Using interpolated strings is it possible to call multiple #{} within each other?
For example I want to create a variable and add a number onto the end. I also want to attach a result from a column in site, but also increment the number as well. What the best method of doing the below code?
@site.each do |site|
1.upto(4) do |i|
eval("@var#{i} = #{site.site_#{i}_location}", b)
end
end
So @var1 = site.site_1_location, @var2 = site.site_2_location, etc.
Mocking @sites data:
@sites = [OpenStruct.new(
site_1_location: 'Japan',
site_2_location: 'India',
site_3_location: 'Chile',
site_4_location: 'Singapore'
)]
You can use instance_variable_set to set the instance variable
@sites.each do |site|
1.upto(4) do |i|
instance_variable_set("@var#{i}", site.send("site_#{i}_location"))
end
end
Now you can access the variables:
@var1 # returns "Japan"
@var2 # returns "India"
@var3 # returns "Chile"
@var4 # returns "Singapore"
Using #send might help
code = "@var#{i} = site.send(:site_#{i}_location)"
eval(code)
Yes of cause, nesting of #{} is possible.
Stupid example, but it shows the possibilties of nesting:
x = 1
y = 2
"abc_#{"#{x}_#{y if y > 1}"}"
# => 'abc_1_2'
Never the less, the solution for your code, suggested by Imram Ahmad (https://stackoverflow.com/a/66002619/14485176) is the better aproach to solve your problem!
