Searching using hubSearch(...)

Within Hub.js the main search function is hubSearch, which uses an IQuery to defined the critera to be applied, and an IHubSearchOptions for paging, number and authentication information.

This guide will review how to construct the query, and the search options.

Note If you are searching for specific Hub Entities, the entity "manager" modules also have search functions

Building a Query

The IQuery interface is used to express both simple and extremely very complex structures.

A query must declare the target entity type. This is needed so the query can be routed to the correct backing api.

Entity Type	Description and backing API end-point
item	ArcGIS Portal Item /sharing/rest/search
group	ArcGIS Portal Group /sharing/rest/community/groups/search
user	ArcGIS Portal User /sharing/rest/portal/self/users

These entities are not currently implemented

Entity Type	Description and backing API end-point
groupMember	ArcGIS Portal Group Users /sharing/rest/community/groups/{id}/userlist
event	ArcGIS Hub Event
post	ArcGIS Hub Discussion Posts

Query, Filters, Predicates

A Query contains 1 or more Filters, which contain 1 or more Predicates.

When the query structure is serialized into an API request the following logic is applied:

Within a Query...

• all Filters are ANDed together
• all Predicates within a Filter use the filer.operation to control how they are connected

{
  "entityType": "item",
  "filters": [
    {
      "operation": "AND",
      "predicates": [
        {
          "group": "3ef"
        }
      ]
    }
    {
      "operation": "OR",
      "predicates": [
        {
          "type": "Web Map"
        },
        {
          "type": "Hub Site"
        }
      ]
    }
  ]
}

Reads as:

• Search for items,
  • in group "3ef" AND
  • type = "Web Map" OR type = "Hub Site"

We can also express this more concisely as:

{
  "entityType": "item",
  "filters": [
    {
      "operation": "AND",
      "predicates": [
        {
          // Properties within a predicate are AND'ed unless
          // an `IMatchOptions` structure is used, which allows
          // more precise control
          "group": "3ef",
          "type": {
            "any": ["Web Map", "Hub Site"]
          }
        }
      ]
    }
  ]
}

In this example we see that a property on an IPredicate can be a string, or an IMatchOptions

Using MatchOptions

As noted above, most predicate properties will work with a IMatchOptions structure, which allows more specificity with how the query is serialized for the backing API.

{
  "entityType": "item",
  "filters": [
    {
      "operation": "AND",
      "predicates": [
        {
          "type": "Feature Service",
          "tag": {
            "all": ["authoritative"],
            "any": ["water", "lake"],
            "not": ["rivers"]
          }
        }
      ]
    }
  ]
}

This reads as:

• search for items
  • of type Feature Service
  • tag authoritative
  • AND tag water or lake
  • WITHOUT tag rivers

We can combine predicates via the .operation to construct more complex queries

{
  "entityType": "item",
  "filters": [
    {
      "operation": "OR",
      "predicates": [
        {
          "type": "Feature Service",
          "tag": {
            "all": ["authoritative"],
            "any": ["water", "lake"],
            "not": ["rivers"]
          }
        },
        {
          "type": "Web Map",
          "tag": {
            "all": ["authoritative"],
            "any": ["wildfire", "fire"]
          },
          "owner": "jsmith"
        }
      ]
    }
  ]
}

This reads as:

• search for items
  • of type Feature Service
  • tag authoritative
  • AND tag water or lake
  • WITHOUT tag rivers
  • OR
  • of type Web Map
  • tag authoritative
  • AND tag wildfire or fire
  • owned by jsmith

Predicate Properties

Although the IPredicate structure allows for any key, value combinations, the following table lists the properties and their allowed types, for queries being serialized to the ArcGIS Portal API.

Property	Entity	Allowed Types
access	item, group, user	string, string[], IMatchOptions
categories	item	string, string[], IMatchOptions
created	item, group, user	IDateRange<number> IRelativeDate
description	item, group	string, string[], IMatchOptions
disabled	user	boolean
email	user	string, string[], IMatchOptions
emailstatus	user	string, string[], IMatchOptions
firstname	user	string, string[], IMatchOptions
fullname	user	string, string[], IMatchOptions
group	item, user	string, string[], IMatchOptions
id	item, group	string, string[], IMatchOptions
isInvitationOnly	group	boolean
isopendata	group	boolean
joined	group	IDateRange<number> IRelativeDate
lastlogin	user	IDateRange<number> IRelativeDate
lastname	user	string, string[], IMatchOptions
memberType	group	string, string[], IMatchOptions
modified	item, group	IDateRange<number> IRelativeDate
orgid	item, group	string, string[], IMatchOptions
owner	item, group	string, string[], IMatchOptions
provider	user	string, string[], IMatchOptions
role	user	string, string[], IMatchOptions
searchUserAccess	groupMember	"member"
searchUserName	groupMember	string
snippet	item	string, string[], IMatchOptions
tags	item,group	string, string[], IMatchOptions
term	item, group, user	string, string[], IMatchOptions
type	item	string, string[], IMatchOptions
typekeywords	item, group	string, string[], IMatchOptions
userlicensetype	user	string, string[], IMatchOptions
username	user	string, string[], IMatchOptions