Module: Raspy

Extended by:
Rusql
Defined in:
lib/raspy/error.rb,
lib/raspy/version.rb,
lib/raspy.rb

Defined Under Namespace

Classes: Error

Constant Summary collapse

VERSION = 
"1.0.3"

Class Method Summary collapse

Class Method Details

.preload_belongs_to(list:, name:, association_klass:, foreign_key:, inner_associations: nil, association_condition: nil, additional_selects: [], additional_joins: []) ⇒ Object 



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# File 'lib/raspy.rb', line 177

def self.preload_belongs_to(list:, name:, association_klass:, foreign_key:, inner_associations: nil, association_condition: nil, additional_selects: [], additional_joins: [])
  return if list.nil? || list.length == 0

  klass = list.first.class
  klass.send :attr_reader, name.to_sym

  return if list.map{ |e| e[foreign_key.to_sym] }.compact.length == 0

  association_table = association_klass.as_rusql_table

  selects = [association_table[:*]]
  selects += additional_selects

  condition = association_table[association_klass.primary_key.to_sym].in( list.map{ |e| e[foreign_key.to_sym] }.compact )

  unless association_condition.nil?
    condition = condition.and( association_condition )
  end

  query = select( *selects ).
    from( association_table ).
    where( condition )

  additional_joins.each do |j|
    query = query.join(j)
  end

  unless additional_selects.length == 0 && additional_joins.length == 0
    query = query.group_by( association_table[association_klass.primary_key.to_sym] )
  end

  associated_objects = association_klass.find_by_sql(query.to_s).to_a
  if inner_associations.present?
    associated_objects.prefetch(inner_associations)
  end

  associated_objects_hash = associated_objects.map{ |e| [e[association_klass.primary_key.to_sym], e] }.to_h

  list.each do |ele|
    if associated_objects_hash[ele[foreign_key.to_sym]].present?
      ele.instance_variable_set(:"@#{name}", associated_objects_hash[ele[foreign_key.to_sym]])
    end
  end
end

.preload_habtm(list:, name:, association_klass:, foreign_key:, association_foreign_key:, inner_associations:, join_table:, association_condition:) ⇒ Object 



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# File 'lib/raspy.rb', line 21

def self.preload_habtm(list:, name:, association_klass:, foreign_key:, association_foreign_key:, inner_associations:, join_table:, association_condition:)
  return if list.nil? || list.length == 0

  klass = list.first.class
  klass.send :attr_reader, name.to_sym

  join_t = table(join_table.to_sym)

  join_query = select(
    join_t[foreign_key.to_sym],
    join_t[association_foreign_key.to_sym]
  ).
  from( join_t ).
  where(
    join_t[foreign_key.to_sym].in( list.map{ |e| e[klass.primary_key.to_sym] }.compact )
  )

  join_objects = ActiveRecord::Base.connection.execute(join_query.to_s).to_a

  association_table  = association_klass.as_rusql_table

  condition = join_t[foreign_key.to_sym].in( list.map{ |e| e[klass.primary_key.to_sym] }.compact )
  if association_condition.present?
    condition = condition.and( association_condition )
  end

  query = select(
    association_table[:*]
  ).
  from( association_table ).
  inner_join( join_t, join_t[association_foreign_key.to_sym].equals(association_table[association_klass.primary_key.to_sym]) ).
  where(
    condition
  )

  associated_objects = association_klass.find_by_sql(query.to_s).to_a

  if inner_associations.present?
    associated_objects.prefetch(inner_associations)
  end

  associated_objects_hash = {}

  associated_objects_hash = associated_objects.map{ |e| [e[association_klass.primary_key.to_sym], e] }.to_h

  list.each do |ele|
    set = []

    join_objects.select{ |e| e[0] == ele[klass.primary_key.to_sym] }.map(&:last).each do |association_pk|
      if associated_objects_hash[association_pk].present?
        set << associated_objects_hash[association_pk]
      end
    end

    ele.instance_variable_set(:"@#{name}", set)
  end
end

.preload_has_many(list:, name:, association_klass:, foreign_key:, inner_associations: nil, association_condition: nil, reverse_association: nil) ⇒ Object 



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# File 'lib/raspy.rb', line 79

def self.preload_has_many(list:, name:, association_klass:, foreign_key:, inner_associations: nil, association_condition: nil, reverse_association: nil)
  return if list.nil? || list.length == 0

  klass = list.first.class
  klass.send :attr_reader, name.to_sym

  if reverse_association.present?
    association_klass.send :attr_reader, reverse_association.to_sym
  end

  association_table = association_klass.as_rusql_table

  condition = association_table[foreign_key.to_sym].in( list.map{ |e| e[klass.primary_key.to_sym] }.compact )
  if association_condition.present?
    condition = condition.and( association_condition )
  end

  query = select(
    association_table[:*]
  ).
  from( association_table ).
  where(
    condition
  )

  associated_objects = association_klass.find_by_sql(query.to_s).to_a
  if inner_associations.present?
    associated_objects.prefetch(inner_associations)
  end

  associated_objects_hash = {}
  associated_objects.each do |ao|
    associated_objects_hash[ao[foreign_key.to_sym]] ||= []
    associated_objects_hash[ao[foreign_key.to_sym]] << ao
  end

  list.each do |ele|
    set = []

    if associated_objects_hash[ele[klass.primary_key.to_sym]].present?
      set = associated_objects_hash[ele[klass.primary_key.to_sym]]
    end

    if reverse_association.present?
      set.each do |ao|
        ao.instance_variable_set(:"@#{reverse_association}", ele)
      end
    end

    ele.instance_variable_set(:"@#{name}", set)
  end
end

.preload_has_one(list:, name:, association_klass:, foreign_key:, order_type:, order_field:, inner_associations: nil, association_condition: nil, reverse_association: nil) ⇒ Object 



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# File 'lib/raspy.rb', line 132

def self.preload_has_one(list:, name:, association_klass:, foreign_key:, order_type:, order_field:, inner_associations: nil, association_condition: nil, reverse_association: nil)
  return if list.nil? || list.length == 0

  klass = list.first.class
  klass.send :attr_reader, name.to_sym

  if reverse_association.present?
    association_klass.send :attr_reader, reverse_association.to_sym
  end

  query = <<-EOS.squish

  SELECT
    #{ association_klass.table_name }.*
  FROM #{ association_klass.table_name }
  INNER JOIN (
    SELECT #{ association_klass.table_name }.#{ foreign_key }, #{ order_type }(#{ association_klass.table_name }.#{ order_field }) max_#{ order_field }
    FROM #{ association_klass.table_name }
    WHERE #{ association_klass.table_name }.#{ foreign_key } IN (#{ list.map{ |e| e[klass.primary_key.to_sym] }.compact.map(&:to_s).join(", ") })
      #{ association_condition.present? ? " AND #{ association_condition }" : "" }
    GROUP BY #{ association_klass.table_name }.#{ foreign_key }
  ) _association ON _association.#{ foreign_key } = #{ association_klass.table_name }.#{ foreign_key } AND _association.max_#{ order_field } = #{ association_klass.table_name }.#{ order_field }
  WHERE #{ association_klass.table_name }.#{ foreign_key } IN (#{ list.map{ |e| e[klass.primary_key.to_sym] }.compact.map(&:to_s).join(", ") })
    #{ association_condition.present? ? " AND #{ association_condition }" : "" }

  EOS

  associated_objects = association_klass.find_by_sql(query).to_a
  if inner_associations.present?
    associated_objects.prefetch(inner_associations)
  end

  associated_objects_hash = associated_objects.map{ |e| [e[foreign_key.to_sym], e] }.to_h

  list.each do |ele|
    if associated_objects_hash[ele[klass.primary_key.to_sym]].present?
      associated_object = associated_objects_hash[ele[klass.primary_key.to_sym]]
      if reverse_association.present?
        associated_object.instance_variable_set(:"@#{reverse_association}", ele)
      end
      ele.instance_variable_set(:"@#{name}", associated_object)
    end
  end
end

.preload_polymorphic_belongs_to(list:, name:, polymorphic_key_field:, polymorphic_type_field:, polymorphic_type_map:) ⇒ Object 



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# File 'lib/raspy.rb', line 222

def self.preload_polymorphic_belongs_to(list:, name:, polymorphic_key_field:, polymorphic_type_field:, polymorphic_type_map:)
  return if list.nil? || list.length == 0

  return if polymorphic_key_field.nil? || polymorphic_type_field.nil? || polymorphic_type_map.nil? || (polymorphic_type_map.keys.length == 0)

  klass = list.first.class
  klass.send :attr_reader, name.to_sym

  polymorphic_type_map.keys.each do |polymorphic_type|
    matching_list = list.select{ |e| e[polymorphic_type_field.to_sym] == polymorphic_type }
    association_klass = polymorphic_type_map[polymorphic_type]
    Raspy.preload_belongs_to(
      list:              matching_list,
      name:              name,
      association_klass: association_klass,
      foreign_key:       polymorphic_key_field
    )
  end
end