Hi,
i have a "place" model with 2 columns (id, name).
I''m calling an external api which gives me data to create a new place
object.
I would like to add the address from the external place to the place
object and render it as a json result, without storing it in the
database.
i don''t get any errors, but the address never shows up within the json
output. i''ve tried with attr_accessor but that didn''t work
either.
any hints?
thanks
=========================================place.rb
class Place < ActiveRecord::Base
attr_accessor: address
end
=========================================places_controller.rb
external_api_place_data = @client.find(place_id)
place = Place.new
place.name = place.name
place.id = place.id
//not showing up in the json result
place.address = external_api_place_data.address
places = []
places << place
respond_to do |format|
format.html # index.html.erb
format.json { render json: places }
end
=========================================
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On 25 Oct 2011, at 14:03, "Lukas M." <lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:> Hi, > i have a "place" model with 2 columns (id, name). > I''m calling an external api which gives me data to create a new place > object. > > I would like to add the address from the external place to the place > object and render it as a json result, without storing it in the > database. > > i don''t get any errors, but the address never shows up within the json > output. i''ve tried with attr_accessor but that didn''t work either.foo.to_json(:methods => [:attr1, :attr2]) Maybe? (assuming that foo.attr1 returns one of your extra attributes) Fred.> > any hints? > > thanks > > > =========================================> place.rb > > class Place < ActiveRecord::Base > attr_accessor: address > end > > =========================================> places_controller.rb > > external_api_place_data = @client.find(place_id) > place = Place.new > place.name = place.name > place.id = place.id > > //not showing up in the json result > place.address = external_api_place_data.address > > places = [] > places << place > > respond_to do |format| > format.html # index.html.erb > format.json { render json: places } > end > > > > =========================================> > -- > 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. >-- 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.
hi, that works but not in the case when i would like to do something like this: user_place = Location.new(:place => place, :user => user) user_place.to_json //address is missing -- 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.
I think for Rails to recognize that the attribute should be included, you need to use attr_accessible rather than the Ruby method attr_accessor. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To view this discussion on the web visit https://groups.google.com/d/msg/rubyonrails-talk/-/K5aXBvoKXwcJ. 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.
hm.. no luck with that either. when i try to print out the places object in the console (logger.debug @place.to_yaml), "address" is missing. -- 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.
On 25 Oct 2011, at 16:00, "Lukas M." <lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:> hm.. no luck with that either. when i try to print out the places object > in the console (logger.debug @place.to_yaml), "address" is missing.For json at least you could override the as_json method to add the attributes you want. Fred> > -- > 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. >-- 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 Tue, Oct 25, 2011 at 5:00 PM, Lukas M. <lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:> hm.. no luck with that either. when i try to print out the places object > in the console (logger.debug @place.to_yaml), "address" is missing. >From the top of my head (not hard tested now). Now you refer to to_yaml, in previous mails, you refered to to_json. Be careful, there is a fundamental difference between to_xml, to_json, to_yaml on ActiveRecord ... One of them (I believe to_yaml) prints the "raw" database column values, even if you overwrite that accessor function with a name. The other two (to_json, to_xml IIRC) use the attribute accessors (from ActiveRecord I presume), that can be overwritten by your own code. So, I would expect to_yaml to never work in this scenario (where there is no database column). But to_json should be possible in this scenario (I did some simple tests with ActiveModel and that seemed to work as expected). HTH, Peter -- 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.
One alternative in terms of dynamically adding an attribute to a model instance (without having to have pre-defined any attr_... in the class): ... place = Place.new place.name = place.name place.id = place.id place[''address''] = external_api_place_data.address ... From then on, for that instance, you can call place.address, and it will show up in place.to_json (since to_json is generated from place.attributes, which now has a k/v for address in attributes). Jeff On Oct 25, 8:16 am, Frederick Cheung <frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> On 25 Oct 2011, at 16:00, "Lukas M." <li...-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote: > > > hm.. no luck with that either. when i try to print out the places object > > in the console (logger.debug @place.to_yaml), "address" is missing. > > For json at least you could override the as_json method to add the attributes you want. > > Fred > > > > > > > > > > > -- > > Posted viahttp://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 athttp://groups.google.com/group/rubyonrails-talk?hl=en.-- 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.