Select_tag with elasticsearch - ruby-on-rails

Question

I try to pass 2 options for search. First [:q] for input text by visitor and another one from model camping "nomdep" (like departement in english). When i try to search by input it's works, but since i try to add select_tag i have an error
ERROR
undefined method `map' for nil:NilClass
I m lost, do u have any ideas ?
Sorry for my english, i m french.
Home_controler.rb
def index
if params[:q].nil?
"Entrez un mot clef"
else
#campings = Camping.__elasticsearch__.search params[:q,:nomdep]
#camping = Camping.all
end
end
def result
if params[:q].nil?
#campings = []
else
#campings = Camping.__elasticsearch__.search(params[:q]).page(params[:page]).per(14).results
end
end
View
<div class="search">
<%= form_tag(result_path, method: :get) %>
<%= text_field_tag :q, params[:q], class:"search-query form-control" %>
<%= select_tag(:nomdep, options_for_select(#camping)) %>
<%= submit_tag "Partez", class:"btn btn-danger", name: nil %>
</div>
EDIT
Now i dont have any error but the search dont work if [:q] empty. So if i only select_tag => no result.
How fix this ?
My full home_controller.rb
class HomeController < ApplicationController
def index
#camping = Camping.all
if params[:q].nil?
"Entrez un mot clef"
else
#campings = Camping.__elasticsearch__.search params[:q, :nomdep]
end
end
def result
if params[:q].nil?
#campings = []
else
#campings = Camping.__elasticsearch__.search(params[:q]).page(params[:page]).per(14).results
end
end
end
my view
<div class="search">
<%= form_tag(result_path, method: :get) %>
<%= select_tag :nomdep, options_from_collection_for_select(#camping, :id, :nomdep), prompt: "Département" %>
<%= text_field_tag :q, params[:q], class:"search-query form-control" %>
<%= submit_tag "Partez", class:"btn btn-danger", name: nil %>
</div>

Answer 1

#camping = Camping.all
This variable will be nil unless :q was passed in params to index action. options_for_select(#camping) will attempt to call #map on this variable and raise error when it is not initialized.
You should make sure it is initialized. For example, try rewriting your action:
def index
#camping = Camping.all
if params[:q].nil?
"Entrez un mot clef"
else
#campings = Camping.__elasticsearch__.search params[:q]
end
end

Answer 2

I want to say a big big big THANKS to #Baradzed ! We talked yesterday and he find a solution thats work perfectly !
home_controller.rb
class HomeController < ApplicationController
def index
#camping = Departement.all
if params[:q].blank? || params[:nomdep].blank?
#campings = Camping.__elasticsearch__.search params[:nomdep]
else
#campings = Camping.__elasticsearch__.search params[:q]
end
end
def result
querystring = params.slice(:nomdep, :other_param, :any_params_except_q_because_we_will_process_q_separately)
.select{|k,v| v.present?}
.map {|key, value| "#{key}:\"#{value.gsub(/([#{Regexp.escape('\\+-&|!(){}[]^~*?:/')}])/, '\\\\\1') }\""}
.join(" AND ")
freetext = params[:q]
freetext.gsub!(/([#{Regexp.escape('\\+-&|!(){}[]^~*?:/')}])/, '\\\\\1')
querystring = ["*#{freetext}*",querystring].select{|v| v.present?}.join(" AND ") if params[:q].present?
if querystring.blank?
flash[:notice] = "Aucune mots clefs"
redirect_to action: :index and return
else
#campings = Camping.__elasticsearch__.search(
query: { query_string: {
query: querystring
}}).page(params[:page]).per(14).results
end
#hash = Gmaps4rails.build_markers(#campings) do |camping, marker|
marker.lat camping.latitude
marker.lng camping.longitude
marker.infowindow render_to_string(:partial => "/campings/infowindow", :locals => { :camping => camping})
marker.picture ({
"url" => "http://avantjetaisriche.com/map-pin.png",
"width" => 29,
"height" => 32})
end
end
end
view
<div class="search">
<%= form_tag(result_path, method: :get) %>
<%= select_tag :nomdep, options_from_collection_for_select(#camping, :nomdep, :nomdep), prompt: "Département" %>
<%= text_field_tag :q, params[:q], class:"search-query form-control" %>
<%= submit_tag "Partez", class:"btn btn-danger", name: nil %>