m_edge
Access information about page connections.
Edges represent the connections between resources. They are
implemented as tuples {EdgeId, SubjectId, PredicateId, ObjectId,
OrderNr}. The edge id is a unique id representing the edge, it can
be used with edit actions. The OrderNr defines the order of the edges
with respect to the subject.
Most edge information is accessed using the m_rsc model, but some information can only accessed with the m_edge model.
This model implements two template accessible options. They are mainly used to obtain the edge’s id for edit pages.
The following m_edge model properties are available in templates:
| Property | Description | Example value |
|---|---|---|
| o | Returns a function that accepts a page id and a predicate. The end result is a
list of tuples {PageId, EdgeId} which
are objects of the page. Example
usage: |
[{204,13},{510,14},
{508,15}] |
| s | Identical to the “o” property, except that this function returns the subject edges. | |
| o_props | Similar to m.edge.o[id].author above, but
returns a property list for the edges instead of
the 2-tuple. |
[
{id, 86062},
{subject_id, 10635},
{predicate_id, 304},
{object_id, 57577},
{seq, 1},
{creator_id, 1},
{created, {
{2015,11,17},
{11,23,32}
}}
]
]
|
| s_props | Similar to m.edge.s[id].author above, but
returns a property list for the edges instead of
the 2-tuple. |
|
| edges | Returns a function that accepts a page
id. The end result is a list of edges per predicate
where the predicate is an atom and the edges are
property lists. Example usage: m.edge[10635] |
See example below. |
| id | Look up an edge id by a subject/predicate/object triple. Example usage: m.edge.id[subject_id].relation[object_id]
or: m.edge.id[subject_id][predicate_name][object_id]
Returns |
213 |
Example return value for {% print m.edge[10635] %}:
[{about,[[{id,86060},
{subject_id,10635},
{predicate_id,300},
{name,<<"about">>},
{object_id,17433},
{seq,1},
{created,{{2015,11,17},{11,22,11}}},
{creator_id,1}]]},
{author,[[{id,6},
{subject_id,10635},
{predicate_id,301},
{name,<<"author">>},
{object_id,10634},
{seq,1000000},
{created,{{2015,2,3},{16,23,20}}},
{creator_id,1}]]}]
Other Topics
model/edge/post/o/+subject/+predicate/+object or
model/edge/post/s/+object/+predicate/+object inserts a new edge between resources.
The posted message can optionally include the name or id of the object, predicate and subject.
cotonic.broker.publish("bridge/origin/edge/post/o/4312",
{
predicate: "author",
subject: 7575
});
It is also possible to insert edges via cotonics onclick topics.
<div data-onclick-topic="bridge/origin/model/edge/post/o/{{ id }}/?/{{ m.acl.user }}">
<button data-edge-predicate="is_going">Is Going</button>
<button data-edge-predicate="is_interested">Might Go</button>
</div>
When a user clicks on a button, the model retrieves the predicate name (or id) from the
data-edge-predicate attribute. This is also possible by for the object and subject attributes
of the edge. When there is a ? in the topic path, the value can be retrieved from a
data attribute. The attribute value for object is: data-edge-object. For subject it is:
data-edge-subject.
model/edge/post/delete/o/+subject/+predicate/+object,
model/edge/post/delete/s/+object/+predicate/+subject or
model/edge/post/delete/edge/+edge_id deletes the specified edge.
cotonic.broker.publish("bridge/origin/edge/delete/edge/6776");
Or via a onclick topic.
<button data-onclick-topic="bridge/origin/edge/delete/{{ edge_id }}">Delete</button