Articles form Satish Chauhan's Ruby on Rails blog

How to install web server on ubuntu

satish — Thu, 08 May 2008 12:50:29 GMT

Here is the step-by-step procedure to install apache web server on your machine 
install apache
<pre>
satish@satish-laptop:~$ sudo apt-get install apache2
</pre>test it 
surf to your own server on your own local computer:
<pre>
satish@satish-laptop:~$ firefox "http://localhost"
</pre>
find out how your server is found on the net. anyone can use your ip address or dns name to connect to your server:
<pre>
satish@satish-laptop:~$ ip addr
=>1.2.3.4
</pre>use your own ip address (eth0, first ip number, does not end .255)
<pre>
satish@satish-laptop:~$ fi...

Bar camp delhi 3

satish — Mon, 10 Dec 2007 05:46:04 GMT

Saturday (7th dec, 2007) i was at barcampdelhi3 held in impetus technologies, noida

this was my first barcamp and i enjoyed this very much

to find more details about the event, sessions held <a href='http://barcamp.org/barcampdelhi3'>click here</a>

How to load selective fixtures to db in rails

satish — Wed, 17 Oct 2007 13:13:55 GMT

All of you know how to load fixture to db

<pre>rake db:fixtures:load</pre>

to load a subset of your fixtures to your projects db

<pre>rake db:fixtures:load fixtures=users,stores</pre>

Star rating in ruby on rails

satish — Wed, 17 Oct 2007 13:07:51 GMT

Recently i needed to implement star rating system for one of my project i am working on.

if you are not familiar with a star rating system, its simply a method of voting using (usually) 5 stars in a row, which will change colour as you hover over them indicating the level at which to rate something. you may think a simple rollover would accomplish this but difficulty arises because as you rollover each star it should stay highlighted while you light up the next one and so on until the end of the row of stars.

if this doesnt make much sense to you then take a look at what we are going ...

How to paginate with ajax

satish — Wed, 17 Oct 2007 13:04:52 GMT

Pagination is a very common task in web application development. but sometimes we need to paginate something with ajax request. the interest to use ajax for this is to provide a dynamic interface which doesn’t need to reload the entire page when next results(page) displayed. ajax is really nicely integrated with rails, and using it is very easier with this great framework. to work with ajax requests your browser must be enabled to handled java script requests. i knew two methods for that problem.

first method

your controller code

<pre>
def ajax_pagination_lin...

How to use syntaxhighlighter

satish — Wed, 17 Oct 2007 13:10:05 GMT

syntaxhighlighter:

syntaxhighlighter is a source code syntax highlighting plugin to help a developer/coder to post code snippets online with ease and and without having to worry about applying format. it is a free javascript tool for source code syntex highlighting , it doesn’t care what you have on your server.

the idea behind syntaxhighlighter is to allow insertion of colored code snippets on a web page without relying on any server side scripts.

wp-dp.syntaxhighlighter supported languages:
<ul>
<li>c# </li>
<li>css </li>
<li>c++ </li>
<li>vb & vb.net </li>
<li>delph...

Varify email address format

satish — Wed, 17 Oct 2007 13:03:53 GMT

Multiple checkboxes with habtm

satish — Wed, 17 Oct 2007 13:03:03 GMT

Has and belongs to many with multiple check boxes

so if you are trying to do a multiple select of checkboxes and using habtm in your project, but when you submit the form, only one value was available in your controller. while you try to edit records in database but because of some error you get back to the pre field form and you found that the checkboxes checked by you gone ,then here’s the solution

model:

<pre>
class customer < activerecord::base
has_and_belongs_to_many :intrests
end
</pre>

controller code:

<pre>
class customerscontroller <...

How to import csv file in rails

satish — Wed, 17 Oct 2007 13:02:20 GMT

How to import csv file in rails?

the csv text-file format is a common choice for both import and export when performing data migrations. what if you want to import csv files within a rails application?

here is the code that allow you to upload csv data onto the mysql database from the web interface
this code save data direct to database without saving it to temp file

controller:

<pre>
require ‘csv’

def csv_import
@parsed_file=csv::reader.parse(params[:dump][:file])
n=0
@parsed_file.each do |row|
c=customerinformation.new
c.job...

How to generate csv files in rails

satish — Thu, 18 Oct 2007 04:17:33 GMT

The csv text-file format is a common choice for both import and export when performing data migrations. what if you want to generate csv files from the database records and want to export within a rails application?

here is the code that allow you to generate csv file form the database records
 
controller: 
<pre>
require 'csv'

def export_to_csv
@customers=customerinformation.find(:all)
report = stringio.new
csv::writer.generate(report, ',') do |title|
title << ['id','job title','first name','last name']
@customers.each do |c|
...