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Created Deprecated: Message properties overriding node properties (markdown)

anna2130 2014-11-03 05:29:57 -08:00
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Deprecated:-Message-properties-overriding-node-properties.md Normal file

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Properties can be set in a node or in an incoming message to define behaviour.
For example, when using a file node, either setting 'Filename' in the node or setting `msg.filename` in an incoming message will read from that file. If both properties are set `msg.filename` will currently override the node property.
This behaviour is only found in some nodes and can have unexpected consequences as described in this [issue](https://github.com/node-red/node-red/issues/399). Therefore, message overriding has been deprecated. In future nodes and future releases `msg.some_property` will only be used if the property is not set in the node. Nodes currently using the override functionality will continue to function in this release but will also receive a warning noting that this behaviour is deprecated.
The core nodes and properties affected by this behaviour are:
* **http request:** `msg.url` and `msg.method`
* **email:** `msg.to`
* **file:** `msg.filename`