add monkey patch for joining with ONLY
keyword
#35
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it doesn't seem like there's a good way around the fact that currently
Arel
isn't flexible about how SQL JOIN strings get constructed regarding allowing theONLY
keyword to be conditionally appended. ideally one day Arel might support this, but for now we can monkey patch these methods. it doesn't feel great, but these methods have been stable for many years at this point.also includes a bit more noise regarding linting