Summary:
This tightens down the set of referenced columns made available to
forms for dropdowns. Previous access to columns was computed at the
level of shared tables. Now it is calculated at the level of shared
sections. That means that we can now refrain from following hidden
references, and make the referred data unavailable to forms, since
they should not need it.
Test Plan: extended test
Reviewers: jarek, dsagal
Reviewed By: jarek, dsagal
Subscribers: dsagal
Differential Revision: https://phab.getgrist.com/D4234
Summary:
Shares and documents would both produce a rule set for the same column
if the document rule set was for multiple columns. In this case, it was causing
one of the rules to be overwritten by the other (specifically, the rule granting
access to form references was not being applied in shares). The symptom was
`null` values in place of the referenced table's values.
We address this by splitting any rule sets for multiple columns that are also
affected by shares, so that they can be overridden by shares without causing a
conflicting rule set to be created (i.e. 2 column rule sets containing the same column).
Test Plan: Server tests.
Reviewers: dsagal, paulfitz
Reviewed By: dsagal, paulfitz
Subscribers: dsagal
Differential Revision: https://phab.getgrist.com/D4208
