[code]records = YAML.load_file("myfile.yml")
records.each do |record|
puts record.inspect
end[/code]
I want to be able to read an arbitrary yml file, then print out each of
the element one by one.
In the above example, my output is
#<RmEnv label_label_id: 8, data_id: 27, data_val: "MJP-PR2">
#<RmEnv label_label_id: 8, data_id: 28, data_val: "MJP-QA2">
I know I can do
puts record.label_label_id
puts record.data_id
puts record.data_val
but that only works when reading myfile.yml. If reading other yml,
it''ll
be a different object.
I was hoping something like this would work
[code]
record.each do |key|
puts record[key]
end[/code]
But RoR throw an error, undefined method ''each'' for #<RmEnv
... >
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On Sep 17, 11:05 pm, John Do <rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:> [code]records = YAML.load_file("myfile.yml") > records.each do |record| > puts record.inspect > end[/code] > > I want to be able to read an arbitrary yml file, then print out each of > the element one by one. > > In the above example, my output is > #<RmEnv label_label_id: 8, data_id: 27, data_val: "MJP-PR2"> > #<RmEnv label_label_id: 8, data_id: 28, data_val: "MJP-QA2"> > > I know I can do > puts record.label_label_id > puts record.data_id > puts record.data_val > > but that only works when reading myfile.yml. If reading other yml, it''ll > be a different object. > > I was hoping something like this would work > [code] > record.each do |key| > puts record[key] > end[/code] > > But RoR throw an error, undefined method ''each'' for #<RmEnv ... >In the most general case there is not much you can do. While you can list all methods on an object, you can''t tell ahead of time whether these are just accessors or methods that do stuff. Methods might also be added only when needed (eg activerecord objects). You can dump the instance variables from the object, but it may not always be obvious which ones are important and which ones not. If you can make the assumption that all your object share some property (eg all descend from some base class etc...) then your life will be easier Fred (PS this is a pure ruby thing - no rails magic happening here) --~--~---------~--~----~------------~-------~--~----~ 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-/JYPxA39Uh5TLH3MbocFFw@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 -~----------~----~----~----~------~----~------~--~---
Frederick Cheung wrote:> On Sep 17, 11:05�pm, John Do <rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote: >> #<RmEnv label_label_id: 8, data_id: 28, data_val: "MJP-QA2"> >> [code] >> record.each do |key| >> � puts record[key] >> end[/code] >> >> But RoR throw an error, undefined method ''each'' for #<RmEnv ... > > > In the most general case there is not much you can do. While you can > list all methods on an object, you can''t tell ahead of time whether > these are just accessors or methods that do stuff. Methods might also > be added only when needed (eg activerecord objects). > You can dump the instance variables from the object, but it may not > always be obvious which ones are important and which ones not. > If you can make the assumption that all your object share some > property (eg all descend from some base class etc...) then your life > will be easier > > Fred (PS this is a pure ruby thing - no rails magic happening here)The #<blah key1: value1, key2: value2 ...> comes from YAML. There''s no way to pull out all the keys? I know if the yaml file doesn''t contains - !ruby/object:RmEnv, YAML.load will create a hash #<key1: value1, key2: value2 ...> which I can loop through with each_key. If it''s a ruby object, I''m out of luck? The data is just a database dump of a Rail Model RmEnv where keys are the db field and the values their values. -- 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-/JYPxA39Uh5TLH3MbocFFw@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 -~----------~----~----~----~------~----~------~--~---
On Sep 18, 6:19 pm, John Do <rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:> The #<blah key1: value1, key2: value2 ...> comes from YAML. There''s no > way to pull out all the keys? >Well you can certainly just dump instance variables from the object (which is probably what yaml does most of the time)> I know if the yaml file doesn''t contains - !ruby/object:RmEnv, YAML.load > will create a hash #<key1: value1, key2: value2 ...> which I can loop > through with each_key. > > If it''s a ruby object, I''m out of luck? >Not so much out of look, most objects just don''t have a way for iterating over all their properties (for whatever definition of properties they have)> The data is just a database dump of a Rail Model RmEnv where keys are > the db field and the values their values. >You might be better off dumping the attributes of your activerecord objects rather then the whole thing. Fred --~--~---------~--~----~------------~-------~--~----~ 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-/JYPxA39Uh5TLH3MbocFFw@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 -~----------~----~----~----~------~----~------~--~---
Frederick Cheung wrote:> On Sep 18, 6:19�pm, John Do <rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote: > >> The #<blah key1: value1, key2: value2 ...> comes from YAML. There''s no >> way to pull out all the keys? >> > Well you can certainly just dump instance variables from the object > (which is probably what yaml does most of the time) >How do you dump the instance variables from an object? Would you know of an online reference for what''s avaialable for object manipulation? -- 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-/JYPxA39Uh5TLH3MbocFFw@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 -~----------~----~----~----~------~----~------~--~---