Import data into the same parameter value

[manuelma]

Often, we want to build a single time series or a map using data from several files/sheets. This is impossible at the moment, but it could be achieved by defining multiple mappings with the same parameter value as target. When running the importer, the data from the different mappings would be merged into the single parameter value.

What is possible at the moment is to merge data comming from an importer into data currently existing in the database, so maybe we can repurpose part of that functionality to achieve what I propose? Will give it a try now.

[manuelma]

This is done and working, but we need two more things:

• Make it more consistent. At the moment there is some ambiguity between merging into the DB or into the 'on-the-fly' mapped data.
• Make sure that writing mappings one by one doesn't conflict with writing in the right order for referential integrity.