Deep merging¶
Contents
Deep merging is the algorithm used to merge user supplied data into a pattern’s source data. This algorithm enables us to only supply small parts of data to a pattern and have it render, instead of having to redeclare entire data structures.
Examples¶
We use JSON syntax since it more closely resembles Python data structures than YAML.
The simplest example completely replaces the source data:
source = {"foo": "bar"}
delta = {"foo": "moo"}
deepmerge(source, data)
...
{"foo": "moo"}
Adding one more key:
source = {"foo": "bar"}
delta = {"abc": "def"}
deepmerge(source, data)
...
{"foo": "bar", "abc": "def"}
Change key and add a key:
source = {"foo": "bar"}
delta = {"foo": "moo", "abc": "def"}
deepmerge(source, data)
...
{"foo": "moo", "abc": "def"}
