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Make note of list indexing in Hocon.md

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Ryan O'Neill 2015-05-04 14:43:49 -07:00
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@ -1025,6 +1025,19 @@ Then the `${x}` in "foo.conf", which has been fixed up to
`${a.x}`, would evaluate to `42` rather than to `10`. `${a.x}`, would evaluate to `42` rather than to `10`.
Substitution happens _after_ parsing the whole configuration. Substitution happens _after_ parsing the whole configuration.
Includes inside of lists use the list index as a path segment when
fixing up substitutions.
Example:
{
a : [ { include "foo.conf" } ]
a.0.x : 42
}
Since the `${x}` in "foo.conf" would be fixed up to `${a.0.x}' we
get our expected value of 42.
However, there are plenty of cases where the included file might However, there are plenty of cases where the included file might
intend to refer to the application's root config. For example, to intend to refer to the application's root config. For example, to
get a value from a system property or from the reference get a value from a system property or from the reference