server side programming, using the Ruby on Rails (RoR) framework help please

rubyonrails-talk
1

Hello ,

I have a home work shown below i did most of the things , i wrote rthml and database in netbeans but i cant run

Homework and code i wrote are below what is missing here i dont know please help . I cant run it

Implement a WEB application using the RAILS framework for maintaining an online directory on hotels. Each entry in the directory will have the following fields:

hotel name city year built "star" classification (how many stars, integer) home many rooms pool (yes/no) You will need to create a database using the meta-data given above in either MYSQL, POSTRESQL or some other database system that is familiar to you. The table can be created either using SQL and the interface of your database system, or from within RoR, using migrations.

The operations that should be implemented are:

Create a new hotel Delete a hotel Show all hotels Find an entry by hotel name and display it Find and display hotels which have pools

Include pictures of hotels in the database and show them also.

RB FILE

class Assignment < ActiveRecord::Migration   def self.up   create_table : Hotels do |t|   t.coloumn : hotel_name, :string   t.coloumn : city, :string   t.coloumn : yearbuilt, :int   t.coloumn : star, :int   t.coloumn : numofrooms, :int   t.coloumn : pool, :string   end

  Hotel.create : hotel_name => "Anatolia Beach Hotel" , city =>"Kemer",   yearbuilt =>"2004",star=>"5",numofrooms=>"1200",pool=>"yes"

  Hotel.create : hotel_name => "Catamaran Resort" , city =>"Fethiye",   yearbuilt =>"2006",star=>"5",numofrooms=>"860",pool=>"yes"

  Hotel.create : hotel_name => "Oasis Beach Club" , city =>"Kas",   yearbuilt =>"2001",star=>"7",numofrooms=>"3600",pool=>"yes"

  Hotel.create : hotel_name => "Dedeman" , city =>"Cesme",   yearbuilt =>"2003",star=>"5",numofrooms=>"450",pool=>"yes"

  end

  def self.down   drop_table : hotels   end end

class Assignment < ApplicationController   def alllist   @hotels = Hotel.find(:all)   end end

RHTML

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http:// www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml&quot;&gt; <head> <html xmlns="http://www.w3.org/1999/xhtml&quot;&gt;

<head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>List of Hotels</title> </head>

<body> <%for Hotel in @Hotels %> <li><%=Hotel.hotel_name %> </li> <%end%> </body> </html>

2

Hello ,

Hello!

I have a home work shown below

Homework and code i wrote are below what is missing here i dont know please help . I cant run it

Well, I'm not prepared to *do* your homework for you; if you pass the course, and use the qualification to get a job, I doubt you'll be sending me the pay cheque! I would *assume* that you've been given all the info in your class to complete the homework, so I will help you out with some of the obvious problems so you can get it working yourself.

class Assignment < ActiveRecord::Migration def self.up create_table : Hotels do |t|

There's two issues here. First, there shouldn't be a space after the colon, and the name of the table should be with a lower case "H". So:    create_table :hotels do |t|

   t\.coloumn : hotel\_name, :string

You've misspelt "column" in all the rows, and again, there shouldn't be any spaces after the colons.

   Hotel\.create : hotel\_name =&gt; &quot;Anatolia Beach Hotel&quot; , city =&gt;&quot;Kemer&quot;,
   yearbuilt =&gt;&quot;2004&quot;,star=&gt;&quot;5&quot;,numofrooms=&gt;&quot;1200&quot;,pool=&gt;&quot;yes&quot;

There *should* be colons in front of those hash-keys (and again, there shouldn't be a space after the colon). Also, you've created the fields :yearbuilt, :star and :numofrooms as integers in the DB, but you're assigning them as strings - Rails might sort that one for you, but better to be correct to begin with. So:   Hotel.create :hotel_name => "Anatolia Beach Hotel" , :city =>"Kemer",   :yearbuilt =>2004, :star=>5,numofrooms=>1200, :pool=>"yes"

<body> <%for Hotel in @Hotels %> <li><%=Hotel.hotel_name %> </li> <%end%> </body> </html>

There are some conventions in Ruby/Rails about naming objects, and one is that if a name begins with a capital letter it is a constant. So best not to name the variable in the loop "Hotel" (especially since that's the class of the object too (although you've not pasted any model code.... but you do have a "hotel.rb" file right?). Also, your instance varable is named "@hotel" in the controller, but you're accessing "@Hotel" here, so you would find out that the loop won't do anything, because @Hotel is nil. BTW, a more "Ruby" loop is to use an iterator instead of a for...each (but that's really a personal preference):   <% @hotels.each do |hotel| %>    <li><%= hotel.hotel_name %> </li>   <% end %>

That's a few issues that jump out of the code at me, and I guess there may be one or two more. But if you sort them out and try it again, it might run a little further.

The next thing I suggest for you is a two-pronged attack: Firstly, when you come back and post your next message, give us some more information about *what you did*, and *what happened*. Saying "I cant run it" doesn't give us much to go on, but if you say "I tried 'rake db:migrate' on my Ubuntu machine, and got a message that the db can't be found. How do I tell Rails about my db location?" we can answer more accurately.

Secondly, for your own personal development I would suggest concentrating a little more on the details - give it a little more attention. I spotted all those problems above with one look through your code; and I'm *sure* that if you had thought about it, you could have solved a few of them yourself :slight_smile: The Rails framework is an excellent tool, but like any tool you need to know how to use it properly to get the best results from it. Looking at the code, I guess you didn't use Rails generators to create a scaffolded application for you... it might be worth doing a quick Google, and approaching it that way, as the majority of the hard work will be done for you.

But keep plodding through your problems one at a time, and eventually they all go, and you'll be left with lovely working code :slight_smile: