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annotate 1-Ruby/acts_as_csv_module-irb.output @ 46:eac30c1b92da

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Add more notes and try to understand the operators
author IBBoard <dev@ibboard.co.uk>
date Wed, 20 Sep 2017 20:48:37 +0100
parents 2ea3b5e9b41b
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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27
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1 acts_as_csv_module.rb(main):001:0> #---
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2 acts_as_csv_module.rb(main):002:0* # Excerpted from "Seven Languages in Seven Weeks",
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3 acts_as_csv_module.rb(main):003:0* # published by The Pragmatic Bookshelf.
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4 acts_as_csv_module.rb(main):004:0* # Copyrights apply to this code. It may not be used to create training material,
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5 acts_as_csv_module.rb(main):005:0* # courses, books, articles, and the like. Contact us if you are in doubt.
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6 acts_as_csv_module.rb(main):006:0* # We make no guarantees that this code is fit for any purpose.
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7 acts_as_csv_module.rb(main):007:0* # Visit http://www.pragmaticprogrammer.com/titles/btlang for more book information.
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8 acts_as_csv_module.rb(main):008:0* #---
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9 acts_as_csv_module.rb(main):009:0* module ActsAsCsv
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10 acts_as_csv_module.rb(main):010:1> def self.included(base)
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11 acts_as_csv_module.rb(main):011:2> base.extend ClassMethods
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12 acts_as_csv_module.rb(main):012:2> # The book doesn't do this, but it is possible to add the methods
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13 acts_as_csv_module.rb(main):013:2* # without having the inheriting class call a second function to do it
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14 acts_as_csv_module.rb(main):014:2* base.acts_as_csv
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15 acts_as_csv_module.rb(main):015:2> end
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16 acts_as_csv_module.rb(main):016:1>
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17 acts_as_csv_module.rb(main):017:1* module ClassMethods
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18 acts_as_csv_module.rb(main):018:2> def acts_as_csv
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19 acts_as_csv_module.rb(main):019:3> include InstanceMethods
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20 acts_as_csv_module.rb(main):020:3> end
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21 acts_as_csv_module.rb(main):021:2> end
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22 acts_as_csv_module.rb(main):022:1>
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23 acts_as_csv_module.rb(main):023:1* module InstanceMethods
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24 acts_as_csv_module.rb(main):024:2>
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25 acts_as_csv_module.rb(main):025:2* def read
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26 acts_as_csv_module.rb(main):026:3> self.csv_contents = []
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27 acts_as_csv_module.rb(main):027:3> filename = self.class.to_s.downcase + '.txt'
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28 acts_as_csv_module.rb(main):028:3> file = File.new(filename)
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29 acts_as_csv_module.rb(main):029:3> @headers = file.gets.chomp.split(', ')
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30 acts_as_csv_module.rb(main):030:3>
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31 acts_as_csv_module.rb(main):031:3* file.each do |row|
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32 acts_as_csv_module.rb(main):032:4* csv_row = CsvRow.new(headers, row.chomp.split(', '))
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33 acts_as_csv_module.rb(main):033:4> @csv_contents << csv_row
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34 acts_as_csv_module.rb(main):034:4> end
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35 acts_as_csv_module.rb(main):035:3> end
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36 acts_as_csv_module.rb(main):036:2>
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37 acts_as_csv_module.rb(main):037:2* attr_accessor :headers, :csv_contents
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38 acts_as_csv_module.rb(main):038:2> def initialize
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39 acts_as_csv_module.rb(main):039:3> read
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40 acts_as_csv_module.rb(main):040:3> end
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41 acts_as_csv_module.rb(main):041:2>
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42 acts_as_csv_module.rb(main):042:2* def each()
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43 acts_as_csv_module.rb(main):043:3> self.csv_contents.each { |row| yield row }
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44 acts_as_csv_module.rb(main):044:3> end
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45 acts_as_csv_module.rb(main):045:2> end
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46 acts_as_csv_module.rb(main):046:1> end
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47 => :each
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48 acts_as_csv_module.rb(main):047:0>
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49 acts_as_csv_module.rb(main):048:0* class RubyCsv # no inheritance! You can mix it in
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50 acts_as_csv_module.rb(main):049:1> include ActsAsCsv
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51 acts_as_csv_module.rb(main):050:1> # Also, nothing to do beyond the "include" - it automatically defines the methods!
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52 acts_as_csv_module.rb(main):051:1* end
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53 => RubyCsv
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54 acts_as_csv_module.rb(main):052:0>
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55 acts_as_csv_module.rb(main):053:0* class CsvRow
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56 acts_as_csv_module.rb(main):054:1> attr_reader :values
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57 acts_as_csv_module.rb(main):055:1>
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58 acts_as_csv_module.rb(main):056:1* def initialize(headers, values)
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59 acts_as_csv_module.rb(main):057:2> @values = Hash[headers.zip(values)]
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60 acts_as_csv_module.rb(main):058:2> end
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61 acts_as_csv_module.rb(main):059:1>
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62 acts_as_csv_module.rb(main):060:1* def method_missing(methId, *args)
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63 acts_as_csv_module.rb(main):061:2> str = methId.id2name
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64 acts_as_csv_module.rb(main):062:2> if @values.key?(str)
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65 acts_as_csv_module.rb(main):063:3> return @values[str]
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66 acts_as_csv_module.rb(main):064:3> else
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67 acts_as_csv_module.rb(main):065:3* super.method_missing(methId)
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68 acts_as_csv_module.rb(main):066:3> end
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69 acts_as_csv_module.rb(main):067:2> end
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70 acts_as_csv_module.rb(main):068:1> end
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71 => :method_missing
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72 acts_as_csv_module.rb(main):069:0>
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73 acts_as_csv_module.rb(main):070:0* m = RubyCsv.new
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74 => #<RubyCsv:0x0000000212caf8 @csv_contents=[#<CsvRow:0x0000000212c558 @values={"first"=>"Yukihiro", "last"=>"Matsumoto", "country"=>"Japan"}>, #<CsvRow:0x0000000212c170 @values={"first"=>"Bruce", "last"=>"Tate", "country"=>"USA"}>], @headers=["first", "last", "country"]>
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75 acts_as_csv_module.rb(main):071:0> puts m.headers.inspect
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76 ["first", "last", "country"]
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77 => nil
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78 acts_as_csv_module.rb(main):072:0> puts m.csv_contents.inspect
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79 [#<CsvRow:0x0000000212c558 @values={"first"=>"Yukihiro", "last"=>"Matsumoto", "country"=>"Japan"}>, #<CsvRow:0x0000000212c170 @values={"first"=>"Bruce", "last"=>"Tate", "country"=>"USA"}>]
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80 => nil
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81 acts_as_csv_module.rb(main):073:0> # Use method_missing to implement heading-as-a-method
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82 acts_as_csv_module.rb(main):074:0* puts m.csv_contents[0].country
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83 Japan
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84 => nil
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85 acts_as_csv_module.rb(main):075:0> # And show that we still get normal failure behaviour
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86 acts_as_csv_module.rb(main):076:0* puts m.csv_contents[0].Country
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87 NoMethodError: undefined method `Country' for #<CsvRow:0x0000000212c558>
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88 from acts_as_csv_module.rb:65:in `method_missing'
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89 from acts_as_csv_module.rb:76
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90 from /usr/bin/irb:11:in `<main>'
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91 acts_as_csv_module.rb(main):077:0>
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92 acts_as_csv_module.rb(main):078:0*
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93 acts_as_csv_module.rb(main):078:0>