Thanks Reza. After test Rie's Script Vs Reza's Script in my Lab.This is the
Result :
[-Reza-]
Group.find(:all).map(&:users).map(&:email)
Tested and Work Well As Expected
[-Rie-]
Group.find(:all).map { |g| g.users.map(&:email) }
Tested and Not Work Yet, The Same Error still comes.
Btw I want to ask Baby Question, What is meaning of " &: " in range of your
script?
Thank You,
Disconnect
Riand[FX]
Reza Primardiansyah <[EMAIL PROTECTED]> wrote:
That's weird Riand, g.users should return Enumerable
instead of User object.
First thing come in mind, Rie, is
Group.find(:all).map(&:users).map(&:email)
Am I wrong ?
--- Booking Heaven <[EMAIL PROTECTED]> wrote:
> NOT work at me, i did same things like you. And at
> Group.find(:all).map { |g| g.users.map(&:email) }
> it says :
> NoMethodError: undefined method 'map' for
> #<User:0x47d4d18>
>
> I am using Rails 1.2.3 & Ruby 1.8.5 & OS XP.
>
> Disconnect
> Riand[FX]
>
> Rie! <[EMAIL PROTECTED]> wrote:
> ;)) Look at the last line, that's
> the solution
>
> $ script/console
> Loading development environment (Rails 2.0.2)
> >> Group.count
> => 1
> >> User.count
> => 2
> >> Group.find(:all).map(&:users.map(&:email))
> NoMethodError: undefined method `map' for
> :users:Symbol
> from (irb):3
> >> Group.find(:all).map(&:(users.map(&:email)))
> SyntaxError: compile error
> (irb):4: syntax error, unexpected '(', expecting
> tSTRING_CONTENT or
> tSTRING_DBEG or tSTRING_DVAR or tSTRING_END
> Group.find(:all).map(&:(users.map(&:email)))
> ^
> (irb):4: syntax error, unexpected ')', expecting
> $end
> Group.find(:all).map(&:(users.map(&:email)))
> ^
> from (irb):4
> >> Group.find(:all).map(&:{users.map(&:email)})
> SyntaxError: compile error
> (irb):5: syntax error, unexpected tLBRACE,
> expecting tSTRING_CONTENT
> or tSTRING_DBEG or tSTRING_DVAR or tSTRING_END
> Group.find(:all).map(&:{users.map(&:email)})
> ^
> (irb):5: odd number list for Hash
> Group.find(:all).map(&:{users.map(&:email)})
> ^
> (irb):5: syntax error, unexpected ')', expecting
> $end
> from (irb):5
> >> Group.find(:all).map(&:"users.map(&:email)")
> NoMethodError: undefined method
> `users.map(&:email)' for #<Group:0x1f57a84>
> from
>
/Users/arie/RealProjects/xxx.com/vendor/rails/activerecord/lib/active_record/attribute_methods.rb:206:in
> `method_missing'
> from
>
/Users/arie/RealProjects/xxx.com/vendor/rails/activerecord/lib/../../activesupport/lib/active_support/core_ext/symbol.rb:11:in
> `__send__'
> from
>
/Users/arie/RealProjects/xxx.com/vendor/rails/activerecord/lib/../../activesupport/lib/active_support/core_ext/symbol.rb:11:in
> `to_proc'
> from (irb):6:in `map'
> from (irb):6
> >> Group.find(:all).map { |g| g.users.map(&:email)
> }
> => [["[EMAIL PROTECTED]"]]
> >>
>
> also be careful of def object end duck typing,
> remember to put it
> inside parentheses, ex. (def object end).method
>
> --
> r9 = { name: Rie!, ym: riyari3, skype: rubyninja,
> li: http://linkedin.com/in/ariekeren,
> fb: http://profile.to/ariekeren,
> blog: http://tinyurl.com/2bjgvn }
>
>
>
>
>
> ---------------------------------
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