[Dbix-class] nullable column and might_have

Hartmaier Alexander alexander.hartmaier at t-systems.at
Thu Jun 5 12:15:39 GMT 2014

Hi Mitchell,
you've mistaken the direction of the relationship.
The result class with the xxxid column should have a belongs_to relationship to ForeignClass with { join_type => "LEFT" } so that rows where the xxxid column is NULL won't be missing from the resultset if you're joining the relationship.

In ForeignClass you could add a has_many relationship if you need it.

BR Alex

On 2014-06-05 13:54, Mitchell Elutovich wrote:
I have something like the following on a custom result source

  { data_type => "INT", default_value => undef, is_nullable => 1, size => 11 },

  { "foreign.id<http://foreign.id>" => "self.xxxid" },

I'm getting the warning:

DBIx::Class::Relationship::HasOne::_validate_has_one_condition(): "might_have/has_one" must not be on columns with is_nullable set to true (MyClass/xxxid). This might indicate an incorrect use of those relationship helpers instead of belongs_to. at ...

I don't understand why this for might_have might be incorrect, doesn't might_have imply it might be null?

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