More code samples

when_things_go_wrong/foo.rb

@@ -0,0 +1,5 @@
+begin
+  $ 5
+rescue SyntaxError
+  nil
+end

when_things_go_wrong/report_bench.rb

@@ -7,7 +7,7 @@
 
 Benchmark.bmbm do |x|
 
-  x.report("inject-based to_html") do
+  x.report("inject based to_html") do
     csv_data = CSV.read("report_data.csv")
     r1 = ReportUnoptimized.new(csv_data)
     r1.to_html

when_things_go_wrong/server_logging.rb

@@ -24,8 +24,12 @@ def /(x, y)
 
   def handle_request(session)
     action, *args = session.gets.split(/\s/)
-    @logger.info "executing: '#{action}' with #{args.inspect}"
-    session.puts(send(action, *args))
+    if ["*", "/"].include?(action)
+      @logger.info "executing: '#{action}' with #{args.inspect}"
+      session.puts(send(action, *args))
+    else
+      session.puts("Invalid command")
+    end
   rescue StandardError => e
     @logger.error(e.report)
     session.puts "Sorry, something went wrong."

worst_practices/kittens.txt

@@ -0,0 +1,4 @@
+The kittens make me happy.  They are hidden between the pages of this book, 
+secretly smiling at you while you read.
+
+Wasn't that a great story?

worst_practices/library.rb

@@ -0,0 +1,58 @@
+module FattyRBP
+  class Formatter
+
+    def self.formats
+     @formats ||= {}
+    end
+
+     def self.format(name, options={}, &block)
+       formats[name] = Class.new(FattyRBP::Format, &block)
+     end
+
+     def self.render(format, options={})
+       formats[format].new(options).render
+     end
+   end
+
+  class Format
+    def initialize(options)
+      # not important
+    end
+  end
+end
+
+
+class Hello < FattyRBP::Formatter 
+  format :text do
+    def render
+      "Hello World"
+    end
+  end
+
+  format :html do
+    def render
+      "<b>Hello World</b>"
+    end
+  end
+end
+
+puts Hello.render(:text)
+puts Hello.render(:html)
+
+
+class Goodbye < FattyRBP::Formatter
+  format :text do
+    def render
+      "Goodbye Cruel World!"
+    end
+  end
+ end
+
+puts Goodbye.render(:text)
+
+
+# Should not have changed
+puts Hello.render(:text)
+
+# Shouldn't exist
+puts Goodbye.render(:html)

worst_practices/user.rb

@@ -0,0 +1,33 @@
+require "pstore"
+
+class User
+
+  def self.data
+    @data ||= PStore.new("users.store")
+  end
+
+  def self.add(id, user_data)
+    data.transaction do
+      data[id] = user_data
+    end
+  end
+
+  def self.find(id)
+    data.transaction do
+      data[id] or raise "User not found"
+    end
+  end
+
+  def initialize(id)
+    @user_id = id
+  end
+
+  def attributes
+    self.class.find(@user_id)
+  end
+
+  def first_name
+    attributes[:first_name]
+  end
+
+end