### Home Classes Methods

### In Files

- lib/sequel/model/inflections.rb

### Methods

- ::clear
- ::irregular
- ::plural
- ::singular
- ::uncountable
- #camelize
- #constantize
- #demodulize
- #pluralize
- #singularize
- #underscore

### Files

- CHANGELOG
- MIT-LICENSE
- README.rdoc
- active_record.rdoc
- advanced_associations.rdoc
- association_basics.rdoc
- cheat_sheet.rdoc
- dataset_basics.rdoc
- dataset_filtering.rdoc
- mass_assignment.rdoc
- migration.rdoc
- model_hooks.rdoc
- opening_databases.rdoc
- prepared_statements.rdoc
- querying.rdoc
- reflection.rdoc
- 1.0.txt
- 1.1.txt
- 1.3.txt
- 1.4.0.txt
- 1.5.0.txt
- 2.0.0.txt
- 2.1.0.txt
- 2.10.0.txt
- 2.11.0.txt
- 2.12.0.txt
- 2.2.0.txt
- 2.3.0.txt
- 2.4.0.txt
- 2.5.0.txt
- 2.6.0.txt
- 2.7.0.txt
- 2.8.0.txt
- 2.9.0.txt
- 3.0.0.txt
- 3.1.0.txt
- 3.10.0.txt
- 3.11.0.txt
- 3.12.0.txt
- 3.13.0.txt
- 3.14.0.txt
- 3.15.0.txt
- 3.16.0.txt
- 3.17.0.txt
- 3.18.0.txt
- 3.19.0.txt
- 3.2.0.txt
- 3.20.0.txt
- 3.21.0.txt
- 3.22.0.txt
- 3.23.0.txt
- 3.24.0.txt
- 3.25.0.txt
- 3.26.0.txt
- 3.27.0.txt
- 3.28.0.txt
- 3.29.0.txt
- 3.3.0.txt
- 3.30.0.txt
- 3.31.0.txt
- 3.32.0.txt
- 3.33.0.txt
- 3.4.0.txt
- 3.5.0.txt
- 3.6.0.txt
- 3.7.0.txt
- 3.8.0.txt
- 3.9.0.txt
- schema_modification.rdoc
- sharding.rdoc
- sql.rdoc
- testing.rdoc
- transactions.rdoc
- validations.rdoc
- virtual_rows.rdoc

### Class Index

Quicksearch

- Sequel
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- Sequel::Plugins::InstanceHooks
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- Sequel::Plugins::JsonSerializer::ClassMethods
- Sequel::Plugins::JsonSerializer::DatasetMethods
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- Sequel::Plugins::JsonSerializer::Literal
- Sequel::Plugins::LazyAttributes
- Sequel::Plugins::LazyAttributes::ClassMethods
- Sequel::Plugins::LazyAttributes::InstanceMethods
- Sequel::Plugins::List
- Sequel::Plugins::List::ClassMethods
- Sequel::Plugins::List::InstanceMethods
- Sequel::Plugins::ManyThroughMany
- Sequel::Plugins::ManyThroughMany::ClassMethods
- Sequel::Plugins::ManyThroughMany::DatasetMethods
- Sequel::Plugins::ManyThroughMany::ManyThroughManyAssociationReflection
- Sequel::Plugins::NestedAttributes
- Sequel::Plugins::NestedAttributes::ClassMethods
- Sequel::Plugins::NestedAttributes::InstanceMethods
- Sequel::Plugins::OptimisticLocking
- Sequel::Plugins::OptimisticLocking::ClassMethods
- Sequel::Plugins::OptimisticLocking::InstanceMethods
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- Sequel::Plugins::PreparedStatements::InstanceMethods
- Sequel::Plugins::PreparedStatementsAssociations
- Sequel::Plugins::PreparedStatementsAssociations::ClassMethods
- Sequel::Plugins::PreparedStatementsAssociations::InstanceMethods
- Sequel::Plugins::PreparedStatementsSafe
- Sequel::Plugins::PreparedStatementsSafe::ClassMethods
- Sequel::Plugins::PreparedStatementsSafe::InstanceMethods
- Sequel::Plugins::PreparedStatementsWithPk
- Sequel::Plugins::PreparedStatementsWithPk::ClassMethods
- Sequel::Plugins::PreparedStatementsWithPk::DatasetMethods
- Sequel::Plugins::RcteTree
- Sequel::Plugins::Schema
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- Sequel::Plugins::Serialization
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- Sequel::Plugins::Serialization::InstanceMethods
- Sequel::Plugins::SerializationModificationDetection
- Sequel::Plugins::SerializationModificationDetection::InstanceMethods
- Sequel::Plugins::Sharding
- Sequel::Plugins::Sharding::ClassMethods
- Sequel::Plugins::Sharding::DatasetMethods
- Sequel::Plugins::Sharding::InstanceMethods
- Sequel::Plugins::SingleTableInheritance
- Sequel::Plugins::SingleTableInheritance::ClassMethods
- Sequel::Plugins::SingleTableInheritance::InstanceMethods
- Sequel::Plugins::SkipCreateRefresh
- Sequel::Plugins::SkipCreateRefresh::InstanceMethods
- Sequel::Plugins::StringStripper
- Sequel::Plugins::StringStripper::InstanceMethods
- Sequel::Plugins::Subclasses
- Sequel::Plugins::Subclasses::ClassMethods
- Sequel::Plugins::TacticalEagerLoading
- Sequel::Plugins::TacticalEagerLoading::DatasetMethods
- Sequel::Plugins::TacticalEagerLoading::InstanceMethods
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- Sequel::Plugins::Timestamps::InstanceMethods
- Sequel::Plugins::Touch
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- Sequel::Plugins::Touch::InstanceMethods
- Sequel::Plugins::Tree
- Sequel::Plugins::Tree::ClassMethods
- Sequel::Plugins::Tree::InstanceMethods
- Sequel::Plugins::Tree::SingleRoot
- Sequel::Plugins::Tree::SingleRoot::ClassMethods
- Sequel::Plugins::Tree::SingleRoot::InstanceMethods
- Sequel::Plugins::Tree::TreeMultipleRootError
- Sequel::Plugins::TypecastOnLoad
- Sequel::Plugins::TypecastOnLoad::ClassMethods
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- Sequel::Plugins::ValidationClassMethods
- Sequel::Plugins::ValidationClassMethods::ClassMethods
- Sequel::Plugins::ValidationClassMethods::ClassMethods::Generator
- Sequel::Plugins::ValidationClassMethods::InstanceMethods
- Sequel::Plugins::ValidationHelpers
- Sequel::Plugins::ValidationHelpers::InstanceMethods
- Sequel::Plugins::XmlSerializer
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- Sequel::Plugins::XmlSerializer::InstanceMethods
- Sequel::PoolTimeout
- Sequel::PoolTimeout
- Sequel::Postgres
- Sequel::Postgres::AdapterMethods
- Sequel::Postgres::DatabaseMethods
- Sequel::Postgres::DatasetMethods
- Sequel::Postgres::DatasetMethods::PreparedStatementMethods
- Sequel::PrettyTable
- Sequel::Progress
- Sequel::Progress::DatabaseMethods
- Sequel::Progress::DatasetMethods
- Sequel::Qualifier
- Sequel::Rollback
- Sequel::Rollback
- Sequel::SQL
- Sequel::SQL::AliasMethods
- Sequel::SQL::AliasedExpression
- Sequel::SQL::BitwiseMethods
- Sequel::SQL::Blob
- Sequel::SQL::BooleanConstant
- Sequel::SQL::BooleanExpression
- Sequel::SQL::BooleanMethods
- Sequel::SQL::CaseExpression
- Sequel::SQL::Cast
- Sequel::SQL::CastMethods
- Sequel::SQL::ColumnAll
- Sequel::SQL::ComplexExpression
- Sequel::SQL::ComplexExpressionMethods
- Sequel::SQL::Constant
- Sequel::SQL::Constants
- Sequel::SQL::Expression
- Sequel::SQL::Function
- Sequel::SQL::GenericComplexExpression
- Sequel::SQL::GenericExpression
- Sequel::SQL::Identifier
- Sequel::SQL::IdentifierMethods
- Sequel::SQL::InequalityMethods
- Sequel::SQL::JoinClause
- Sequel::SQL::JoinOnClause
- Sequel::SQL::JoinUsingClause
- Sequel::SQL::NegativeBooleanConstant
- Sequel::SQL::NoBooleanInputMethods
- Sequel::SQL::NumericExpression
- Sequel::SQL::NumericMethods
- Sequel::SQL::OrderMethods
- Sequel::SQL::OrderedExpression
- Sequel::SQL::PlaceholderLiteralString
- Sequel::SQL::QualifiedIdentifier
- Sequel::SQL::QualifyingMethods
- Sequel::SQL::StringConcatenationMethods
- Sequel::SQL::StringExpression
- Sequel::SQL::StringMethods
- Sequel::SQL::Subscript
- Sequel::SQL::SubscriptMethods
- Sequel::SQL::ValueList
- Sequel::SQL::ValueList
- Sequel::SQL::VirtualRow
- Sequel::SQL::Window
- Sequel::SQL::WindowFunction
- Sequel::SQLTime
- Sequel::SQLite
- Sequel::SQLite::DatabaseMethods
- Sequel::SQLite::DatasetMethods
- Sequel::Schema
- Sequel::Schema::AlterTableGenerator
- Sequel::Schema::Generator
- Sequel::ServerBlock
- Sequel::ShardedSingleConnectionPool
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- Sequel::SimpleMigration
- Sequel::SingleConnectionPool
- Sequel::Swift
- Sequel::Swift::Database
- Sequel::Swift::Dataset
- Sequel::Swift::MySQL
- Sequel::Swift::MySQL::DatabaseMethods
- Sequel::Swift::MySQL::Dataset
- Sequel::Swift::Postgres
- Sequel::Swift::Postgres::AdapterMethods
- Sequel::Swift::Postgres::DatabaseMethods
- Sequel::Swift::Postgres::Dataset
- Sequel::Swift::SQLite
- Sequel::Swift::SQLite::DatabaseMethods
- Sequel::Swift::SQLite::Dataset
- Sequel::ThreadLocalTimezones
- Sequel::ThreadedConnectionPool
- Sequel::ThreadedServerBlock
- Sequel::TimestampMigrator
- Sequel::Timezones
- Sequel::TinyTDS
- Sequel::TinyTDS::Database
- Sequel::TinyTDS::Dataset
- Sequel::TinyTDS::Dataset::ArgumentMapper
- Sequel::TinyTDS::Dataset::PreparedStatementMethods
- Sequel::ToDot
- Sequel::UnbindDuplicate
- Sequel::Unbinder
- Sequel::UndefinedAssociation
- Sequel::UnthreadedServerBlock
- Sequel::ValidationFailed
- Dataset
- Dataset::ArgumentMapper
- Dataset::BindArgumentMethods
- Dataset::PreparedStatementMethods
- String
- String::Inflections
- Array
- FalseClass
- Hash
- NilClass
- Numeric
- Object
- PGconn
- PGresult
- Proc
- Symbol
- TrueClass

No matching classes.

# Sequel::Inflections

This module acts as a singleton returned/yielded by Sequel.inflections, which is used to override or specify additional inflection rules for Sequel. Examples:

      Sequel.inflections do |inflect|
        inflect.plural /^(ox)$/i, '\1\2en'
        inflect.singular /^(ox)en/i, '\1'

        inflect.irregular 'octopus', 'octopi'

        inflect.uncountable "equipment"
      end

New rules are added at the top. So in the example above, the irregular rule for octopus will now be the first of the pluralization and singularization rules that is runs. This guarantees that your rules run before any of the rules that may already have been loaded.

### Constants

CAMELIZE_CONVERT_REGEXP
CAMELIZE_MODULE_REGEXP
DASH
DEMODULIZE_CONVERT_REGEXP
EMPTY_STRING
SLASH
VALID_CONSTANT_NAME_REGEXP
UNDERSCORE
UNDERSCORE_CONVERT_REGEXP1
UNDERSCORE_CONVERT_REGEXP2
UNDERSCORE_CONVERT_REPLACE
UNDERSCORE_MODULE_REGEXP

### Attributes

plurals[R]

Array of two element arrays, first containing a regex, and the second containing a substitution pattern, used for plurization.

singulars[R]

Array of two element arrays, first containing a regex, and the second containing a substitution pattern, used for singularization.

uncountables[R]

Array of strings for words were the singular form is the same as the plural form

### Public Class Methods

clear(scope = :all) click to toggle source

Clears the loaded inflections within a given scope (default is :all). Give the scope as a symbol of the inflection type, the options are: :plurals, :singulars, :uncountables

Examples:

      clear :all
      clear :plurals

        # File lib/sequel/model/inflections.rb, line 58
    58:     def self.clear(scope = :all)
    59:       case scope
    60:       when :all
    61:         @plurals, @singulars, @uncountables = [], [], []
    62:       else
    63:         instance_variable_set("@#{scope}", [])
    64:       end
    65:     end

irregular(singular, plural) click to toggle source

Specifies a new irregular that applies to both pluralization and singularization at the same time. This can only be used for strings, not regular expressions. You simply pass the irregular in singular and plural form.

Examples:

      irregular 'octopus', 'octopi'
      irregular 'person', 'people'

        # File lib/sequel/model/inflections.rb, line 73
    73:     def self.irregular(singular, plural)
    74:       plural(Regexp.new("(#{singular[0,1]})#{singular[1..-1]}$", "i"), '\1' + plural[1..1])
    75:       singular(Regexp.new("(#{plural[0,1]})#{plural[1..-1]}$", "i"), '\1' + singular[1..1])
    76:     end

plural(rule, replacement) click to toggle source

Specifies a new pluralization rule and its replacement. The rule can either be a string or a regular expression. The replacement should always be a string that may include references to the matched data from the rule.

Example:

      plural(/(x|ch|ss|sh)$/i, '\1es')

        # File lib/sequel/model/inflections.rb, line 83
    83:     def self.plural(rule, replacement)
    84:       @plurals.insert(0, [rule, replacement])
    85:     end

singular(rule, replacement) click to toggle source

Specifies a new singularization rule and its replacement. The rule can either be a string or a regular expression. The replacement should always be a string that may include references to the matched data from the rule.

Example:

      singular(/([^aeiouy]|qu)ies$/i, '\1y')

        # File lib/sequel/model/inflections.rb, line 92
    92:     def self.singular(rule, replacement)
    93:       @singulars.insert(0, [rule, replacement])
    94:     end

uncountable(*words) click to toggle source

Add uncountable words that shouldn’t be attempted inflected.

Examples:

      uncountable "money"
      uncountable "money", "information"
      uncountable %w( money information rice )

         # File lib/sequel/model/inflections.rb, line 102
    102:     def self.uncountable(*words)
    103:       (@uncountables << words).flatten!
    104:     end

### Private Instance Methods

camelize(s) click to toggle source

Convert the given string to CamelCase. Will also convert ’/’ to ’::’ which is useful for converting paths to namespaces.

         # File lib/sequel/model/inflections.rb, line 111
    111:     def camelize(s)
    112:       s = s.to_s
    113:       return s.camelize if s.respond_to?(:camelize)
    114:       s = s.gsub(CAMELIZE_MODULE_REGEXP){|x| "::#{x[-1..-1].upcase unless x == SLASH}"}.gsub(CAMELIZE_CONVERT_REGEXP){|x| x[1..1].upcase}
    115:       s
    116:     end

constantize(s) click to toggle source

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.

         # File lib/sequel/model/inflections.rb, line 121
    121:     def constantize(s)
    122:       s = s.to_s
    123:       return s.constantize if s.respond_to?(:constantize)
    124:       raise(NameError, "#{s.inspect} is not a valid constant name!") unless m = VALID_CONSTANT_NAME_REGEXP.match(s)
    125:       Object.module_eval("::#{m[1]}", __FILE__, __LINE__)
    126:     end

demodulize(s) click to toggle source

Removes the module part from the expression in the string

         # File lib/sequel/model/inflections.rb, line 129
    129:     def demodulize(s)
    130:       s = s.to_s
    131:       return s.demodulize if s.respond_to?(:demodulize)
    132:       s.gsub(DEMODULIZE_CONVERT_REGEXP, EMPTY_STRING)
    133:     end

pluralize(s) click to toggle source

Returns the plural form of the word in the string.

         # File lib/sequel/model/inflections.rb, line 136
    136:     def pluralize(s)
    137:       s = s.to_s
    138:       return s.pluralize if s.respond_to?(:pluralize)
    139:       result = s.dup
    140:       Inflections.plurals.each{|(rule, replacement)| break if result.gsub!(rule, replacement)} unless Inflections.uncountables.include?(s.downcase)
    141:       result
    142:     end

singularize(s) click to toggle source

The reverse of pluralize, returns the singular form of a word in a string.

         # File lib/sequel/model/inflections.rb, line 145
    145:     def singularize(s)
    146:       s = s.to_s
    147:       return s.singularize if s.respond_to?(:singularize)
    148:       result = s.dup
    149:       Inflections.singulars.each{|(rule, replacement)| break if result.gsub!(rule, replacement)} unless Inflections.uncountables.include?(s.downcase)
    150:       result
    151:     end

underscore(s) click to toggle source

The reverse of camelize. Makes an underscored form from the expression in the string. Also changes ’::’ to ’/’ to convert namespaces to paths.

         # File lib/sequel/model/inflections.rb, line 155
    155:     def underscore(s)
    156:       s = s.to_s
    157:       return s.underscore if s.respond_to?(:underscore)
    158:       s.gsub(UNDERSCORE_MODULE_REGEXP, SLASH).gsub(UNDERSCORE_CONVERT_REGEXP1, UNDERSCORE_CONVERT_REPLACE).
    159:         gsub(UNDERSCORE_CONVERT_REGEXP2, UNDERSCORE_CONVERT_REPLACE).tr(DASH, UNDERSCORE).downcase
    160:     end

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