simple_form rails 4、设置自动关联

Question

is a little project and I try to associate patient model with consultations. one patient has_many :consultations, in my form I have:

<%= f.association :patient %>

I pass the id parameter from the patient to the action 'new' in this way:

<%= link_to new_consultum_path(:id => @patient.id) %>

And in the view I have:

1. How can I make that the f.association field take the correspondent patient_id automatically?

2. How can I be sure that the patient_id is the current patient?

3. If I want to hide this field is that ok if I put

   instead of

4. Is a better way to do this?

5. And why in the view shows me # patient:0x007f4e7c32cbd0 ?

thanks for your help.

Answer 1

And why in the view shows me # patient:0x007f4e7c32cbd0

This is a Patient object .

It means you need to call an attribute of this object - EG @patient.name .

--

f.association field take the correspondent patient_id automatically

This might help:

It looks like Organization model doesn't have any of these fields: [ :to_label , :name , :title , :to_s ] so SimpleForm can't detect a default label and value methods for collection. I think you should pass it manually.

#app/models/patient.rb
class Patient < ActiveRecord::Base
   def to_label 
      "#{name}"
   end
end

Apparently, you need to have either title , name or to_label methods in your model in order for f.association to populate the data.

-

How can I be sure that the patient_id is the current patient?

If you're having to verify this, it suggests inconsistencies with your code's structure. If you need the patient_id to be set as the current patient , surely you could set it in the controller:

#app/controllers/consultations_controller.rb
class ConultationsController < ApplicationController
   def create
      @consultation = Constultation.new
      @consultation.patient = current_patient
      @consultation.save
   end
end

I can provide more context if required.

Answer 2

You want to associate consultations to patients using fields_for, which is similar to form_for, but does not build the form tags.

It you start with your patient object, you can iterate through the consultation associations binding it to form fields as you go.

it would look something like this

<%= form_for @patient do |patient_form| %>
    <% patient_form.text_field :any_attribute_on_patient %>
    <% @patient.consultations.each do |consultation| %>
        <%= patient_form.fields_for consultation do |consultation_fields| %>
            <% consultation_fields.text_field :any_attribute_on_consulatation %>
        <% end %>         
    <% end %>
<% end %>

Sorry, the code may not be exactly right.

Check out the docs for field_for here

You will also have to set accepts_nested_attributes_for consultations on patient. When you set accepts_nested_forms_for, Rails will automatically update the associated consultations object to the patient and save any edits you have made. You DEFINITELY want to use accepts_nested_attributes_for most nested form handling of this type.