Proper reversal of relations in sub queries - #171
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This is required to establish type symmetry as the base's methods also accept `NULL` to be able to direcly pass a getters return value to the appropriate setter.
Relations know it better how to and the override of `resolveFilter` in `BelongsToMany` proves it as it turned out that it is necessary to allow referencing the junction table in either the filter or the through filter in order to be able to better reverse relations.
Changes the way relations can be reversed drastically as it is now possible to influence the relation to use during reversal with `::setReverseName(string)` which allows Icinga DB Web to drop the error-prone `to.from` and `from.to` relations. An additional change is that it is now not mandatory anymore to define relations that are solely being required because of sub-queries. Missing relations on the reversed path are automatically registered. For this, each relation type now has its specific counterpart which is possible to override with `::setReverseClass(class-string)`. The default however, is to use the same type which is the case for `BelongsToOne` and `BelongsToMany`. For `BelongsTo` a sane override has been chosen that is based on how it's used at the moment in our products, as `HasOne` and `HasMany` may both be appropriate. But the latter clearly is used more often.
Since `::reverse()` uses the source's table alias by default as reverse name, a deprecation notice is triggered if the original forward path uses a different name, indicating that it is necessary to use this name as explicit reverse name. fixes #170
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Changes the way relations can be reversed drastically as it is now possible to influence the relation to use during reversal with
::setReverseName(string)which allows Icinga DB Web to drop the error-proneto.fromandfrom.torelations.An additional change is that it is now not mandatory anymore to define relations that are solely being required because of sub-queries. Missing relations on the reversed path are automatically registered. For this, each relation type now has its specific counterpart which is possible to override with
::setReverseClass(class-string). The default however, is to use the same type which is the case forBelongsToOneandBelongsToMany. ForBelongsToa sane override has been chosen that is based on how it's used at the moment in our products, asHasOneandHasManymay both be appropriate. But the latter clearly is used more often.Since
::reverse()uses the source's table alias by default as reverse name, a deprecation notice is triggered if the original forward path uses a different name, indicating that it is necessary to use this name as explicit reverse name.fixes #170