Ruby on Rails

On Apr 27, 2014, at 6:53 AM, Walter Lee Davis <waltd@wdstudio.com> wrote:

> I believe this is correct behavior. A float is not precise for any definition of that term.

A float is precise for many values, in particular any integer < 2^52 - 1 for 64-bit float values.

So the 3 most pertinent questions to OP are:

- Why the heck would you use a float as an id???

- What range of ids do you expect to use: min, max, and whether or not with fractional parts? (And if you will be using fractions, do you understand the rounding issues well enough to guarantee that for a given id, you will always provide the same float value?)

- Float is 64-bit on PostgreSQL. Is it 64 bit or 32 bit on MySQL? (Because if it's only 32 bit, then 29,312,000 is well out of the range which can be represented exactly.)

--
Scott Ribe
scott_ribe@elevated-dev.com
http://www.elevated-dev.com/
(303) 722-0567 voice




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