On 08/13/2015 05:23 PM, Guyren Howe wrote:
It surprises me that no SQL database to my knowledge has polymorphic joins as a
first-class feature.
A polymorphic join is where a fk contains not just an id but an indicator of
which table it refers to.
I am pretty sure it already does that:
http://www.postgresql.org/docs/9.4/interactive/sql-createtable.html
REFERENCES reftable [ ( refcolumn ) ]
So you could have a "tags" table, that can attach tags to any of a
variety of other tables. Rails handles this by including the table name
as a string.
This seems a reasonable thing to want to do, and it seems that the database
could handle it by combining the fields from the target tables in the result.
I also think migrations ought to be a first-class feature…
So is this the push the ORM into the database day?
--
Adrian Klaver
adrian.kla...@aklaver.com
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