Module: Sequel::Extensions::Combine

Defined in:
lib/sequel/extensions/combine.rb

Constant Summary collapse

ALLOWED_TYPES = 
%i[many one].freeze
AGGREGATED_ROW_ALIAS = 
:ROW

Instance Method Summary collapse

Instance Method Details

#combine(options) ⇒ Object

Raises:

  • (Sequel::DatabaseError) 


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# File 'lib/sequel/extensions/combine.rb', line 11

def combine(options)
  raise Sequel::DatabaseError, "Invalid adapter. PostgreSQL driver not found." unless Sequel::Postgres::USES_PG
  
  column_mappings = options.map { |type, relations| combine_columns(type, relations) }
  column_mapping = column_mappings.reduce({}, :merge)
  select_append do
    column_mapping.map { |column_name, query| query.as(column_name.to_sym) }
  end
end