ruby - Rails 5 - Simple Form - namespaced resources -

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i trying learn how use namespacing in rails 5 app.

i have resource called randd_fields.

the table in database called:

randd_fields

i have model.rb files with:

randd.rb

module randd   def self.table_name_prefix     'randd_'   end end  class randd::field < applicationrecord end

the controller called:

the views organised in files views/rannd/fields

in _form.html.erb, i'm trying find way form render.

i have tried each of these. 

<%= simple_form_for(@field), multipart: true |f| %> <%= simple_form_for(@randd, @field), multipart: true |f| %> <%= simple_form_for([:randd, @field]), multipart: true |f| %>

each of them gives error:

the first, gives error says: undefined method `model_name' nil:nilclass

the second 2 give error says:

syntax error, unexpected tlabel ...r([:randd, @field]), multipart: true |f| @output_buffer.s...

how can use new path namespaced resource?

my routes show:

rake routes | grep field                   import_randd_fields post     /randd/fields/import(.:format)                                          randd/fields#import                          randd_fields      /randd/fields(.:format)                                                 randd/fields#index                                       post     /randd/fields(.:format)                                                 randd/fields#create                       new_randd_field      /randd/fields/new(.:format)                                             randd/fields#new                      edit_randd_field      /randd/fields/:id/edit(.:format)                                        randd/fields#edit                           randd_field      /randd/fields/:id(.:format)                                             randd/fields#show                                       patch    /randd/fields/:id(.:format)                                             randd/fields#update                                       put      /randd/fields/:id(.:format)                                             randd/fields#update                                       delete   /randd/fields/:id(.:format)                                             randd/fields#destroy

i can't find way form render create new randd_field instance.

try following

<%= simple_form_for @field, multipart: true |f| %>

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