The Inflector transforms words from singular to plural, class names to table names, modularized class names to ones without, and class names to foreign keys. The default inflections for pluralization, singularization, and uncountable words are kept in inflections.rb.

Methods
Classes and Modules
Class Inflector::Inflections
Public Instance methods
camelize(lower_case_and_underscored_word, first_letter_in_uppercase = true)

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     # File lib/active_support/inflector.rb, line 112
112:   def camelize(lower_case_and_underscored_word, first_letter_in_uppercase = true)
113:     if first_letter_in_uppercase
114:       lower_case_and_underscored_word.to_s.gsub(/\/(.?)/) { "::" + $1.upcase }.gsub(/(^|_)(.)/) { $2.upcase }
115:     else
116:       lower_case_and_underscored_word.first + camelize(lower_case_and_underscored_word)[1..-1]
117:     end
118:   end
camelize(lower_case_and_underscored_word, first_letter_in_uppercase = true)

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     # File lib/active_support/inflector.rb, line 112
112:   def camelize(lower_case_and_underscored_word, first_letter_in_uppercase = true)
113:     if first_letter_in_uppercase
114:       lower_case_and_underscored_word.to_s.gsub(/\/(.?)/) { "::" + $1.upcase }.gsub(/(^|_)(.)/) { $2.upcase }
115:     else
116:       lower_case_and_underscored_word.first + camelize(lower_case_and_underscored_word)[1..-1]
117:     end
118:   end
classify(table_name)

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     # File lib/active_support/inflector.rb, line 148
148:   def classify(table_name)
149:     camelize(singularize(table_name))
150:   end
classify(table_name)

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     # File lib/active_support/inflector.rb, line 148
148:   def classify(table_name)
149:     camelize(singularize(table_name))
150:   end
constantize(camel_cased_word)

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     # File lib/active_support/inflector.rb, line 156
156:   def constantize(camel_cased_word)
157:     raise NameError, "#{camel_cased_word.inspect} is not a valid constant name!" unless
158:       /^(::)?([A-Z]\w*)(::[A-Z]\w*)*$/ =~ camel_cased_word
159:     
160:     camel_cased_word = "::#{camel_cased_word}" unless $1
161:     Object.module_eval(camel_cased_word, __FILE__, __LINE__)
162:   end
constantize(camel_cased_word)

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     # File lib/active_support/inflector.rb, line 156
156:   def constantize(camel_cased_word)
157:     raise NameError, "#{camel_cased_word.inspect} is not a valid constant name!" unless
158:       /^(::)?([A-Z]\w*)(::[A-Z]\w*)*$/ =~ camel_cased_word
159:     
160:     camel_cased_word = "::#{camel_cased_word}" unless $1
161:     Object.module_eval(camel_cased_word, __FILE__, __LINE__)
162:   end
dasherize(underscored_word)

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     # File lib/active_support/inflector.rb, line 132
132:   def dasherize(underscored_word)
133:     underscored_word.gsub(/_/, '-')
134:   end
dasherize(underscored_word)

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     # File lib/active_support/inflector.rb, line 132
132:   def dasherize(underscored_word)
133:     underscored_word.gsub(/_/, '-')
134:   end
demodulize(class_name_in_module)

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     # File lib/active_support/inflector.rb, line 140
140:   def demodulize(class_name_in_module)
141:     class_name_in_module.to_s.gsub(/^.*::/, '')
142:   end
demodulize(class_name_in_module)

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     # File lib/active_support/inflector.rb, line 140
140:   def demodulize(class_name_in_module)
141:     class_name_in_module.to_s.gsub(/^.*::/, '')
142:   end
foreign_key(class_name, separate_class_name_and_id_with_underscore = true)

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     # File lib/active_support/inflector.rb, line 152
152:   def foreign_key(class_name, separate_class_name_and_id_with_underscore = true)
153:     underscore(demodulize(class_name)) + (separate_class_name_and_id_with_underscore ? "_id" : "id")
154:   end
foreign_key(class_name, separate_class_name_and_id_with_underscore = true)

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     # File lib/active_support/inflector.rb, line 152
152:   def foreign_key(class_name, separate_class_name_and_id_with_underscore = true)
153:     underscore(demodulize(class_name)) + (separate_class_name_and_id_with_underscore ? "_id" : "id")
154:   end
humanize(lower_case_and_underscored_word)

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     # File lib/active_support/inflector.rb, line 136
136:   def humanize(lower_case_and_underscored_word)
137:     lower_case_and_underscored_word.to_s.gsub(/_id$/, "").gsub(/_/, " ").capitalize
138:   end
humanize(lower_case_and_underscored_word)

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     # File lib/active_support/inflector.rb, line 136
136:   def humanize(lower_case_and_underscored_word)
137:     lower_case_and_underscored_word.to_s.gsub(/_id$/, "").gsub(/_/, " ").capitalize
138:   end
inflections() {|Inflections.instance| ...}

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    # File lib/active_support/inflector.rb, line 82
82:   def inflections
83:     if block_given?
84:       yield Inflections.instance
85:     else
86:       Inflections.instance
87:     end
88:   end
inflections() {|Inflections.instance| ...}

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    # File lib/active_support/inflector.rb, line 82
82:   def inflections
83:     if block_given?
84:       yield Inflections.instance
85:     else
86:       Inflections.instance
87:     end
88:   end
ordinalize(number)

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     # File lib/active_support/inflector.rb, line 164
164:   def ordinalize(number)
165:     if (11..13).include?(number.to_i % 100)
166:       "#{number}th"
167:     else
168:       case number.to_i % 10
169:         when 1: "#{number}st"
170:         when 2: "#{number}nd"
171:         when 3: "#{number}rd"
172:         else    "#{number}th"
173:       end
174:     end
175:   end
ordinalize(number)

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     # File lib/active_support/inflector.rb, line 164
164:   def ordinalize(number)
165:     if (11..13).include?(number.to_i % 100)
166:       "#{number}th"
167:     else
168:       case number.to_i % 10
169:         when 1: "#{number}st"
170:         when 2: "#{number}nd"
171:         when 3: "#{number}rd"
172:         else    "#{number}th"
173:       end
174:     end
175:   end
pluralize(word)

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    # File lib/active_support/inflector.rb, line 90
90:   def pluralize(word)
91:     result = word.to_s.dup
92: 
93:     if inflections.uncountables.include?(result.downcase)
94:       result
95:     else
96:       inflections.plurals.each { |(rule, replacement)| break if result.gsub!(rule, replacement) }
97:       result
98:     end
99:   end
pluralize(word)

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    # File lib/active_support/inflector.rb, line 90
90:   def pluralize(word)
91:     result = word.to_s.dup
92: 
93:     if inflections.uncountables.include?(result.downcase)
94:       result
95:     else
96:       inflections.plurals.each { |(rule, replacement)| break if result.gsub!(rule, replacement) }
97:       result
98:     end
99:   end
singularize(word)

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     # File lib/active_support/inflector.rb, line 101
101:   def singularize(word)
102:     result = word.to_s.dup
103: 
104:     if inflections.uncountables.include?(result.downcase)
105:       result
106:     else
107:       inflections.singulars.each { |(rule, replacement)| break if result.gsub!(rule, replacement) }
108:       result
109:     end
110:   end
singularize(word)

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     # File lib/active_support/inflector.rb, line 101
101:   def singularize(word)
102:     result = word.to_s.dup
103: 
104:     if inflections.uncountables.include?(result.downcase)
105:       result
106:     else
107:       inflections.singulars.each { |(rule, replacement)| break if result.gsub!(rule, replacement) }
108:       result
109:     end
110:   end
tableize(class_name)

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     # File lib/active_support/inflector.rb, line 144
144:   def tableize(class_name)
145:     pluralize(underscore(class_name))
146:   end
tableize(class_name)

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     # File lib/active_support/inflector.rb, line 144
144:   def tableize(class_name)
145:     pluralize(underscore(class_name))
146:   end
titleize(word)

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     # File lib/active_support/inflector.rb, line 120
120:   def titleize(word)
121:     humanize(underscore(word)).gsub(/\b([a-z])/) { $1.capitalize }
122:   end
titleize(word)

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     # File lib/active_support/inflector.rb, line 120
120:   def titleize(word)
121:     humanize(underscore(word)).gsub(/\b([a-z])/) { $1.capitalize }
122:   end
underscore(camel_cased_word)

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     # File lib/active_support/inflector.rb, line 124
124:   def underscore(camel_cased_word)
125:     camel_cased_word.to_s.gsub(/::/, '/').
126:       gsub(/([A-Z]+)([A-Z][a-z])/,'\1_\2').
127:       gsub(/([a-z\d])([A-Z])/,'\1_\2').
128:       tr("-", "_").
129:       downcase
130:   end
underscore(camel_cased_word)

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     # File lib/active_support/inflector.rb, line 124
124:   def underscore(camel_cased_word)
125:     camel_cased_word.to_s.gsub(/::/, '/').
126:       gsub(/([A-Z]+)([A-Z][a-z])/,'\1_\2').
127:       gsub(/([a-z\d])([A-Z])/,'\1_\2').
128:       tr("-", "_").
129:       downcase
130:   end