How to add entry to Spectrum metadata

[vedina]

How to update the metadata of a spectrum instance ? @georgievgeorgi
This doesn't work .

spe.meta["sample"] = "smth"

[georgievgeorgi]

Spectrum.meta is a getter for Spectrum._metadata which is an instance of SpeMetadataModel which does not provide a setter. By design Spectrum for the most part should be immutable. By altering the metadata dictionary you will be violating this concept. With spe.meta = new_meta you may change the metadata with new dictionary which will be validated to SpeMetadataModel.
If for a reason you need to modify it in-place, you can do so with spe.meta.__root__['new_key'] = 'new_val'
You may define also a setter in SpeMetadataModel, which i discourage, as it makes it easy for the end user to alter the metadata and again brakes the concept of immutability of the Spectrum instances.

[vedina]

• the problem with metadata loaded from native files is that it is not standardized and is effectively useless.
• So if we want standardized metadata , we have to change what is read from the native files.
• besides, we need to add metadata of the sample, provider (e.g. organisation doing the experiment) , etc, which can not be retrieved from the native files
• what I do for uploading standardized metadata is adding a separate dataset directly in the h5file (bypassing the Spectrum class ) with standardized annotation as attributes, but it is not optimal