Class: ActiveRecord::ConnectionAdapters::PostgreSQLMaterializedViewAlterer

Inherits:
Object
  • Object
show all
Includes:
PostgreSQLExtensions::Utils
Defined in:
lib/active_record/postgresql_extensions/materialized_views.rb

Overview

Alters a PostgreSQL materialized view definition. This class isn’t really meant to be used directly. Instead, see the various PostgreSQLAdapter materialied views methods for usage.

Constant Summary collapse

VALID_OPTIONS = 
%w{
  set_default
  drop_default
  owner_to
  rename_to
  set_schema
  set_options
  reset_options
  cluster_on
  remove_cluster
}.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from PostgreSQLExtensions::Utils

#hash_or_array_of_hashes, #options_from_hash_or_string, #strip_heredoc

Constructor Details

#initialize(base, name, actions, options = {}) ⇒ PostgreSQLMaterializedViewAlterer

:nodoc:



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# File 'lib/active_record/postgresql_extensions/materialized_views.rb', line 206

def initialize(base, name, actions, options = {}) #:nodoc:
  @base, @name, @actions, @options = base, name, actions, options
end

Instance Attribute Details

#actions ⇒ Object

Returns the value of attribute actions.



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# File 'lib/active_record/postgresql_extensions/materialized_views.rb', line 192

def actions
  @actions
end

#base ⇒ Object

Returns the value of attribute base.



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# File 'lib/active_record/postgresql_extensions/materialized_views.rb', line 192

def base
  @base
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/active_record/postgresql_extensions/materialized_views.rb', line 192

def name
  @name
end

#options ⇒ Object

Returns the value of attribute options.



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# File 'lib/active_record/postgresql_extensions/materialized_views.rb', line 192

def options
  @options
end

Instance Method Details

#to_sql ⇒ Object

:nodoc:



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# File 'lib/active_record/postgresql_extensions/materialized_views.rb', line 210

def to_sql #:nodoc:
  all_sql = []

  VALID_OPTIONS.each do |key|
    key = key.to_sym

    if actions.key?(key)
      sql = "ALTER MATERIALIZED VIEW "
      sql << "IF EXISTS " if options[:if_exists]
      sql << "#{base.quote_view_name(name)} "

      sql << case key
        when :set_default
          expression = if actions[:set_default].is_a?(Hash) && actions[:set_default].key?(:expression)
             actions[:set_default][:expression]
          else
            base.quote(actions[:set_default])
          end

          "ALTER COLUMN #{base.quote_column_name(actions[:column])} SET DEFAULT #{expression}"

        when :drop_default
          "ALTER COLUMN #{base.quote_column_name(actions[:drop_default])} DROP DEFAULT"

        when :owner_to
          "OWNER TO #{base.quote_role(actions[:owner_to])}"

        when :rename_to
          "RENAME TO #{base.quote_generic_ignore_scoped_schema(actions[:rename_to])}"

        when :set_schema
          "SET SCHEMA #{base.quote_schema(actions[:set_schema])}"

        when :set_options
          ActiveRecord::PostgreSQLExtensions::Features.check_feature(:view_set_options)

          "SET (#{options_from_hash_or_string(actions[:set_options])})" if actions[:set_options].present?

        when :reset_options
          ActiveRecord::PostgreSQLExtensions::Features.check_feature(:view_set_options)

          'RESET (' << Array.wrap(actions[:reset_options]).collect { |value|
            base.quote_generic(value)
          }.join(", ") << ')'

        when :cluster_on
          "CLUSTER ON #{base.quote_generic(actions[:cluster_on])}"

        when :remove_cluster
          next unless actions[:remove_cluster]

          "SET WITHOUT CLUSTER"
      end

      all_sql << "#{sql};"
    end
  end

  all_sql.join("\n")
end