Class: BigRecord::ArAssociations::ClassMethods::JoinDependency::JoinBase

Inherits:

Object

• Object
• BigRecord::ArAssociations::ClassMethods::JoinDependency::JoinBase

show all

Defined in:

lib/big_record/ar_associations.rb

Overview

Instance Attribute Summary

• - (Object) active_record readonly

  Returns the value of attribute active_record.

• - (Object) table_joins readonly

  Returns the value of attribute table_joins.

Instance Method Summary

• - (Object) aliased_prefix
• - (Object) aliased_primary_key
• - (Object) aliased_table_name
• - (Object) column_names_with_alias
• - (Object) extract_record(row)
• - (JoinBase) initialize(active_record, joins = nil) constructor

  A new instance of JoinBase.

• - (Object) instantiate(row)
• - (Object) record_id(row)

1389
1390
1391
1392
1393

# File 'lib/big_record/ar_associations.rb', line 1389

def initialize(active_record, joins = nil)
  @active_record = active_record
  @cached_record = {}
  @table_joins   = joins
end

1386
1387
1388

# File 'lib/big_record/ar_associations.rb', line 1386

def active_record
  @active_record
end

1386
1387
1388

# File 'lib/big_record/ar_associations.rb', line 1386

def table_joins
  @table_joins
end

1395
1396
1397

# File 'lib/big_record/ar_associations.rb', line 1395

def aliased_prefix
  "t0"
end

1399
1400
1401

# File 'lib/big_record/ar_associations.rb', line 1399

def aliased_primary_key
  "#{ aliased_prefix }_r0"
end

1403
1404
1405

# File 'lib/big_record/ar_associations.rb', line 1403

def aliased_table_name
  active_record.table_name
end

1407
1408
1409
1410
1411
1412
1413
1414
1415

# File 'lib/big_record/ar_associations.rb', line 1407

def column_names_with_alias
  unless @column_names_with_alias
    @column_names_with_alias = []
    ([primary_key] + (column_names - [primary_key])).each_with_index do |column_name, i|
      @column_names_with_alias << [column_name, "#{ aliased_prefix }_r#{ i }"]
    end
  end
  return @column_names_with_alias
end

1417
1418
1419

# File 'lib/big_record/ar_associations.rb', line 1417

def extract_record(row)
  column_names_with_alias.inject({}){|record, (cn, an)| record[cn] = row[an]; record}
end

1425
1426
1427

# File 'lib/big_record/ar_associations.rb', line 1425

def instantiate(row)
  @cached_record[record_id(row)] ||= active_record.instantiate(extract_record(row))
end

1421
1422
1423

# File 'lib/big_record/ar_associations.rb', line 1421

def record_id(row)
  row[aliased_primary_key]
end