Just a simple file to build standard routes for a set of objects that will all behave in a similar way

my_app.rb

class MyApp < Sinatra::Base
    RestfulObjects = [
        SampleObject
    ]
    
    require 'restful_sinatra.rb'
end

restful_sinatra.rb

helpers do
    def klass(klass)
        Sequel::Model.send(:constantize, Sequel::Model.send(:camelize, klass))
    end

    def wipe!(params)
        %w(_method splat captures).each { |key| params.delete(key) }
    end
end

MyApp::RestfulObjects.each do |obj|
    get "/#{obj}s" do
        klass    = klass(obj)

        @obj     = obj
        @list    = klass.index.paginate(1, 15)
        @listnav = true
        @title   = "#{klass}s"

        haml :"index/#{obj}"
    end

    get "/#{obj}s/page/:pg" do
        not_found unless params[:pg] =~ /^[0-9]+$/
        klass = klass(obj)

        @obj     = obj
        @list    = klass.index.paginate(params[:pg].to_i, 15)
        @listnav = true
        @title   = "#{klass}s - Page #{params[:pg]}"

        haml :"index/#{obj}"
    end

    get "/#{obj}/new" do
        klass = klass(obj)

        @object    = klass.new
        @title     = "New #{klass}"
        @root_link = "#{obj}s"
        @rest_meth = :post

        haml :"form/#{obj}"
    end

    post "/#{obj}/new" do
        wipe!(params)

        klass  = klass(obj)
        object = klass.new(params)
        object.save

        redirect "/#{obj}/#{object.id}"
    end

    get "/#{obj}/:id/edit" do
        klass   = klass(obj)
        @object = klass[params[:id].to_i]
        not_found unless @object

        @title     = "Edit #{klass}"
        @subtitle  = @object.to_s
        @root_link = "#{obj}s"
        @rest_meth = :put

        haml :"form/#{obj}"
    end

    put "/#{obj}/:id/edit" do
        wipe!(params)

        klass  = klass(obj)
        object = klass[params.delete('id').to_i]
        not_found unless object
        object.update(params)

        redirect "/#{obj}/#{object.id}"
    end

    get "/#{obj}/:id" do
        klass   = klass(obj)
        @object = klass[params[:id].to_i]
        not_found unless @object

        @title     = klass.to_s
        @subtitle  = @object.to_s
        @root_link = "#{obj}s"

        haml :"show/#{obj}"
    end
end

sample_form.haml

%form{:method => :post, :action => ENV['REQUEST_PATH']}
  %input{:type => :hidden, :name => :_method, :value => @rest_meth}
  %label{:for => :name} Name
  %input{:name => :name, :value => @object.name}

  %br

  %label{:for => :some_param} Some Param
  %input{:name => :some_param, :value => @object.some_param}

  %br

  %label.required{:for => :some_other_param} Some Other Param
  %input{:name => :some_other_param, :value => @object.some_other_param}

  %br

  %label.required{:for => :some_date} Some Date
  %input{:type => :date, :name => :some_date, :value => @object.some_date}

  %hr

  %input{:type => :submit, :value => 'Save'}

sample_object.rb

class SampleObject < Sequel::Model
    Sequel.extension :pagination

    # default view orders by :some_param
    def self.index
        dataset.order :some_param
    end
end