Module: Ardm::ActiveRecord::PredicateBuilder::Rails4::ClassMethods

Defined in:
lib/ardm/active_record/predicate_builder/rails4.rb

Instance Method Summary collapse

Instance Method Details

#build_from_hash(klass, attributes, default_table) ⇒ Object 



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# File 'lib/ardm/active_record/predicate_builder/rails4.rb', line 39

def build_from_hash(klass, attributes, default_table)
  queries = []

  #
  # attributes {
  #   Ardm::Query::Operator(target: :attr, operator: :not) =>
  attributes.each do |column, value|
    table = default_table

    if value.is_a?(Hash)
      if value.empty?
        queries << '1=0'
      else
        table       = Arel::Table.new(column, default_table.engine)
        association = klass.reflect_on_association(column.to_sym)

        value.each do |k, v|
          queries.concat expand(association && association.klass, table, k, v)
        end
      end
    else
      if Ardm::Query::Operator === column
        column = column.target.to_s
        operator = column.operator
      else
        column = column.to_s
        operator = nil
      end

      if column.include?('.')
        table_name, column = column.split('.', 2)
        table = Arel::Table.new(table_name, default_table.engine)
      end

      queries.concat expand(klass, table, column, value)
    end
  end

  queries
end

#expand(klass, table, column, value) ⇒ Object 



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# File 'lib/ardm/active_record/predicate_builder/rails4.rb', line 80

def expand(klass, table, column, value)
  queries = []

  # Find the foreign key when using queries such as:
  # Post.where(author: author)
  #
  # For polymorphic relationships, find the foreign key and type:
  # PriceEstimate.where(estimate_of: treasure)
  if klass && value.is_a?(Base) && reflection = klass.reflect_on_association(column.to_sym)
    if reflection.polymorphic?
      queries << build(table[reflection.foreign_type], value.class.base_class)
    end

    column = reflection.foreign_key
  end

  queries << build(table[column], value)
  queries
end

#references(attributes) ⇒ Object 



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# File 'lib/ardm/active_record/predicate_builder/rails4.rb', line 100

def references(attributes)
  attributes.map do |key, value|
    if value.is_a?(Hash)
      key
    else
      key = key.to_s
      key.split('.').first if key.include?('.')
    end
  end.compact
end

#register_handler(klass, handler) ⇒ Object

Define how a class is converted to Arel nodes when passed to where. The handler can be any object that responds to call, and will be used for any value that === the class given. For example:

MyCustomDateRange = Struct.new(:start, :end)
handler = proc do |column, range|
  Arel::Nodes::Between.new(column,
    Arel::Nodes::And.new([range.start, range.end])
  )
end
ActiveRecord::PredicateBuilder.register_handler(MyCustomDateRange, handler)



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# File 'lib/ardm/active_record/predicate_builder/rails4.rb', line 122

def register_handler(klass, handler)
  handlers.unshift([klass, handler])
end

#resolve_column_aliases(klass, hash) ⇒ Object 



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# File 'lib/ardm/active_record/predicate_builder/rails4.rb', line 29

def resolve_column_aliases(klass, hash)
  hash = hash.dup
  hash.keys.grep(Symbol) do |key|
    if klass.attribute_alias? key
      hash[klass.attribute_alias(key)] = hash.delete key
    end
  end
  hash
end