Class: Sequel::Postgres::PGArray

### Home Classes Methods

### In Files

- lib/sequel/extensions/pg_array.rb
- lib/sequel/extensions/pg_array_ops.rb

### Parent

DelegateClass(Array)

### Namespace

- MODULE Sequel::Postgres::PGArray::DatabaseMethods
- CLASS Sequel::Postgres::PGArray::Creator
- CLASS Sequel::Postgres::PGArray::JSONCreator
- CLASS Sequel::Postgres::PGArray::Parser

### Methods

- ::new
- ::register
- #op
- #sql_literal_append

### Included Modules

- Sequel::SQL::AliasMethods

### Files

- CHANGELOG
- MIT-LICENSE
- README.rdoc
- active_record.rdoc
- advanced_associations.rdoc
- association_basics.rdoc
- bin_sequel.rdoc
- cheat_sheet.rdoc
- code_order.rdoc
- core_extensions.rdoc
- dataset_basics.rdoc
- dataset_filtering.rdoc
- extensions.rdoc
- mass_assignment.rdoc
- migration.rdoc
- model_hooks.rdoc
- model_plugins.rdoc
- object_model.rdoc
- opening_databases.rdoc
- postgresql.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
- 3.34.0.txt
- 3.35.0.txt
- 3.36.0.txt
- 3.37.0.txt
- 3.38.0.txt
- 3.39.0.txt
- 3.4.0.txt
- 3.40.0.txt
- 3.41.0.txt
- 3.42.0.txt
- 3.43.0.txt
- 3.44.0.txt
- 3.45.0.txt
- 3.46.0.txt
- 3.47.0.txt
- 3.48.0.txt
- 3.5.0.txt
- 3.6.0.txt
- 3.7.0.txt
- 3.8.0.txt
- 3.9.0.txt
- 4.0.0.txt
- 4.1.0.txt
- 4.2.0.txt
- 4.3.0.txt
- 4.4.0.txt
- 4.5.0.txt
- schema_modification.rdoc
- security.rdoc
- sharding.rdoc
- sql.rdoc
- testing.rdoc
- thread_safety.rdoc
- transactions.rdoc
- validations.rdoc
- virtual_rows.rdoc

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# Sequel::Postgres::PGArray

Represents a PostgreSQL array column value.

### Constants

ARRAY
ARRAY_TYPES

  Global hash of database array type name strings to symbols (e.g. 'double precision' => :float), used by the schema parsing for array types registered globally.

BACKSLASH
CLOSE_BRACE
CLOSE_BRACKET
COMMA
DOUBLE_COLON
EMPTY_ARRAY
EMPTY_BRACKET
EMPTY_STRING
NULL
OPEN_BRACE
OPEN_BRACKET
QUOTE

### Attributes

array_type[RW]

The type of this array. May be nil if no type was given. If a type is provided, the array is automatically casted to this type when literalizing. This type is the underlying type, not the array type itself, so for an int4[] database type, it should be :int4 or 'int4'

### Public Class Methods

new(array, type=nil) click to toggle source

Set the array to delegate to, and a database type.

    # File lib/sequel/extensions/pg_array.rb, line 516
    def initialize(array, type=nil)
      super(array)
      @array_type = type
    end

register(db_type, opts=OPTS, &block) click to toggle source

Registers an array type that the extension should handle. Makes a Database instance that has been extended with DatabaseMethods recognize the array type given and set up the appropriate typecasting. Also sets up automatic typecasting for the native postgres adapter, so that on retrieval, the values are automatically converted to PGArray instances. The db_type argument should be the exact database type used (as returned by the PostgreSQL format_type database function). Accepts the following options:

:array_type | The type to automatically cast the array to when literalizing the array. Usually the same as db_type.
:converter | A callable object (e.g. Proc), that is called with each element of the array (usually a string), and should return the appropriate typecasted object.
:oid | The PostgreSQL OID for the array type. This is used by the Sequel postgres adapter to set up automatic type conversion on retrieval from the database.
:parser | Can be set to :json to use the faster JSON-based parser. Note that the JSON-based parser can only correctly handle integers values correctly. It doesn't handle full precision for numeric types, and doesn't handle NaN/Infinity values for floating point types.
:scalar_oid | Should be the PostgreSQL OID for the scalar version of this array type. If given, automatically sets the :converter option by looking for scalar conversion proc.
:scalar_typecast | Should be a symbol indicating the typecast method that should be called on each element of the array, when a plain array is passed into a database typecast method. For example, for an array of integers, this could be set to :integer, so that the typecast_value_integer method is called on all of the array elements. Defaults to :type_symbol option.
:type_procs | A hash mapping oids to conversion procs, used for looking up the :scalar_oid and value and setting the :oid value. Defaults to the global Sequel::Postgres::PG_TYPES.
:type_symbol | The base of the schema type symbol for this type. For example, if you provide :integer, Sequel will recognize this type as :integer_array during schema parsing. Defaults to the db_type argument.
:typecast_method | If given, specifies the :type_symbol option, but additionally causes no typecasting method to be created in the database. This should only be used to alias existing array types. For example, if there is an array type that can be treated just like an integer array, you can do :typecast_method=>:integer.
:typecast_method_map | The map in which to place the database type string to type symbol mapping. Defaults to ARRAY_TYPES.
:typecast_methods_module | If given, a module object to add the typecasting method to. Defaults to DatabaseMethods.

If a block is given, it is treated as the :converter option.

    # File lib/sequel/extensions/pg_array.rb, line 172
    def self.register(db_type, opts=OPTS, &block)
      db_type = db_type.to_s
      typecast_method = opts[:typecast_method]
      type = (typecast_method || opts[:type_symbol] || db_type).to_sym
      type_procs = opts[:type_procs] || PG_TYPES
      mod = opts[:typecast_methods_module] || DatabaseMethods
      typecast_method_map = opts[:typecast_method_map] || ARRAY_TYPES

      if converter = opts[:converter]
        raise Error, "can't provide both a block and :converter option to register" if block
      else
        converter = block
      end

      if soid = opts[:scalar_oid]
        raise Error, "can't provide both a converter and :scalar_oid option to register" if converter
        raise Error, "no conversion proc for :scalar_oid=>#{soid.inspect}" unless converter = type_procs[soid]
      end

      array_type = (opts[:array_type] || db_type).to_s.dup.freeze
      creator = (opts[:parser] == :json ? JSONCreator : Creator).new(array_type, converter)

      typecast_method_map[db_type] = :"#{type}_array"

      define_array_typecast_method(mod, type, creator, opts.fetch(:scalar_typecast, type)) unless typecast_method

      if oid = opts[:oid]
        type_procs[oid] = creator
      end

      nil
    end

### Public Instance Methods

op() click to toggle source

Wrap the PGArray instance in an ArrayOp, allowing you to easily use the PostgreSQL array functions and operators with literal arrays.

    # File lib/sequel/extensions/pg_array_ops.rb, line 266
    def op
      ArrayOp.new(self)
    end

sql_literal_append(ds, sql) click to toggle source

Append the array SQL to the given sql string. If the receiver has a type, add a cast to the database array type.

    # File lib/sequel/extensions/pg_array.rb, line 524
    def sql_literal_append(ds, sql)
      at = array_type
      if empty? && at
        sql << EMPTY_ARRAY
      else
        sql << ARRAY
        _literal_append(sql, ds, to_a)
      end
      if at
        sql << DOUBLE_COLON << at.to_s << EMPTY_BRACKET
      end
    end

[Validate]

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