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edge_delete.rst

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Example

Perform some action when an edge is deleted:

-include_lib("zotonic_core/include/zotonic.hrl").
-export([observe_edge_delete/2]).

observe_edge_delete(#edge_delete{edge_id = Id}, Context) ->
    %% Consult the edge_log table to get the late edge's details
    Edge = z_db:assoc_row("select * from edge_log where edge_id = $1", [Id], Context)),

    ?DEBUG(Edge),
    %% logged is when the deletion was logged; created is when the edge was
    %% originally created
    %% [{id,11},{op,<<"DELETE">>},{edge_id,25},{subject_id,341},{predicate_id,300},{predicate,<<"about">>},{object_id,338},{seq,1000000},{logged,{{2016,10,13},{10,23,21}}},{created,{{2016,10,13},{10,23,13}}}]

    %% Do something...

    ok.