My contribution to the increasing entropy, and eventual heat death of the universe
Once you have the kernel built for peripheral mode, getting the gumstix to emulate a serial port is pretty straight forward, just load the g_serial module. This will create a device called /dev/ttyGS0.
modprobe g_serial cat /dev/random > /dev/ttyGS0
I could get about 3.5 Kilobytes a second over the link.
You can also use g_multi to get serial and mass storage at the same time:
modprobe g_multi file=/file_store_data
Some notes on deploying my rails application in to a subdirectory. I’m using rvm to manage Rails versions and this was all on Debian Lenny.
1. Install Rails (see here for some pointers).
2. Install Passenger
gem install passenger apt-get install apache2-prefork-dev apt-get install libapr1-dev apt-get install libaprutil1-dev passenger-install-apache2-module
Follow the instructions passenger gives you.
3. Edit your apache config
3.1 Create a symlink to your app’s public directory inside your current website root:
(in this example my app is call nihongo)
ln -s /PATH/TO/WEBAPP/nihongo/public /PATH/TO/YOUR/DOCROOT/nihongo
3.1 Edit your apache config for this root to contain a pointer to this app:
RackBaseURI /nihongo <Directory /PATH/TO/YOUR/DOCROOT/nihongo> Options -MultiViews </Directory>
4. Checkout your app…
Possibly use rake db:setup to setup the database. Use “bundle install” to install required bundle files.
Use…
rake assets:precompile
to “compile” assets, or you may get an error such as:
Completed 500 Internal Server Error in 518ms
ActionView::Template::Error (application.css isn't precompiled):
2: <html>
3: <head>
4: <title>Nihongo</title>
5: <%= stylesheet_link_tag "application" %>
6: <%= javascript_include_tag "application" %>
7: <%= csrf_meta_tags %>
8: </head>
app/views/layouts/application.html.erb:5:in `_app_views_layouts_application_html_erb___2940450108335557336_39013520'
app/controllers/words_controller.rb:8:in `index'
I don’t quite understand how Rails detects the app is running in production yet. But it does so automatically somehow…
My first attempt is here. However that lacked a search box. It was neat in that you could reference the search directly as http://blah/blah/searchstring. However that’s not really what we want, as we want to use search forms and such….
So attempt 2.
First add routes for 2 net methods to routes.rb:
resources :words do
collection do
get 'dosearch'
get 'search'
end
end
I then added 2 new methods to the appropriate controller:
def search
@words = Word.where("word = ?",params[:id]) #all #find(params[:id])
respond_to do |format|
format.html # search.html.erb
format.json { render json: @words }
end
end
def dosearch
@word = ""
respond_to do |format|
format.html
format.json { render json: word }
end
end
The first method is as before, and performs the search. The second method really just returns the search html. Perhaps I shouldn’t be using a method for this at all? Just some static html?
Then I added a dosearch.html.erb which will render the search form:
<h1>Search for word</h1> <%= render 'searchform' %> <%= link_to 'Back', words_path %>
And a _searchform.html.erb which /actually/ renders the form:
%= form_tag("/words/search", :method => "get") do %>
<%= label_tag(:q, "Search for:") %>
<%= text_field_tag(:id) %>
<%= submit_tag("Search") %>
<% end %>
Next I added a search.html.erb for the search results:
<h1>Search Results</h1>
<table>
<tr>
<th>Word</th>
<th>Definition</th>
<th>Tags</th>
<th></th>
<th></th>
<th></th>
</tr>
<% @words.each do |word| %>
<tr>
<td><%= word.word %></td>
<td><%= word.tags %></td>
<td><%= word.definition %></td>
<td><%= link_to 'Show', word %></td>
<td><%= link_to 'Edit', edit_word_path(word) %></td>
<td><%= link_to 'Destroy', word, confirm: 'Are you sure?', method: :delete %></td>
</tr>
<% end %>
</table>
<br />
<%= link_to 'New Word', new_word_path %>
<% if session[:user_id] %>
<%= button_to 'Logout', logout_path, method: :delete %>
<% end %>
</div>
<div id="main" >
<%= yield %>
Which is pretty much a standard index.html.erb to return a list.
That is all.
I wanted to add search to my Rails application. Here’s what I did.
1. Search code to the controller, this controller was already built using a scaffold around a Table called “Words”:
controllers/words_controller.rb:
def search
@words = Word.where("word = ?",params[:id]) #all #find(params[:id])
respond_to do |format|
format.html # search.html.erb
format.json { render json: @words }
end
end
I added a view based around the index.html.erb already present. It’s basically identical:
app/views/words/search.html.erb
<h1>Search results</h1>
<table>
<tr>
<th>Word</th>
<th>Definition</th>
<th>Tags</th>
<th></th>
<th></th>
<th></th>
</tr>
<% @words.each do |word| %>
<tr>
<td><%= word.word %></td>
<td><%= word.tags %></td>
<td><%= word.definition %></td>
<td><%= link_to 'Show', word %></td>
<td><%= link_to 'Edit', edit_word_path(word) %></td>
<td><%= link_to 'Destroy', word, confirm: 'Are you sure?', method: :delete %></td>
</tr>
<% end %>
</table>
<br />
<%= link_to 'New Word', new_word_path %>
<% if session[:user_id] %>
<%= button_to 'Logout', logout_path, method: :delete %>
<% end %>
</div>
<div id="main" >
<%= yield %>
I added the following rule to config/routes.rb:
match ':controller(/:action(/:id))'
Which if I’ve understood it correctly sends any http://blah/anycontroller/action/something to the anycontroller’s action method using something as a parameter (kind of).
I can then do searches such as:
http://localhost:3000/words/search/wordtosearchfor
Will need to add a html form to perform the search (somehow).
Clearly not great if you’re code is returning a lot of search results.
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