need () for “not expression”

>> a=1
=> 1
>> not a
=> false
>> Rails.env.production?
=> false
>> Rails.env.development?
=> true
>> not Rails.env.development?
=> false
>> a && not Rails.env.production?
SyntaxError: compile error
(irb):6: syntax error, unexpected kNOT
a && not Rails.env.production?
^
from (irb):6
>> a && (not Rails.env.production?)
=> true
>> a && !Rails.env.production?
=> true

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