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Most of the rails plugins I found for a rails master slave setup seem to want to send all writes to the master and all reads to the slave.
This seems like a loss of resources to me. Is there a way to send reads to both master and slave, and writes only to the slave?
If this is a bad idea, why?
Think about what Master-Slave means.
A slave does not give the master orders as to what data it can take in.
If a master gives information to a slave, the slave can pass it on without bothering the master. The master can then concentrate on the job of acquiring information.
So, when you have a master-slave database, the master acquires data and passes it on to the slave(s) who can then pass it on to those requesting it.