The previous commit (9fa9ef89) added support for the new SilverStripe 4
feature of Many Many relationships through an intermediary object. After
much head scratching and community testing, the solution was proven to
work, however had no automated tests to confirm as such. This commit
rectifies that by testing both versioned and unversioned DataObjects in
a many_many through style relationship. Some minor tidy and comments
were also added as per feedback on the functionality code changes.
Previously relationships defiend as many_many came in a special type
of RelationList - however now this can be one of two types of
RelationList depending on the type of definition, with both being
valid many_many relationships.
This had the unfortunate side effect of seeing the OrderableRows
component in (the least) cease functioning correctly. No longer.
This also has the fortunate bonus of allowing a many_many relationship to
be versioned; where previously while each item in the relationship could
be versioned, the relationship itself could not.
* Fixed GridFieldOrderableRows issue when data class is Versioned and relation is has_many
* just compare table names rather than updating existing getSortTable() func
* Fixed GridFieldOrderableRows issue when data class is Versioned and relation is has_many
* just compare table names rather than updating existing getSortTable() func
* Initialising button before attempting to enable or disable it
* Updating class reference
* Adding exception use case
* Removing unused use case
* Including Exception class for classes where exception is used.
