m_edge¶
- Module: core
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}]]}]