ActiveSupport:
*Core Extensions String Inflection
Core Extensions String Inflection
suggest changeString#pluralize
Returns of plural form of the string. Optionally takes a count parameter and returns singular form if count == 1. Also accepts a locale parameter for language-specific pluralization.
'post'.pluralize # => "posts"'octopus'.pluralize # => "octopi"'sheep'.pluralize # => "sheep"'words'.pluralize # => "words"'the blue mailman'.pluralize # => "the blue mailmen"'CamelOctopus'.pluralize # => "CamelOctopi"'apple'.pluralize(1) # => "apple"'apple'.pluralize(2) # => "apples"'ley'.pluralize(:es) # => "leyes"'ley'.pluralize(1, :es) # => "ley"String#singularize
Returns the singular form of the string. Accepts an optional locale parameter.
'posts'.singularize # => "post"'octopi'.singularize # => "octopus"'sheep'.singularize # => "sheep"'word'.singularize # => "word"'the blue mailmen'.singularize # => "the blue mailman"'CamelOctopi'.singularize # => "CamelOctopus"'leyes'.singularize(:es) # => "ley"String#constantize
Tries to find a declared constant with the name specified in the string. It raises a NameError when the name is not in CamelCase or is not initialized.
'Module'.constantize # => Module'Class'.constantize # => Class'blargle'.constantize # => NameError: wrong constant name blargleString#safe_constantize
Performs a constantize but returns nil instead of raising NameError.
'Module'.safe_constantize # => Module'Class'.safe_constantize # => Class'blargle'.safe_constantize # => nilString#camelize
Converts strings to UpperCamelCase by default, if :lower is given as param converts to lowerCamelCase instead.
alias: camelcase
Note: will also convert / to :: which is useful for converting paths to namespaces.
'active_record'.camelize # => "ActiveRecord"'active_record'.camelize(:lower) # => "activeRecord"'active_record/errors'.camelize # => "ActiveRecord::Errors"'active_record/errors'.camelize(:lower) # => "activeRecord::Errors"String#titleize
Capitalizes all the words and replaces some characters in the string to create a nicer looking title.
alias: titlecase
'man from the boondocks'.titleize # => "Man From The Boondocks"'x-men: the last stand'.titleize # => "X Men: The Last Stand"String#underscore
Makes an underscored, lowercase form from the expression in the string. The reverse of camelize.
Note: underscore will also change :: to / to convert namespaces to paths.
'ActiveModel'.underscore # => "active_model"'ActiveModel::Errors'.underscore # => "active_model/errors"String#dasherize
Replaces underscores with dashes in the string.
'puni_puni'.dasherize # => "puni-puni"String#demodulize
Removes the module part from the constant expression in the string.
'ActiveRecord::CoreExtensions::String::Inflections'.demodulize # => "Inflections"'Inflections'.demodulize # => "Inflections"'::Inflections'.demodulize # => "Inflections"''.demodulize # => ''String#deconstantize
Removes the rightmost segment from the constant expression in the string.
'Net::HTTP'.deconstantize # => "Net"'::Net::HTTP'.deconstantize # => "::Net"'String'.deconstantize # => ""'::String'.deconstantize # => ""''.deconstantize # => ""String#parameterize
Replaces special characters in a string so that it may be used as part of a ‘pretty’ URL.
"Donald E. Knuth".parameterize # => "donald-e-knuth"Preserve the case of the characters in a string with the :preserve_case argument.
"Donald E. Knuth".parameterize(preserve_case: true) # => "Donald-E-Knuth"A very common use-case for parameterize is to override the to_param method of an ActiveRecord model to support more descriptive url slugs.
class Person < ActiveRecord::Basedef to_param"#{id}-#{name.parameterize}"endendPerson.find(1).to_param # => "1-donald-e-knuth"String#tableize
Creates the name of a table like Rails does for models to table names. Pluralizes the last word in the string.
'RawScaledScorer'.tableize # => "raw_scaled_scorers"'ham_and_egg'.tableize # => "ham_and_eggs"'fancyCategory'.tableize # => "fancy_categories"String#classify
Returns a class name string from a plural table name like Rails does for table names to models.
'ham_and_eggs'.classify # => "HamAndEgg"'posts'.classify # => "Post"String#humanize
Capitalizes the first word, turns underscores into spaces, and strips a trailing _id if present.
'employee_salary'.humanize # => "Employee salary"'author_id'.humanize # => "Author"'author_id'.humanize(capitalize: false) # => "author"'_id'.humanize # => "Id"String#upcase_first
Converts just the first character to uppercase.
'what a Lovely Day'.upcase_first # => "What a Lovely Day"'w'.upcase_first # => "W"''.upcase_first # => ""String#foreign_key
Creates a foreign key name from a class name. Pass false param to disable adding \_ between name and id.
'Message'.foreign_key # => "message_id"'Message'.foreign_key(false) # => "messageid"'Admin::Post'.foreign_key # => "post_id"
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