Sequent-Sinatra

Use the sequent gem with the Sinatra web framework.

Provides functionality to initialize sequent and form helpers to bind forms to Sequent::Core::Commands.

Getting started

gem install sequent-sinatra

class MyApp < Sinatra::Base
  register Sequent::Web::Sinatra::App
end

See the sample application for sequent-sinatra in action.

Documentation

Configuration

sequent_config_dir contains the location of initializers/sequent.rb file that is uses to initialize sequent. By default it will use the value root configured in your sinatra app.

Example

class MyApp < Sinatra::Base
  set :sequent_config_dir, "#{root}/config"
  register Sequent::Web::Sinatra::App
end

A minimal example of your initializers/sequent.rb

Sequent.configure do |config|
 config.event_handlers = [MyEventHandler.new]
 config.command_handlers = [MyCommandHandler.new]
end

Formhelpers

Sequent sinatra provides basic form helpers to bind forms to Commands.

Example:

Given this application

class MyApp < Sinatra::Base
  set :sequent_config_dir, "#{root}/config"
  register Sequent::Web::Sinatra::App
  get '/' do
    @command = SignupCommand.new
    erb :index
  end
  post '/' do
    @command = CreateInvoiceCommand.from_params(params[:signup_command])
    execute_command @command do |errors|
          if errors
            erb :index
          else
            redirect '/some-other-page'
          end
    end
  end
end

class SignupCommand < Sequent::Core::Command
  attrs username: String
  validates_presence_of :username
end

You can use the form helpers as follows

<% html_form_for(@command, "/", :post) do |form| %>
  <% form.fieldset(@command.class.to_s.underscore.to_sym) do |f| %>
    <%= f.raw_input :username, class: "form-input" %>
  <% end %>
  <input type="submit" value="Save">
<% end %>

This outputs to the following HTML

<form action="/" method="POST" role="form">
  <input type="hidden" name="_csrf" value="MAF4FQZPM4lssJnB7nyn4UlEssTAQnbVVsMRdfmLcmY=" />
  <input class="form-input" id="signup_command_username" name="signup_command[username]" type="text" />
  <input type="submit" value="Save">
</form>

Various for helpers exist

• raw_input
• raw_checkbox
• raw_password
• raw_textarea
• raw_hidden
• raw_select
• raw_radio

You can provide the following parameters to these helper methods

• class the css class
• value default value of the field. This is used when the actual value is nil

Contributing

Fork and send pull requests

Running the specs

rspec

License

Sequent Sinatra is released under the MIT License