An entity is a specific instance of an EntityType that can exist in the knowledge graph. Entities typically represent real-world objects or locations such as a person, an organization, a building, or a vehicle. Each entity has a set of properties that is defined by the entity type it belongs to.
- See also
//create a new entity
require([
"esri/rest/knowledgeGraphService",
"esri/rest/knowledgeGraph/Entity",
], (knowledgeGraphModule, Entity) => {
const newEntity = new Entity({
typeName: "Supplier",
properties: {
Name: "Supplier 5",
EmployeeCount: 681
}
});
});
//searches for 'solar' in the properties of all entities in a knowledge graph
require([
"esri/rest/knowledgeGraphService"
], (KnowledgeGraphModule) => {
KnowledgeGraphModule
.executeSearch(kg, {
searchQuery: "solar",
typeCategoryFilter: "entity",
})
.then((queryResult) => {
// do something with the search results
console.log("Graph Search Result", queryResult);
});
});
//example of a return from the above search, printed to the console.
{
resultRows: [{
"declaredClass": "esri.rest.knowledgeGraph.Entity",
"properties": {
"shape": {
"declaredClass": "esri.geometry.Point",
"cache": {},
"hasM": false,
"hasZ": false,
"latitude": 53.589000000000009,
"longitude": -0.9633,
"type": "point",
"extent": null,
"spatialReference": {
"wkid": 4326
},
"x": -0.9633,
"y": 53.589000000000009
},
"Name": "Suncommon",
"Employee_Count": 400,
"energyType": "solar"
},
"typeName": "Company",
"id": ""{9D2D6AFD-41F1-49A4-8412-CACCC9906E88}","
}]
}
Constructors
-
new Entity(properties)
-
Parameterproperties Objectoptional
See the properties for a list of all the properties that may be passed into the constructor.
Example// create a new entity object const newEntity = new Entity({ typeName: "Supplier", properties: { Name: "Supplier 5", EmployeeCount: 681 } s});
Property Overview
Name | Type | Summary | Class |
---|---|---|---|
String | The name of the class. more details | Accessor | |
String | The unique ID of the object. more details | GraphNamedObject | |
Object | The properties of the graph object. more details | GraphObject | |
String | Specifies the name for all similar types of objects (entities or relationships) defined in the knowledge graph. more details | GraphNamedObject |
Property Details
-
The name of the class. The declared class name is formatted as
esri.folder.className
.
-
The unique ID of the object.
-
The properties of the graph object. For entities and relationships the properties are specified by its entity type or relationship type. The values of the properties are specific to the object.
Examples//example of properties structure that includes geometry "properties": { "shape": { "declaredClass": "esri.geometry.Point", "cache": {}, "hasM": false, "hasZ": false, "latitude": 53.589000000000009, "longitude": -0.9633, "type": "point", "extent": null, "spatialReference": { "wkid": 4326 }, "x": -0.9633, "y": 53.589000000000009 }, "Name": "Suncommon", "Employee_Count": 400, "Address": "123 Broadway, New York, New York", "EnergyType": "solar" }
//two entities of different entity types with different properties [{ "declaredClass": "esri.rest.knowledgeGraph.Entity", "properties": { "Name": "Suncommon", "Employee_Count": 400, "energyType": "solar" }, "typeName": "Company", "id": "1256" }, { "declaredClass": "esri.rest.knowledgeGraph.Entity", "properties": { "Name": "Empire State Building", "height": 1454, "heightUnits": "feet", "city": "New York" }, "typeName": "Building", "id": "B7889541" }]
//two relationships of different relationship types with different properties [{ "declaredClass": "esri.rest.Relationship.Relationship", "properties": { "start_date": "2020-04-17", "employee_id": "4589", "office": "152 Building A" }, "typeName": "Employed_by", "id": "B7889541" }, { "declaredClass": "esri.rest.Relationship.Relationship", "properties": { "quantity": 125000, "frequency": "bi-weekly", "contact_person": "Betty White" }, "typeName": "buys_part", "id": "B7889541" }]
-
Specifies the name for all similar types of objects (entities or relationships) defined in the knowledge graph. For example, all 'employee' entities in a knowledge graph of an organization might have the typeName 'employee'.
Method Overview
Name | Return Type | Summary | Class |
---|---|---|---|
Adds one or more handles which are to be tied to the lifecycle of the object. more details | Accessor | ||
Boolean | Returns true if a named group of handles exist. more details | Accessor | |
Removes a group of handles owned by the object. more details | Accessor |
Method Details
-
addHandles(handleOrHandles, groupKey)inherited
-
Adds one or more handles which are to be tied to the lifecycle of the object. The handles will be removed when the object is destroyed.
// Manually manage handles const handle = reactiveUtils.when( () => !view.updating, () => { wkidSelect.disabled = false; }, { once: true } ); this.addHandles(handle); // Destroy the object this.destroy();
ParametershandleOrHandles WatchHandle|WatchHandle[]Handles marked for removal once the object is destroyed.
groupKey *optionalKey identifying the group to which the handles should be added. All the handles in the group can later be removed with Accessor.removeHandles(). If no key is provided the handles are added to a default group.
-
Returns true if a named group of handles exist.
ParametergroupKey *optionalA group key.
ReturnsType Description Boolean Returns true
if a named group of handles exist.Example// Remove a named group of handles if they exist. if (obj.hasHandles("watch-view-updates")) { obj.removeHandles("watch-view-updates"); }
-
removeHandles(groupKey)inherited
-
Removes a group of handles owned by the object.
ParametergroupKey *optionalA group key or an array or collection of group keys to remove.
Exampleobj.removeHandles(); // removes handles from default group obj.removeHandles("handle-group"); obj.removeHandles("other-handle-group");