Allow editing asset attributes in the UI

[Flix6x]

This PR adds an editable text field that can be used to update the asset's attributes by editing the full JSON string.

[coveralls]

Pull Request Test Coverage Report for Build 2926558069

• 13 of 18 (72.22%) changed or added relevant lines in 2 files are covered.
• 149 unchanged lines in 9 files lost coverage.
• Overall coverage increased (+0.2%) to 67.73%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
flexmeasures/ui/crud/assets.py	3	8	37.5%

Files with Coverage Reduction	New Missed Lines	%
flexmeasures/ui/crud/assets.py	1	74.18%
flexmeasures/data/models/planning/battery.py	2	94.19%
flexmeasures/data/services/scheduling.py	2	91.03%
flexmeasures/data/models/planning/solver.py	3	86.89%
flexmeasures/conftest.py	4	98.19%
flexmeasures/data/models/planning/charging_station.py	5	85.37%
flexmeasures/data/models/planning/utils.py	10	83.33%
flexmeasures/api/v3_0/sensors.py	28	70.26%
flexmeasures/cli/data_add.py	94	31.11%

Totals
Change from base Build 2825554854:	0.2%
Covered Lines:	7259
Relevant Lines:	10147

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💛 - Coveralls

[nhoening]

I think this needs a fix for validating the input.

Ideally, I'd ask for amending the test test_post_an_asset_with_invalid_data in api/v3_0/tests/test_assets_api.py to make sure this validation is working.

[nhoening]

Should this not raise a validation error, if content is non empty?

[nhoening]

I believe this line is a problem. I edited asset attributes with invalid JSON, which got accepted.

In the database, the asset's attributes are actually null now. Maybe this is due to this line, giving None if the input is not valid.

Now, loading the asset page fails:

  File "/home/nicolas/workspace/seita/flexmeasures/flexmeasures/ui/charts/latest_state.py", line 57, in get_latest_power_as_plot
    capacity_in_mw = sensor.get_attribute("capacity_in_mw", latest_power_value)
  File "/home/nicolas/workspace/seita/flexmeasures/flexmeasures/data/models/time_series.py", line 168, in get_attribute
    if attribute in self.generic_asset.attributes:
TypeError: argument of type 'NoneType' is not iterable

The CLI also fails to show the asset now:

  File "/home/nicolas/workspace/seita/flexmeasures/flexmeasures/cli/data_show.py", line 170, in show_generic_asset
    "".join([f"{k}:{v}\n" for k, v in asset.attributes.items()]),
AttributeError: 'NoneType' object has no attribute 'items'

[nhoening]

With this PR, we could add a note to the asset page's documentation, noting that one can now edit sensors_to_show and thus create a custom asset view.

Definitely right now a feature for more professional users. But it's there.

Wouldn't that tie together changes made for 0.11 nicely?

[Flix6x]

It would definitely be nice to include. I'm on it.