class Sequel::Postgres::PGRow::HashRow

Class for row-valued/composite types that are treated as hashes. Types registered via Database#register_row_type will use this class by default.

Attributes

columns[RW]

The columns associated with this class.

db_type[RW]

The database type for this class. May be nil if this class done not have a specific database type.

columns[W]

Sets the columns associated with this instance. This is used to override the class's default columns.

db_type[W]

Sets the database type associated with this instance. This is used to override the class's default database type.

Public Class Methods

subclass(db_type, columns) click to toggle source

Create a new subclass of this class with the given database type and columns.

    # File lib/sequel/extensions/pg_row.rb
162 def self.subclass(db_type, columns)
163   Class.new(self) do
164     @db_type = db_type
165     @columns = columns
166   end
167 end

Public Instance Methods

check_columns!() click to toggle source

Check that the HashRow has valid columns. This should be used before all attempts to literalize the object, since literalization depends on the columns to get the column order.

    # File lib/sequel/extensions/pg_row.rb
195 def check_columns!
196   if columns.nil? || columns.empty?
197     raise Error, 'cannot literalize HashRow without columns'
198   end
199 end
columns() click to toggle source

Return the instance's columns, or the class's columns if the instance has not overridden it.

    # File lib/sequel/extensions/pg_row.rb
182 def columns
183   @columns || self.class.columns
184 end
db_type() click to toggle source

Return the instance's database type, or the class's columns if the instance has not overridden it.

    # File lib/sequel/extensions/pg_row.rb
188 def db_type
189   @db_type || self.class.db_type
190 end
sql_literal_append(ds, sql) click to toggle source

Append SQL fragment related to this object to the sql.

    # File lib/sequel/extensions/pg_row.rb
202 def sql_literal_append(ds, sql)
203   check_columns!
204   sql << 'ROW'
205   ds.literal_append(sql, values_at(*columns))
206   if db_type
207     sql << '::'
208     ds.quote_schema_table_append(sql, db_type)
209   end
210 end