Convert string into integer in rails - ruby-on-rails

Question

I'm creating a form_for in which one of the field fetches the drop-down list from the database. I'm interpolating the data to display the string but I want to store its id back into other database which is linked with my form.
class FlightsController < ApplicationController
def new
#flight = Flight.new
#airplane = #flight.airplane
#options = Airport.list
end
def create
#flight = Flight.new(flight_params)
if #flight.save!
flash[:success] = "Flight created successfully."
redirect_to #flight
else
flash[:danger] = "Flight not created."
redirect_to :new
end
end
private
def flight_params
params.require(:flight).permit(:name, :origin, :destination, :depart, :arrive, :fare, :airplane_id)
end
end
<%= form_for(#flight) do |f| %>
...
<div class="row">
<div class="form-group col-md-6">
<%= f.label :origin %>
<%= f.select :origin, grouped_options_for_select(#options), { include_blank: "Any", class: "form-control selectpicker", data: { "live-search": true } } %>
</div>
</div>
...
<% end %>
class Airport < ApplicationRecord
def self.list
grouped_list = {}
includes(:country).order("countries.name", :name).each do |a|
grouped_list[a.country.name] ||= [["#{a.country.iso} #{a.country.name}", a.country.iso]]
grouped_list[a.country.name] << ["#{a.iata} #{a.name} (#{a.city}, #{a.country.name})", a.id]
end
grouped_list
end
end
class Flight < ApplicationRecord
belongs_to :origin, class_name: "Airport"
belongs_to :destination, class_name: "Airport"
belongs_to :airplane
has_many :bookings, dependent: :destroy
has_many :passengers, through: :bookings
end
The following error is showing,
Airport(#69813853361360) expected, got "43" which is an instance of String(#47256130076180)
The output of Airport.list when run in a console is shown below:
=> {"India"=>[["IN India", "IN"], ["AGX Agatti Airport (Agatti, India)", 3], ["IXV Along Airport (Along, India)", 5], ["AML Aranmula International Airport (Aranmula, India)", 6], ["IXB Bagdogra International Airport (Siliguri, India)", 50]]}
Parameters: {"utf8"=>"✓", "authenticity_token"=>"+Z8+rkrJkkgaTznnwyTd/QjEoq3kR4ZmoUTp+EpM+320fNFg5rJm+Izx1zBODo/H7IIm3D+yg3ysnVUPmy7ZwQ==", "flight"=>{"name"=>"Indigo", "origin"=>"49", "destination"=>"11", "depart"=>"2019-02-21T21:30", "arrive"=>"2019-02-22T01:30", "fare"=>"2500", "airplane_id"=>"3"}, "commit"=>"Create Flight"}
I tried using to_i but it didn't work.

Answer 1

if you're interpolating a string with space delimiter you can try this.
'1 one'.split(' ').first.to_i

Answer 2

grouped_options_for_select is sending a.id as string value. Convert it to integer in your create action.
def create
#flight = Flight.new(flight_params)
#flight.origin = #flight.origin.to_i ## <== add this line
if #flight.save!
...

Answer 3

Convert string into integer in rails:
user_id = "123"
#user_id = user_id.to_i
puts #user_id
#user_id = 123
Convert integer into string in rails:
user_id = 456
#user_id = user_id.to_s
puts #user_id
#user_id = "456"
Convert column type string into integer in rails migration :
def change
change_column :webinars, :user_id, :integer, using: 'user_id::integer'
end
Convert column type integer into string in rails migration:
def change
change_column :webinars, :user_id, :string, using: 'user_id::string'
end

Answer 4

Your problem is not integer versus string, your problem is (and the error is telling you) the field is expecting an Airport object, but it's getting an airport id...
<%= f.select :origin, grouped_options_for_select(#options), { include_blank: "Any", class: "form-control selectpicker", data: { "live-search": true } } %>
You're trying to select origin which is an airport object. You really are just returning the ID of an airport object (origin_id).
Change it to
<%= f.select :origin_id, grouped_options_for_select(#options), { include_blank: "Any", class: "form-control selectpicker", data: { "live-search": true } } %><%= f.select :origin, grouped_options_for_select(#options), { include_blank: "Any", class: "form-control selectpicker", data: { "live-search": true } } %>
And don't forget to update your flight_params
def flight_params
params.require(:flight).permit(:name, :origin_id, :destination, :depart, :arrive, :fare, :airplane_id)
end
I would guess you'll have a similar problem with destination