Class: ActiveRecord::Relation

Inherits:
Object
  • Object
show all
Defined in:
lib/composite_primary_keys/relation.rb

Instance Method Summary collapse

Constructor Details

#initialize(klass, table, values = {}) ⇒ Relation

Returns a new instance of Relation.



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# File 'lib/composite_primary_keys/relation.rb', line 4

def initialize(klass, table, values = {})
  initialize_without_cpk(klass, table, values)
  add_cpk_support if klass && klass.composite?
  add_cpk_where_values_hash
end

Instance Method Details

#_update_record(values, id, id_was) ⇒ Object 



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# File 'lib/composite_primary_keys/relation.rb', line 88

def _update_record(values, id, id_was)
  substitutes, binds = substitute_values values

  # CPK
  um = if self.composite?
    relation = @klass.unscoped.where(cpk_id_predicate(@klass.arel_table, @klass.primary_key, id_was || id))
    relation.arel.compile_update(substitutes, @klass.primary_key)
  else
    @klass.unscoped.where(@klass.arel_table[@klass.primary_key].eq(id_was || id)).arel.compile_update(substitutes, @klass.primary_key)
  end

  @klass.connection.update(
    um,
    'SQL',
    binds)
end

#add_cpk_support ⇒ Object 



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# File 'lib/composite_primary_keys/relation.rb', line 16

def add_cpk_support
  class << self
    include CompositePrimaryKeys::ActiveRecord::Batches
    include CompositePrimaryKeys::ActiveRecord::Calculations
    include CompositePrimaryKeys::ActiveRecord::FinderMethods
    include CompositePrimaryKeys::ActiveRecord::QueryMethods

    def delete(id_or_array)
      # CPK
      if self.composite?
        id_or_array = if id_or_array.is_a?(CompositePrimaryKeys::CompositeKeys)
                        [id_or_array]
                      else
                        Array(id_or_array)
                      end

        id_or_array.each do |id|
          # Is the passed in id actually a record?
          id = id.kind_of?(ActiveRecord::Base) ? id.id : id
          where(cpk_id_predicate(table, self.primary_key, id)).delete_all
        end
      else
        where(primary_key => id_or_array).delete_all
      end
    end

    def destroy(id_or_array)
      # Without CPK:
      #if id.is_a?(Array)
      #  id.map { |one_id| destroy(one_id) }
      #else
      #  find(id).destroy
      #end

      id_or_array = if id_or_array.kind_of?(CompositePrimaryKeys::CompositeKeys)
        [id_or_array]
      else
        Array(id_or_array)
      end

      id_or_array.each do |id|
        where(cpk_id_predicate(table, self.primary_key, id)).each do |record|
          record.destroy
        end
      end
    end
  end
end

#add_cpk_where_values_hash ⇒ Object 



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# File 'lib/composite_primary_keys/relation.rb', line 65

def add_cpk_where_values_hash
  class << self
    def where_values_hash(relation_table_name = table_name)
      # CPK adds this so that it finds the Equality nodes beneath the And node:
      #equalities = where_values.grep(Arel::Nodes::Equality).find_all { |node|
      #  node.left.relation.name == table_name
      # }
      nodes_from_and = where_values.grep(Arel::Nodes::And).map {|and_node| and_node.children.grep(Arel::Nodes::Equality) }.flatten

      equalities = (nodes_from_and + where_values.grep(Arel::Nodes::Equality)).find_all { |node|
        node.left.relation.name == relation_table_name
      }

      binds = Hash[bind_values.find_all(&:first).map { |column, v| [column.name, v] }]

      Hash[equalities.map { |where|
        name = where.left.name
        [name, binds.fetch(name.to_s) { where.right }]
      }]
    end
  end
end

#initialize_copy(other) ⇒ Object 



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# File 'lib/composite_primary_keys/relation.rb', line 11

def initialize_copy(other)
  initialize_copy_without_cpk(other)
  add_cpk_support if klass.composite?
end

#initialize_copy_without_cpk ⇒ Object 



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# File 'lib/composite_primary_keys/relation.rb', line 10

alias :initialize_copy_without_cpk :initialize_copy

#initialize_without_cpk ⇒ Object 



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# File 'lib/composite_primary_keys/relation.rb', line 3

alias :initialize_without_cpk :initialize