Hi there,
I''m newbie here and I have a problem with the connection with MongoDB.
The connection among Rails and MongoDB works, but I don''t know, how to
print only one "column" from document.
If I''m trying following a part of code:
puts db["testCollection"].find_one().inspect
So I''will get the entire structure of BSON, as:
{"_id"=>#<BSON::ObjectID:0x118576c ...>,
"name"=>"MongoDB",
"info"=>{"x"=>203, "y"=>102},
"type"=>"database", "count"=>1}
But I would like to ask you, how is possible to get only the item eg
"name"... I am searching this information a long time, but no result
yet...
I will very glad for everything help, thanks a lot!
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On Thu, Mar 3, 2011 at 4:41 PM, Manny 777 <lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:> The connection among Rails and MongoDB works, but I don''t know, how to > print only one "column" from document. > > puts db["testCollection"].find_one().inspect > > So I''will get the entire structure of BSON, as: > > {"_id"=>#<BSON::ObjectID:0x118576c ...>, "name"=>"MongoDB", > "info"=>{"x"=>203, "y"=>102}, "type"=>"database", "count"=>1} > > But I would like to ask you, how is possible to get only the item eg > "name"... I am searching this information a long time, but no result > yet...db["testCollection"].find_one[''name''] Hint: `db["testCollection"].find_one.methods.sort` will give you a lot of useful information... -- Hassan Schroeder ------------------------ hassan.schroeder-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org twitter: @hassan -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
Hi Hassan,
thanks for your reply.
This works, but if I am trying to select only one attribut from the
whole document,
db["testCollection"].find[''name'']
so that isn''t working. I must to type:
@array=db.collection(''people'').find() #I''m selecting
everything :/
i=0
for polozka in @array
puts "#{i}th item is: #{polozka[''name'']}"
i+=1
end
Can you help with this? Thanks in advance!
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On Fri, Mar 4, 2011 at 10:30 AM, Manny 777 <lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:> Hi Hassan, > thanks for your reply. > > This works, but if I am trying to select only one attribut from the > whole document, > > db["testCollection"].find[''name''] > > so that isn''t working. I must to type: > > @array=db.collection(''people'').find() #I''m selecting everything :/ > i=0 > for polozka in @array > puts "#{i}th item is: #{polozka[''name'']}" > i+=1 > end > > Can you help with this? Thanks in advance! >I think you will find that this will work better. It will return an array of just the people''s names and then you can iterate over them. arr_person = Person.find(:all).map {|p| p.name} arr_person.each_with_index{|p,i| puts "#{i} has the name: #{p}"} B. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
On Fri, Mar 4, 2011 at 8:30 AM, Manny 777 <lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:> This works, but if I am trying to select only one attribut from the > whole document,I''m not sure if you''re trying to get only documents with a given name or show the names of all documents, but have you gone through this: <http://api.mongodb.org/ruby/current/file.TUTORIAL.html> It will probably give you a good overall picture. HTH! -- Hassan Schroeder ------------------------ hassan.schroeder-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org twitter: @hassan -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
On Fri, Mar 4, 2011 at 8:54 AM, Bryan Crossland <bacrossland-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> I think you will find that this will work better. It will return an array of > just the people''s names and then you can iterate over them. > > arr_person = Person.find(:all).map {|p| p.name}It would if the OP were using ActiveRecord with a Person object, but the question is about MongoDB :-) db.collection(''people'').find().each_with_index { |x,y| puts "#{y} #{x[''name'']}" } would actually work... -- Hassan Schroeder ------------------------ hassan.schroeder-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org twitter: @hassan -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
Simple blog built with MongoDB http://rad-sample.heroku.com sources https://github.com/alexeypetrushin/rad_sample -- Posted via http://www.ruby-forum.com/. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
More examples: Save any pure Ruby object (also complex & nested) in MongoDB https://github.com/alexeypetrushin/mongo_db + driver API enhancements (100% backward-compatible with original API), makes API more friendly & handy, no extra abstraction or complexities introduced, all things are exactly the same as in MongoDB. -- Posted via http://www.ruby-forum.com/. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.