.byebug_history

exit
@lenses = Lense.where(:camera_type => nil)
@lenses
exit
!nil
nil
@lenses
bb
aa
exit
bb.empty?
aa.nil?
bb.nil?
cc
bb
aa
exit
b
a
exit
a.nil?
a
exit
eixt
b == ""
b == nil
a == nil
a.nil?
c.nil?
b.nil?
a
b
exit
!a.nil? && !b.nil?
!a.nil?
exit
a.nil? == false
a.nil?
a.nil? && b.nil?
b.nil?
exit
a.nil?
b != nil
b != 
a != nil
a == nil
nil == false
nil == true
a == false
a
a == true
a
exit
a
a || b
a&&b == true
a&&b
exit
lenses_params[:brandname]
c
b
a
c
b
a
exit
lenses_params[:name]
lenses_params
@lenses
exit
Lense.where(:name => "sony")
Lense.where(:name = "sony");
Lense.where(:name = "sony")
lenses_params[:name]
lenses_params[name]
lenses_params.first.last
lenses_params.first.first
lenses_params.first.frist
lenses_params.first.name
lenses_params.first
lenses_params.name
lenses_params
params.name
params
exit
params[:name]
exit
@lenses
continue!
continue
@lenses