// character to ASCII value: use ?

   1  
   2  ?a     # => 97
   3  ?\n    # => 10

// string to integer: use []

   1  
   2  'a'[0]        # => 97
   3  'hallo'[1]    # => 97

// integer / number to character: use .chr

   1  
   2  97.chr     # => "a"
   3  10.chr     # => "\n"

//more info: "Ruby Cookbook", O'Reilly

// radio buttons generated with form helper
// selection by boolean
// attention interger numbers (0, 1) don't work

   1  
   2      <div class="row">
   3        <dl>
   4          <dt>Owner over 18?</dt>
   5          <dd>
   6          <%= radio_button( :guarantor, :over_eighteen.to_s, true )%> Yes &nbsp;&nbsp;
   7          <%= radio_button( :guarantor, :over_eighteen, false )%> No
   8          </dd>
   9        </dl>
  10      </div>

// camelize - from underscore_syntax to Uppercas/ClassSyntax
// constantize - create instance
// (params[:property]) -- read data from web-form

   1  
   2      @property = property_type.camelize.constantize.new(params[:property])

// in radrails when you import a project from subversion
// it is a normal project

// in the menu I found no way to transform it
// but so it worked for me:

// 1. edit the .project file and copy the natueres block

   1  
   2  	<natures>
   3  		<nature>org.radrails.rails.ui.railsnature</nature>
   4  		<nature>org.rubypeople.rdt.core.rubynature</nature>
   5  	</natures>

// 2. copy the buildSpec block too
// (I'm not sure if this is necessary, I did both and it worked)

   1  
   2  	<buildSpec>
   3  		<buildCommand>
   4  			<name>org.rubypeople.rdt.core.rubybuilder</name>
   5  			<arguments>
   6  			</arguments>
   7  		</buildCommand>
   8  	</buildSpec>

// 3. restart radrails and
// 4. add a webrick-server to the project
// and you are done

// find out the current url / uri in *.rhtml file
// is quite simple with the request object

   1  
   2  <% page = request.request_uri %>
   3  page: <%= page %>

// but then different urls mean the same page
// (../admin = ../admin/ = ../admin/index = ..admin/index/)
// and maybe the id is unwanted too (../admin/show/8)
// so below is an alternative with control on which parameter is used

   1  
   2  <% page = "/" + request.path_parameters['controller'] + "/" + request.path_parameters['action'] %>
   3  page: <%= page %>

// generate application

   1  
   2  rails projectname

// generate migration.

   1  
   2  ruby script/generate migration migration_name
   3  ruby script/generate migration add_price

// generate model
// we can give a list of columns and types
// :string, :text, :integer, :decimal, :float, :date, ...

   1  
   2  ruby script/generate model model_name
   3  ruby script/generate model user name:string hashed_password:string salt:string

// generate controller

   1  
   2  ruby script/generate controller controller_name method_name(s)
   3  ruby script/generate controller store index

// generate scaffold

   1  
   2  ruby script/generate scaffold model_name controller_name
   3  ruby script/generate scaffold product admin