Rails 3 - Make a “link_to” using selected value from collection select

[Angelo Cordova]

Hello everyone.

I have a form in my ruby 1.9.2 rails 3.0.9 app, and one of the fields
is a "collection select" like this

<div class="field">
<%= f.label :provider_id, "Provider" %>
<%= collection_select( :purchase_document, :provider_id,
Provider.all, :id, :name) %>
</div>

The idea, is to be able to add a "link_to" using the selected value
from the "collection select" i.e.:

<div class="field">
<%= f.label :provider_id, "Provider" %>
<%= collection_select( :purchase_document, :provider_id,
Provider.all, :id, :name) %> <%= link_to "Show",
provider_path(***selected option from collection select***)%>

But, I don't know how to get the selected value. Is there a rails way
to do that?

Hope you can help me, thanks

[Walter Lee Davis]

There's two ways to do this, which one you choose depends on what stage you want the choice to be made in. If you want to submit a form to the controller, and then have the controller redirect based on the value of that select, you could do something like this (post to a "redirect" method):

def redirect
@provider = Provider.find(:whatever_your_model_is[:provider_id]])
redirect_to @provider
end

If you want this redirect to happen in the browser, without touching the server, then you would just observe the change event on the picker, and redirect based on that.

document.observe('dom:loaded', function(){
$('whatever_your_model_is_provider_id').observe('change', function(evt){
if(!!$F(this)){
window.location.href = '/providers/' + $F(this);
}
});
});

Walter

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[Angelo Cordova]

Great!!!

Thanks for your help

[yash shah]

Dear Sir,
I have a similar issue. Here is my code:

<h1>Add New Investment Opportunity</h1>
 
<%= form_for Investopp.new do |f| %>
 
<div class="field">
    <%= f.label :state_id %><br/>
    <%= f.collection_select  :state_id, Investopp.year_lookup(@state_ids), :label, :value, include_blank: true %>
</div>

<div class="field">
    <%= f.label :city_id, "city" %><br />
    <%= f.grouped_collection_select :city_id, Investopp.year_lookup(@state_ids), :cities, :value, :id,:name, include_blank: true %>
  </div>
<% end %>
<%= link_to 'Back', investopps_path %>
<%= link_to 'Search', investopps_browsedisplay_path %>

Here is the model(investopp):

class Investopp < ActiveRecord::Base
  attr_accessible :Address, :Buildingname, :Desiredinvrole, :Details, :Prefferednoofinvestors, :Salesprice, :Weblisting, :photo, :user_id, :state_id, :city_id, :state, :city
 
  has_attached_file :photo, :styles => { :small => "200x200>" }
  belongs_to :user
  validates :Buildingname, presence: true
  validates :Address, presence: true
  validates :Desiredinvrole, presence: true
  validates :Weblisting, presence: true
  validates :Details, presence: true
  has_many :states
  has_many :cities
  def find_state(id)
      if !id  || id==0
          id=1
      end

      @states= State.find(id)
      @states.name

  end
  def find_city(id)
      if !id  || id==0
          id=1
      end

      @cities= City.find(id)
      @cities.name

  end

def self.year_lookup(state_ids)
 
#create an emptycollection to hold the LabelValue Objects
years = []
 
state_ids.each do |yr| y = LabelValue.new()
y.label = yr
y.value = State.find_by_id(yr).name
years.push(y)
end

years

end

def self.state_lookup(state_ids)
years = []
 
state_ids.each do |yr| y = State.new()
 y= State.find_by_id(yr)
years.push(y)
end

years

end 
 
end

class LabelValue
# name the accessors. Label and Value
attr_accessor :label, :value


def cities
  cityids=[]
  state_cities=[]
  

  investopps=Investopp.find(:all)
  investopps.each do |i|
    puts i.city_id
    cityids <<i.city_id
  end
  cityids.uniq!
 
  states=State.find_by_id(label)
  cityids.each do |c|
 if states.cities.find_by_id(c)
  state_cities<< states.cities.find_by_id(c)  
end

  end

  state_cities
end
 
 end

Here is the controller:

class InvestoppsController < ApplicationController
  # GET /investopps
  # GET /investopps.json
  def index
    @investopps = Investopp.where(:user_id => current_user.id)

    respond_to do |format|
      format.html # index.html.erb
      format.json { render json: @investopps }
    end
  end

 

  # GET /investopps/1
  # GET /investopps/1.json
  def show

    @investopp = current_user.investopps.find(params[:id])
 
    respond_to do |format|
      format.html # show.html.erb
      format.json { render json: @investopp }
    end
  end

  
  # GET /investopps/new
  # GET /investopps/new.json
  def new
    @investopp = Investopp.new

    respond_to do |format|
      format.html # new.html.erb
      format.json { render json: @investopp }
    end
  end

  # GET /investopps/1/edit
  def edit
    @investopp = Investopp.find(params[:id])
  end

  # POST /investopps
  # POST /investopps.json
  def create

#params[:investopp][:state_id]= "gopi"
#params[:investopp][:city_id]= "33" 
    @investopp = current_user.investopps.build(params[:investopp])
   
    respond_to do |format|
      if @investopp.save
        format.html { redirect_to @investopp, notice: 'Investopp was successfully created.' }
        format.json { render json: @investopp, status: :created, location: @investopp }
      else
        format.html { render action: "new" }
        format.json { render json: @investopp.errors, status: :unprocessable_entity }
      end
    end
  end

  # PUT /investopps/1
  # PUT /investopps/1.json
  def update
    @investopp = Investopp.find(params[:id])

    respond_to do |format|
      if @investopp.update_attributes(params[:investopp])
        format.html { redirect_to @investopp, notice: 'Investopp was successfully updated.' }
        format.json { head :no_content }
      else
        format.html { render action: "edit" }
        format.json { render json: @investopp.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /investopps/1
  # DELETE /investopps/1.json
  def destroy
    @investopp = Investopp.find(params[:id])
    @investopp.destroy

    respond_to do |format|
      format.html { redirect_to investopps_url }
      format.json { head :no_content }
    end
  end


  def lis
    @state_names=[]
    @state_ids=[]
    @city_ids= []
    @city_names=[]
    @investopp = Investopp.find(:all)
    @investopp.each do |item|
      @state_names<< State.find_by_id(item.state_id).name
      @state_ids<< item.state_id
      @city_names<< City.find_by_id(item.city_id).name
      @city_ids << item.city_id
    end
    puts  @state_ids.uniq!{|i| i}
    puts  @city_ids.uniq!{|i| i}
   
    puts "gopi"
    respond_to do |format|
      format.html { render "investopps/lis", :locals => { :state_ids => @state_ids, :city_ids => @city_ids, :investopps =>  @investopp } }
      format.json { render json: @investopp }
    end
  end

def redirect
  @state = State.find(:investopp [:id])
  redirect_to @state
end
 
end


My aim is to display the selected value from the drop down list on the other page. I tried applying the redirect method in the controller but I am not able to display the selected value.
Please help. I am stucked up badly. Thanks in advance.

[Colin Law]

On 27 July 2013 02:06, yash shah <yashsh...@gmail.com> wrote:
> Dear Sir,
> I have a similar issue. Here is my code:

Much TLDR. Also you replied to a thread that is two years old, so any
comments there may well be out of date. Start a new thread, explain
exactly what your problem is (one problem only in a posting otherwise
the thread will get confusing) and post just the relevant section of
code that you cannot get to work. Try to get the post down to around
20 lines total and you will have a good chance of someone reading it
and trying to help.

Colin