need one step deeper into a search and verify

rubyonrails-talk
1

hello all.

i have a model with a model called site.rb i have a method in it that will check to see if any of the options for this site has a pressure sensor.

def has_pressure_sensor?         self.site_options.any? {|option| option.option == 'pressure'} end

now, site belongs_to :group. i keep screwing up when i try to write a function that checks to see if any of the sites that belong to a group has the sensor.

i tried like this     @group.sites.each do |site|            site.has_pressure_sensor?

i was thinking that if any of the sites returned true, that i would have the true/false there. But it isn't working right.

any suggestions?

thanks sk

2

‘inject’ will do what you want here - your code would be:

@group.sites.inject(false) { | result, site | result || site.has_pressure_sensor? }

Note that this is somewhat optimized - once one site has returned true, has_pressure_sensor?

will not be evaluated for the remaining sites.

Hope this helps,

3

this is great, i will try it out. thanks sk

4

ok, i put it in and it didn't fail out, but it is evaluating true every time. Even if i select a site that does not have one. Is there something i am missing ? sk

5

oh wait, it is working, thanks Matt, for your help on this. sk