Module: Torque::PostgreSQL::Reflection::AbstractReflection

Defined in:
lib/torque/postgresql/reflection/abstract_reflection.rb

Constant Summary collapse

AREL_ATTR = 
::Arel::Attributes::Attribute
ARR_NO_CAST = 
'bigint'
ARR_CAST = 
'bigint[]'

Instance Method Summary collapse

Instance Method Details

#build_id_constraint(klass_attr, source_attr) ⇒ Object

Build the id constraint checking if both types are perfect matching



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# File 'lib/torque/postgresql/reflection/abstract_reflection.rb', line 44

def build_id_constraint(klass_attr, source_attr)
  return klass_attr.eq(source_attr) unless connected_through_array?

  # Klass and key are associated with the reflection Class
  klass_type = klass.columns_hash[join_keys.key.to_s]
  # active_record and foreign_key are associated with the source Class
  source_type = active_record.columns_hash[join_keys.foreign_key.to_s]

  # If both are attributes but the left side is not an array, and the
  # right side is, use the ANY operation
  any_operation = arel_array_to_any(klass_attr, source_attr, klass_type, source_type)
  return klass_attr.eq(any_operation) if any_operation

  # If the left side is not an array, just use the IN condition
  return klass_attr.in(source_attr) unless klass_type.try(:array)

  # Decide if should apply a cast to ensure same type comparision
  should_cast = klass_type.type.eql?(:integer) && source_type.type.eql?(:integer)
  should_cast &= !klass_type.sql_type.eql?(source_type.sql_type)
  should_cast |= !(klass_attr.is_a?(AREL_ATTR) && source_attr.is_a?(AREL_ATTR))

  # Apply necessary transformations to values
  klass_attr = cast_constraint_to_array(klass_type, klass_attr, should_cast)
  source_attr = cast_constraint_to_array(source_type, source_attr, should_cast)

  # Return the overlap condition
  klass_attr.overlaps(source_attr)
end

#build_join_constraint(table, foreign_table) ⇒ Object

Manually build the join constraint



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# File 'lib/torque/postgresql/reflection/abstract_reflection.rb', line 35

def build_join_constraint(table, foreign_table)
  result = build_id_constraint_between(table, foreign_table)
  result = table.create_and([result, klass.send(:type_condition, table)]) \
    if klass.finder_needs_type_condition?

  result
end

#connected_through_array? ⇒ Boolean

Check if the foreign key actually exists

Returns:

  • (Boolean) 


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# File 'lib/torque/postgresql/reflection/abstract_reflection.rb', line 13

def connected_through_array?
  false
end

#join_keys ⇒ Object

TODO: Deprecate this method



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# File 'lib/torque/postgresql/reflection/abstract_reflection.rb', line 75

def join_keys
  OpenStruct.new(key: join_primary_key, foreign_key: join_foreign_key)
end

#join_scope(table, foreign_table, foreign_klass) ⇒ Object

Fix where the join_scope method is the one now responsible for building the join condition



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# File 'lib/torque/postgresql/reflection/abstract_reflection.rb', line 19

def join_scope(table, foreign_table, foreign_klass)
  return super unless connected_through_array?

  predicate_builder = predicate_builder(table)
  scope_chain_items = join_scopes(table, predicate_builder)
  klass_scope       = klass_join_scope(table, predicate_builder)

  klass_scope.where!(build_id_constraint_between(table, foreign_table))
  klass_scope.where!(type => foreign_klass.polymorphic_name) if type
  klass_scope.where!(klass.send(:type_condition, table)) \
    if klass.finder_needs_type_condition?

  scope_chain_items.inject(klass_scope, &:merge!)
end