Rails passing parameters between controller methods

Question

So I have 2 pages : Welcome & Details.

In the Welcome page, I'm asking the user to input their name and click on a button which takes you to details page. Creates an entry in db with the given name.

In the Details page, I'm asking for the age and gender. These details I'm updating in db against the name entered in the previous page.

Now, these are my two methods.

 def welcome
     @name = params[:name]
     if @fname
       then @record= Names.create({:name => @name})
     end
 end

 def details
     @human=Names.last
     @human.update_attributes({:age=> params[:age], :gender=> params[:gender]})
 end

Now, in the above code, instead of using Names.last, i want to use Names.find_by_id(name_id). But how do I pass the name_id value between these methods?

my suggestion is to go for nested_forms instead of going through this approach. railscasts.com/episodes/196-nested-model-form-revised has a good tutorial. — Rahul Dess
– Rahul Dess, Commented Nov 13, 2014 at 20:00
Why can't you do this in one form itself? If this is really necessary then you will have to post the view code for us to see what's going on. — Surya
– Surya, Commented Nov 13, 2014 at 20:04

dandlezzz · Accepted Answer · 2014-11-13 20:27:18Z

2

The easier way to do this, without relying on nested form is to put the id of the new record in the params of the detail get request. When the user clicks on details they need to go the details of their record.

So the route can include the id if you want something like names/:id/details.

your controller

def new    
 Names.create(params)
end

def edit
    @human = Names.find(params[:id])
    #whatever else
end

Without ajax you are pretty limited here. I can't produce the entire view code but if you have two views one that creates the new record and another that edits its details, you will be on the right track.

A more common pattern here would new/edit instead of new/details.

so in your routes file you just do resources :names. This will create the 7 restful routes. Read about it here, http://guides.rubyonrails.org/routing.html#singular-resources.

For your first day of rails you have the basics down, and following this pattern will help you a lot.

edited Nov 13, 2014 at 20:27

answered Nov 13, 2014 at 20:04

dandlezzz

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6 Comments

Rahul Dess Over a year ago

can you provide the snippet.

dandlezzz Over a year ago

snippet for the controller, the route or the view?

Pindub_Amateur Over a year ago

snippet for all 3 possibly. I understood what you're saying. But I'm not really sure how to do this. Its kind of my first day with rails.

dandlezzz Over a year ago

please green check me if you are satisfied with answer.

Pindub_Amateur Over a year ago

I think i understood most of it except - put the id of the new record in the params of the detail get request - How do I do this?

|

Anand · Accepted Answer · 2014-11-13 20:12:42Z

1

You could use a hidden_field in the welcome view form:

# views/.../welcome.html.erb
<%= form_for @user, action: :details, ...%>
  ...
  <%= f.hidden_field :name_id, value: @record.id %> 
<% end %>

# users_controller.rb
def details
  @human = Names.find(params[:name_id])
  ...
end

answered Nov 13, 2014 at 20:12

Anand

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Comments

Anwuna · Accepted Answer · 2014-11-13 21:20:22Z

1

There are several approaches to take in solving this problem but a fairly simple approach would be to pass the auto-generated id through a session variable e.g.

def welcome
    @name = params[:name]
    if @name 
       @record= Names.create({:name => @name})
       session[:id] =  @record.id
    end
end

def details
    @id = session[:id]
    @human = Names.find_by_id(@id)
end

answered Nov 13, 2014 at 21:20

Anwuna

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