Class: ActiveRecordSpatial::SpatialFunction

Inherits:
Object
  • Object
show all
Defined in:
lib/activerecord-spatial/spatial_function.rb

Constant Summary collapse

DEFAULT_OPTIONS = 
{
  :column => ActiveRecordSpatial.default_column_name,
  :use_index => true
}.freeze

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(klass) ⇒ SpatialFunction

Returns a new instance of SpatialFunction.



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# File 'lib/activerecord-spatial/spatial_function.rb', line 9

def initialize(klass)
  @klass = klass
end

Class Method Details

.additional_ordering(*args) ⇒ Object 



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# File 'lib/activerecord-spatial/spatial_function.rb', line 180

def additional_ordering(*args)
  options = args.extract_options!

  desc = if args.first == :desc
    true
  else
    options[:desc]
  end

  ''.tap do |ret|
      if desc
        ret << ' DESC'
      end

      if options[:nulls]
        ret << " NULLS #{options[:nulls].to_s.upcase}"
      end
  end
end

.build!(klass, *args) ⇒ Object 



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# File 'lib/activerecord-spatial/spatial_function.rb', line 13

def self.build!(klass, *args)
  new(klass).build_function_call(*args)
end

Instance Method Details

#build_function_call(function, *args) ⇒ Object 



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# File 'lib/activerecord-spatial/spatial_function.rb', line 17

def build_function_call(function, *args)
  options = default_options(args.extract_options!)

  geom = options.fetch(:geom_arg, args.first)
  args = Array.wrap(options.fetch(:args, args.from(1)))

  column_name = self.column_name(options[:column])
  first_geom_arg = self.wrap_column_or_geometry(
    @klass.arel_table[column_name],
    options[:column]
  )
  geom_args = [ first_geom_arg ]

  if geom.present?
    column_type = @klass.spatial_column_by_name(column_name).spatial_type
    column_srid = @klass.srid_for(column_name)

    unless geom.is_a?(Hash)
      geom_arg = read_geos(geom, column_srid)
      geom_srid = read_geom_srid(geom_arg, column_type)
      geom_args << self.set_srid_or_transform(column_srid, geom_srid, geom_arg, column_type)
    else
      klass = if geom[:class]
        geom[:class]
      elsif geom[:class_name]
        geom[:class_name].classify.constantize
      else
        raise ArgumentError.new("Need either a :class or :class_name option to determine the class.")
      end

      if geom[:value]
        geom_arg = read_geos(geom[:value], column_srid)
        geom_srid = read_geom_srid(geom_arg, column_type)
      else
        geom_arg = geom
        geom_srid = klass.srid_for(self.column_name(geom[:column]))
      end

      transformed_geom = self.set_srid_or_transform(column_srid, geom_srid, geom_arg, column_type)
      geom_args << self.wrap_column_or_geometry(transformed_geom, geom)
    end
  end

  if options[:invert] && geom_args.length > 1
    geom_args.reverse!
  end

  ret = Arel::Nodes::NamedFunction.new(
    function_name(function, options[:use_index]),
    geom_args + args
  )

  if options[:allow_null]
    ret = ret.or(first_geom_arg.eq(nil))
  end

  ret
end