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The content’s structure is scattered into Knowledge Nodes. Knowledge Nodes are the second objects to instantiate while setting up your content on our API.\\

{{:api2:knowledge_structure:graph.jpg?400|graph}}

===Object resources===

^ Property     ^ Type      ^ Description         ^
| id | Integer | identifier for the database of Domoscio's API |
| knowledge_graph_id | Integer | The knowledge graph this knowledge node belongs to |
| name | String | Custom data |
| uid | String | The ID of this knowledge node in your Database |
| created_at | DateTime | Date of creation of the object |
| updated_at | DateTime | Last time the object has been modified |

===Create (POST)===

^ Method | POST |
^ URL | /knowledge_nodes |

==Parameters (*Requiered parameters)==

^ Property     ^ Type      ^ Description         ^
| knowledge_graph_id* | Integer | The knowledge graph this knowledge node belongs to |
| name | String | Custom data |
| uid | String | The ID of this knowledge node in your Database. Useful if you cannot store the ID returned by the API |

==Send the request (JSON input example)==

<code>
{
	knowledge_graph_id: 856,
	name: "Financial asset",
	uid: "fin01"
}
</code>

==Get the response (JSON output example)==

<code>
{
    "name": "Financial asset",
    "knowledge_graph_id": 856,
    "id": 3170,
    "created_at": "2017-11-22T15:24:15.098Z",
    "updated_at": "2017-11-22T15:24:15.098Z",
    "uid": "fin1",
    "difficulty": 1
}
</code>

===Fetch (GET)===

^ Method | GET |
^ URL | /knowledge_nodes/{knowledge_node_id} |

If no knowledge_node_id is provided you can use the following parameters to filter only some knowledge nodes.\\

^ Property     ^ Type      ^ Description         ^
| knowledge_graph_id | Integer | The knowledge graph this knowledge node belongs to |
| uid | String | The ID of this knowledge node in your Database. Useful if you cannot store the ID returned by the API |

==Get the response (JSON output example)==

**With ID provided**\\

<code>
{
    "id": 3170,
    "knowledge_graph_id": 856,
    "created_at": "2017-11-22T15:24:15.098Z",
    "updated_at": "2017-11-22T15:24:15.098Z",
    "uid": "fin02",
    "name": "Financial asset2",
    "difficulty": 1
}
</code>


**Without ID provided**\\
<code>
[
    {
        "id": 2714,
        "knowledge_graph_id": 782,
        "name": "1_1",
        "uid": null,
        "created_at": "2017-09-20T14:35:38.663Z",
        "updated_at": "2017-11-20T09:53:10.116Z",
        "difficulty": 1.2
    },
    {
        "id": 3169,
        "knowledge_graph_id": 856,
        "name": "Financial asset",
        "uid": "fin01",
        "created_at": "2017-11-22T15:13:34.162Z",
        "updated_at": "2017-11-22T15:13:34.162Z",
        "difficulty": 1
    },
    {
        "id": 3170,
        "knowledge_graph_id": 856,
        "name": "Financial asset2",
        "uid": "fin02",
        "created_at": "2017-11-22T15:24:15.098Z",
        "updated_at": "2017-11-22T15:24:15.098Z",
        "difficulty": 1
    }
]
</code>

===Fetch all Knowledge Nodes by Knowledge Graph===

You can get all Knowledge Nodes relative to a given Knowledge Graph.

^ Method | GET |
^ URL | /v2/knowledge_graphs/{knowledge_graph_id}/knowledge_nodes |

===EDIT (PUT)===

^ Method | PUT |
^ URL | /v2/knowledge_nodes/{knowledge_node_id} |

==Editable parameters==

^ Property ^ Type ^ Description/expected values |
| name | String | Custom data (<255 chars) |
| uid | String | Custom data (<255 chars) |

==Send the request (JSON input example)==

<code>
{
	name: "No more Financial asset",
	uid: "nofin2"
}
</code>

==Get the response (JSON output example)==

<code>
{
    "id": 3170,
    "knowledge_graph_id": 856,
    "created_at": "2017-11-22T15:24:15.098Z",
    "updated_at": "2017-11-22T15:42:56.878Z",
    "name": "No more Financial asset",
    "uid": "nofin2",
    "difficulty": 1
}
</code>
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