Ruby on Rails, two models in one form

Ruby on Rails, two models in one form

I have two very similar models Pretreatment and Diagnosis, that belong to the model Patient:

class Pretreatment < ActiveRecord::Base    belongs_to :patient    attr_accessible :content  end    class Diagnosis < ActiveRecord::Base    belongs_to :patient    attr_accessible :content  end    class Patient < ActiveRecord::Base    attr_accessible :age, :name, :city, :street, :number    has_many :anamneses    has_many :befunds  end  

On the Patient show page I'm displaying two forms, one for the Preatreatment and another for the Diagnosis:

<%= form_for([@patient, @patient.preatreatments.build]) do |f| %>    
      <%= f.label :conten %>
      <%= f.text_field :content %>    
    
      <%= f.submit %>    
  <% end %>    <%= form_for([@patient, @patient.diagnosiss.build]) do |f| %>    
      <%= f.label :content %>
      <%= f.text_field :content %>    
    
      <%= f.submit %>    
  <% end %>  

My question is how can I bring the two forms together, so that the user only has to press once the submit button? Im not sure but I think nested attributes is not the right thing to handle it, maybe thefields_for` tag?

Update I tried to use fields_for tag:

   <%= form_for([@patient, @patient.pretreatment.build]) do |f| %>       
         <%= f.label :content %>
         <%= f.text_field :content %>       
       <%= fields_for([@patient, @patient.diagnosiss.build]) do |u| %>       
         <%= u.label :content %>
         <%= u.text_field :content %>       
       <% end %>       
         <%= f.submit %>       
     <% end %>  

But I get the error:

undefined method `model_name' for Array:Class in <%= fields_for([@patient,@patient.befunds.build]) do |u| %>  

Answer by Sven Koschnicke for Ruby on Rails, two models in one form

You can use fields_for for the second model, which works like form_for but doesn't generate the form tags. See the docs.

Answer by Anand Soni for Ruby on Rails, two models in one form

There are some gems available for nested forms. one of them is awesome_nested_fields. I haven't used this earlier but that shows good code in documentation. Another one is simple_form.

Hope that helps!!!

Answer by Martin M for Ruby on Rails, two models in one form

Use fields_for for the associated models.
There should be no square brackets arround the parameters of fields_for

In your code example, I cannot find the relation between Patient and Diagnosis, and the plural of diagnosis is diagnoses, you can specify this in config/initializers/inflections.rb:

ActiveSupport::Inflector.inflections do |inflect|    inflect.irregular 'diagnosis','diagnoses'  end  

So your Patient model should contain

class Patient < ActiveRecord::Base    attr_accessible :age, :name, :city, :street, :number    has_many :diagnoses  end  

And you can write in your form:

 
     <%= f.label :content %>
     <%= f.text_field :content %>   
   <%= fields_for(@patient, @patient.diagnoses.build) do |u| %>   
     <%= u.label :content %>
     <%= u.text_field :content %>   
   <% end %>   
     <%= f.submit %>   
  

Answer by Muntasim for Ruby on Rails, two models in one form

You can achieve that using nested attributes :

patient.rb

class Patient < ActiveRecord::Base    attr_accessible :age, :name,  :pretreatments_attributes, :diagnosiss_attributes    has_many :pretreatments    has_many :diagnosiss      accepts_nested_attributes_for :pretreatments    accepts_nested_attributes_for :diagnosiss  end  

patients_controller.rb

def show      @patient = Patient.find(params[:id])      @patient.pretreatments.build      @patient.diagnosiss.build      respond_to do |format|        format.html # show.html.erb        format.json { render json: @patient }      end    end  

patients/show.html.erb:

<%= form_for @patient do  |f|%>      
Pretreatments:
        <%= f.fields_for :pretreatments do |field| %>          <%= field.label "Content" %>

<%= field.text_field :content %> <% end %>

Diagnosis:

<%= f.fields_for :diagnosiss do |field| %> <%= field.label "Content" %>