Passing parameters to transactions

Arbitrary parameters can be passed to transactions by setting the params attribute when declaring the transaction. This feature is handy to re-use thesame transaction code for multiple calls but with different parameters.

A basic example:

db._executeTransaction({
  collections: { },
  action: function (params) {
    return params[1];
  },
  params: [ 1, 2, 3 ]
});

The above example will return 2.

Some example that uses collections:

db._executeTransaction({
  collections: { 
    write: "users",
    read: [ "c1", "c2" ]
  },
  action: function (params) {
    var db = require('@arangodb').db;
    var doc = db.c1.document(params['c1Key']);
    db.users.save(doc);
    doc = db.c2.document(params['c2Key']);
    db.users.save(doc);
  },
  params: { 
    c1Key: "foo", 
    c2Key: "bar" 
  }
});