Example:

TableOne
  many_to_one :table_two, key: [:col_1, :col_2, :col_3], primary_key: 
[:col_1, :col_2, :col_3]
end

TableTwo
  one_to_many :table_ones, key: [:col_1, :col_2, :col_3], primary_key: 
[:col_1, :col_2, :col_3]
end

Now, presuming these line up:

t1 = TableOne.first
t1.table_two => nil
t1.table_two_dataset.first => <instance of TableTwo>

This behavior only seems to happen when one of the columns is null. And the 
behavior is true if I attempt the association in the other direction.

Is this behavior intended or am I missing something? The only way I could 
replicate it was a null key. (In my real life problem, the key in both 
tables had a foreign key constraint on a third table that is optionally 
null.)

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