-9ed7-d0ec501b0bc3"
                    },
                    "osdi:list": {
                        "href": "https://osdi-sample-system.org/api/v1/lists/c945d6fe-929e-11e3-a2e9-12313d316c29"
                    },
                    "osdi:person": {
                        "href": "https://osdi-sample-system.org/api/v1/people/65345d7d-cd24-466a-a698-4a7686ef684f"
                    }
                }
            },
            {
                "identifiers": [
                    "osdi_sample_system:1efc3644-af25-4253-90b8-a0baf12dbd1e"
                ],
                "origin_system": "OSDI Sample System",
                "created_date": "2014-03-20T20:44:13Z",
                "modified_date": "2014-03-20T20:44:13Z",
                "item_type": "osdi:event",
                "_links": {
                    "self": {
                        "href": "https://osdi-sample-system.org/api/v1/lists/c945d6fe-929e-11e3-a2e9-12313d316c29/items/1efc3644-af25-4253-90b8-a0baf12dbd1e"
                    },
                    "osdi:list": {
                        "href": "https://osdi-sample-system.org/api/v1/lists/c945d6fe-929e-11e3-a2e9-12313d316c29"
                    },
                    "osdi:event": {
                        "href": "https://osdi-sample-system.org/api/v1/events/adb951cb-51f9-420e-b7e6-de953195ec86"
                    }
                }
            },
            //(truncated for brevity)
        ]
    }
}

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Scenario: Scenario: Retrieving an individual Item resource (GET)

Calling an individual Item resource will return the resource directly, along with all associated fields and appropriate links to additional information about the item.

Request

GET https://osdi-sample-system.org/api/v1/lists/c945d6fe-929e-11e3-a2e9-12313d316c29/items/d91b4b2e-ae0e-4cd3-9ed7-d0ec501b0bc3

Header:
OSDI-API-Token:[your api key here]

Response

200 OK

Content-Type: application/hal+json
Cache-Control: max-age=0, private, must-revalidate

{
    "identifiers": [
        "osdi_sample_system:d91b4b2e-ae0e-4cd3-9ed7-d0ec501b0bc3",
        "foreign_system:1"
    ],
    "origin_system": "OSDI Sample System",
    "created_date": "2014-03-20T21:04:31Z",
    "modified_date": "2014-03-20T21:04:31Z",
    "item_type": "osdi:person",
    "_links": {
        "self": {
            "href": "https://osdi-sample-system.org/api/v1/lists/c945d6fe-929e-11e3-a2e9-12313d316c29/items/d91b4b2e-ae0e-4cd3-9ed7-d0ec501b0bc3"
        },
        "osdi:list": {
            "href": "https://osdi-sample-system.org/api/v1/lists/c945d6fe-929e-11e3-a2e9-12313d316c29"
        },
        "osdi:person": {
            "href": "https://osdi-sample-system.org/api/v1/people/65345d7d-cd24-466a-a698-4a7686ef684f"
        }
    }
}

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Scenario: Creating a new item (POST)

Posting to the items collection endpoint and including a link to an existing resource will allow you to create a new item associated with that list and other resource. The response is the new item that was created. While each implementing system will require different fields, any optional fields not included in a post operation should not be set at all by the receiving system, or should be set to default values.

Request

POST https://osdi-sample-system.org/api/v1/lists/c945d6fe-929e-11e3-a2e9-12313d316c29/items/

Header:
OSDI-API-Token:[your api key here]

{
    "identifiers": [
        "foreign_system:1"
    ],
    "origin_system": "OpenSupporter",
    "item_type": "osdi:person",
    "_links" : {
        "osdi:person" : {
            "href" : "https://osdi-sample-system.org/api/v1/people/65345d7d-cd24-466a-a698-4a7686ef684f"
        }
    }
}

Response

200 OK

Content-Type: application/hal+json
Cache-Control: max-age=0, private, must-revalidate

{
    "identifiers": [
        "osdi_sample_system:d91b4b2e-ae0e-4cd3-9ed7-de9uemdse",
        "foreign_system:1"
    ],
    "created_date": "2014-03-20T21:04:31Z",
    "modified_date": "2014-03-20T21:04:31Z",
    "item_type": "osdi:person",
    "_links": {
        "self": {
            "href": "https://osdi-sample-system.org/api/v1/lists/c945d6fe-929e-11e3-a2e9-12313d316c29/items/d91b4b2e-ae0e-4cd3-9ed7-de9uemdse"
        },
        "osdi:list": {
            "href": "https://osdi-sample-system.org/api/v1/lists/c945d6fe-929e-11e3-a2e9-12313d316c29"
        },
        "osdi:person": {
            "href": "https://osdi-sample-system.org/api/v1/people/65345d7d-cd24-466a-a698-4a7686ef684f"
        }
    }
}

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Scenario: Modifying an item (PUT)

You can update an item by calling a PUT operation on that item’s endpoint. Your PUT should contain fields that you want to update. Missing fields will be ignored by the receiving system. Systems may also ignore PUT values, depending on whether fields you are trying to modify are read-only or not. You may set an attribute to nil by including the attribute using nil for value.

Note: Modifying members of an array separately is not supported. To change the contents of an array, first GET the current contents and then PUT back only those you wish to keep.

Request

PUT https://osdi-sample-system.org/api/v1/lists/c945d6fe-929e-11e3-a2e9-12313d316c29/items/d91b4b2e-ae0e-4cd3-9ed7-de9uemdse/

Header:
OSDI-API-Token:[your api key here]

{
    "item_type": "osdi:event",
    "_links" : {
        "osdi:event" : {
            "href" : "https://osdi-sample-system.org/api/v1/events/65345d7d-cd24-466a-a698-4a7686ef684f"
        }
    }
}

Response

200 OK

Content-Type: application/hal+json
Cache-Control: max-age=0, private, must-revalidate

{
    "identifiers": [
        "osdi_sample_system:d91b4b2e-ae0e-4cd3-9ed7-de9uemdse",
        "foreign_system:1"
    ],
    "created_date": "2014-03-20T21:04:31Z",
    "modified_date": "2014-03-20T22:04:31Z",
    "item_type": "osdi:event",
    "_links": {
        "self": {
            "href": "https://osdi-sample-system.org/api/v1/lists/c945d6fe-929e-11e3-a2e9-12313d316c29/items/d91b4b2e-ae0e-4cd3-9ed7-de9uemdse"
        },
        "osdi:list": {
            "href": "https://osdi-sample-system.org/api/v1/lists/c945d6fe-929e-11e3-a2e9-12313d316c29"
        },
        "osdi:events": {
            "href": "https://osdi-sample-system.org/api/v1/events/65345d7d-cd24-466a-a698-4a7686ef684f"
        }
    }
}

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Scenario: Deleting an item (DELETE)

You may delete an item by calling the DELETE command on the item’s endpoint.

Request

DELETE https://osdi-sample-system.org/api/v1/lists/c945d6fe-929e-11e3-a2e9-12313d316c29/items/d91b4b2e-ae0e-4cd3-9ed7-de9uemdse

Header:
OSDI-API-Token:[your api key here]

Response

200 OK

Content-Type: application/hal+json
Cache-Control: max-age=0, private, must-revalidate

{
    "notice": "This item was successfully deleted."
}

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Scenario: Optimized List Item Retrieval (GET)

Where supported by the API provider, a single request may retrieve one item (or a collection of items) along with the resource(s) they represent. For example, calling the items endpoint on a particular list will return a collection of the items in that list. If the server optionally embeds into each item the resource to which the item refers, then the client will not need to make further API calls to retrieve the end resource(s).

The following example retrieves a list collection where each item in the embedded list links to an osdi:person resource and also embeds the osdi:person resource within it:

Request

GET https://osdi-sample-system.org/api/v1/lists/c945d6fe-929e-11e3-a2e9-12313d316c29/items

Header:
OSDI-API-Token:[your api key here]

Response

200 OK

Content-Type: application/hal+json
Cache-Control: max-age=0, private, must-revalidate

{
    "total_pages": 10,
    "per_page": 25,
    "page": 1,
    "total_records": 250,
    "_links": {
        "next": {
            "href": "https://osdi-sample-system.org/api/v1/lists/c945d6fe-929e-11e3-a2e9-12313d316c29/items?page=2"
        },
        "osdi:items": [
            {
                "href": "https://osdi-sample-system.org/api/v1/lists/c945d6fe-929e-11e3-a2e9-12313d316c29/items/d91b4b2e-ae0e-4cd3-9ed7-d0ec501b0bc3"
            },
            {
                "href": "https://osdi-sample-system.org/api/v1/lists/c945d6fe-929e-11e3-a2e9-12313d316c29/items/1efc3644-af25-4253-90b8-a0baf12dbd1e"
            },
            //(truncated for brevity)
        ],
        "curies": [
            {
                "name": "osdi",
                "href": "https://osdi-sample-system.org/docs/v1/{rel}",
                "templated": true
            }
        ],
        "self": {
            "href": "https://osdi-sample-system.org/api/v1/lists/c945d6fe-929e-11e3-a2e9-12313d316c29/items"
        }
    },
    "_embedded": {
        "osdi:items": [
            {
                "identifiers": [
                    "osdi_sample_system:d91b4b2e-ae0e-4cd3-9ed7-d0ec501b0bc3"
                ],
                "origin_system": "OSDI Sample System",
                "created_date": "2017-03-20T21:04:31Z",
                "modified_date": "2017-03-20T21:04:31Z",
                "item_type": "osdi:person",
                "_links": {
                    "self": {
                        "href": "https://osdi-sample-system.org/api/v1/lists/c945d6fe-929e-11e3-a2e9-12313d316c29/items/d91b4b2e-ae0e-4cd3-9ed7-d0ec501b0bc3"
                    },
                    "osdi:list": {
                        "href": "https://osdi-sample-system.org/api/v1/lists/c945d6fe-929e-11e3-a2e9-12313d316c29"
                    },
                    "osdi:person": {
                        "href": "https://osdi-sample-system.org/api/v1/people/5d7d6534-cd24-466a-a698-4f684fa7686e"
                    }
                },
                "_embedded": {
                    "osdi:person": {
                        "_links": {
                            "self": {
                                "href": "https://osdi-sample-system.org/api/v1/people/5d7d6534-cd24-466a-a698-4f684fa7686e",
                                "title": "David Grossman"
                            }
                        },
                        "created_date": "2017-05-20T19:45:51Z",
                        "email_addresses": [
                            {
                                "address": "dgros@sample.com",
                                "primary": true,
                                "status": "subscribed"
                            }
                        ],
                        "family_name": "Grossman",
                        "given_name": "David",
                        "identifiers": [
                            "osdi-sample-system:5d7d6534-cd24-466a-a698-4f684fa7686e"
                        ],
                        "modified_date": "2017-05-20T19:45:51Z",
                        "origin_system": "OSDI Sample System",
                        "postal_addresses": [
                            {
                                "address_lines": [
                                    "123 Creek Drive"
                                ],
                                "locality": "Askov",
                                "postal_code": "55726",
                                "primary": true,
                                "region": "MN"
                            }
                        ]
                    }
                }
            },
            {
                "identifiers": [
                    "osdi_sample_system:1efc3644-af25-4253-90b8-a0baf12dbd1e"
                ],
                "origin_system": "OSDI Sample System",
                "created_date": "2014-03-20T20:44:13Z",
                "modified_date": "2014-03-20T20:44:13Z",
                "item_type": "osdi:person",
                "_links": {
                    "self": {
                        "href": "https://osdi-sample-system.org/api/v1/lists/c945d6fe-929e-11e3-a2e9-12313d316c29/items/1efc3644-af25-4253-90b8-a0baf12dbd1e"
                    },
                    "osdi:list": {
                        "href": "https://osdi-sample-system.org/api/v1/lists/c945d6fe-929e-11e3-a2e9-12313d316c29"
                    },
                    "osdi:person": {
                        "href": "https://osdi-sample-system.org/api/v1/people/5d7d6534-cd24-466a-a698-4f684fa743f3"
                    }
                },
                "_embedded": {
                    "osdi:person": {
                        "_links": {
                            "self": {
                                "href": "https://osdi-sample-system.org/api/v1/people/5d7d6534-cd24-466a-a698-4f684fa743f3",
                                "title": "Christina Gonzalez"
                            }
                        },
                        "created_date": "2017-05-20T13:45:07Z",
                        "email_addresses": [
                            {
                                "address": "xtinag@sample.com",
                                "primary": true,
                                "status": "subscribed"
                            }
                        ],
                        "family_name": "Gonzalez",
                        "given_name": "Christina",
                        "identifiers": [
                            "osdi-sample-system:5d7d6534-cd24-466a-a698-4f684fa743f3"
                        ],
                        "modified_date": "2017-05-20T13:45:07Z",
                        "origin_system": "OSDI Sample System",
                        "postal_addresses": [
                            {
                                "address_lines": [
                                    "1200 18th Ave S"
                                ],
                                "locality": "Peoria",
                                "postal_code": "61601",
                                "primary": true,
                                "region": "IL"
                            }
                        ]
                    }
                }
            },
            //(truncated for brevity)
        ]
    }
}

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