isabella232 / mongo-diff

mongo-diff

Component to perform a diff between two objects expressed as MongoDB operations.

Example

var diff = require('mongo-diff');

// diff two arrays using set strategy
diff(['a', 'b', 'c'], ['b', 'c', 'a'])

/*
[
  ['pull', 'a'],
  ['push', 'a']
]
*/

Strategies

auto

diff('a', null)
// [['unset', 1]]

diff(1, 5)
// [['inc', 4]]

val(a, b)

diff.val('a', 'b')
// [['set', 'b']]

diff.val('a', null)
// [['unset', 1]]

Expresses differences as $set or $unset.

inc(a, b, opts)

diff.inc(5, 8, { interval: 1 })
// [['inc', 1], ['inc', 1], ['inc', 1]]

Options:

• interval increment interval. If null the interval defaults to the difference between the numbers (null)

Expresses differences between numbers in terms of $inc operations.

ordered_set(a, b)

diff.ordered_set([], ['a']);
// [['push', 'a']]

Expresses the difference between arrays as a series of $pull / $push operations. Useful to match differences on arrays that are used with the $addToSet MongoDB operation.

TODO

• More strategies
• Ordered set indexOf should use deep matching for object/array support