Hi everyone,
My problem involves two tables, Objects and Attributes:
Objects
-------------
|ID
|Name
-------------
Attributes
-------------
|ID
|Object_ID (foreign key references Objects.id)
|Value
-------------
I want to be able to search for Objects by (potentially many)
combinations of Attribute values. To show all of the unique Objects
that have Attributes ''green'' AND
''colorless'', I am currently writing
this mess of code:
SELECT DISTINCT objects.*
FROM attributes t1, attributes t2, objects
WHERE t1.val = ''green''
AND t2.val = ''colorless''
AND t1.object_id = t2.object_id
AND t1.object_id = objects.id
Is there a way I can search make queries like (''Show me all of the
records that have ALL of these attributes'') and just feed it a list of
attributes?
The technique I am using requires that I make a new table alias for each
new attribute. Does rails have some built-in join mechanism to do
queries like this?
Thanks in advance,
Dustin
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