Module: MapfishCoreExtensions::ActiveRecord::Base::ClassMethods

Defined in:
lib/mapfish_core_extensions/active_record/base.rb

Instance Method Summary collapse

Instance Method Details

#find_by_mapfish_filter(params, args = {}) ⇒ Object

Rails 2 backwards compatible finder



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# File 'lib/mapfish_core_extensions/active_record/base.rb', line 115

def find_by_mapfish_filter(params, args = {})
  filter = {}
  #Create geometry filter
  srid = geometry_column.srid
  pnt = nil
  pnt = Point.from_x_y(params['lon'].to_f, params['lat'].to_f, srid) if params['lon'] && params['lat']
  box = nil
  if pnt && params['tolerance']
    rad = params['tolerance'].to_f/2
    box = [[pnt.x+rad, pnt.y+rad], [pnt.x-rad, pnt.y-rad], srid]
  end
  if params['bbox']
    x1, y1, x2, y2 = params['bbox'].split(',').collect(&:to_f)
    box = [[x1, y1], [x2, y2], srid]
  end
  if box
    box3d = "'BOX3D(#{box[0].join(" ")},#{box[1].join(" ")})'::box3d"
    filter = "#{table_name}.#{connection.quote_column_name(geometry_column.name)} && SetSRID(#{box3d}, #{box[2] || DEFAULT_SRID} ) "
  end
  conditions = sanitize_sql_for_conditions(filter)

  #Add attribute filter
  attrfilter = []
  params.each do |key, value|
    next if value.nil? || !value.respond_to?(:empty?) || value.empty?
    field, op = key.split('__')
    case op
    when 'eq'
      attrfilter << ["#{field} = ?", value]
    when 'ne'
      attrfilter << ["#{field} <> ?", value]
    when 'lt'
      attrfilter << ["#{field} < ?", value]
    when 'lte'
      attrfilter << ["#{field} <= ?", value]
    when 'gt'
      attrfilter << ["#{field} > ?", value]
    when 'gte'
      attrfilter << ["#{field} >= ?", value]
    when 'ilike'
      #TODO: support wildcarded ILIKE: https://trac.mapfish.org/trac/mapfish/ticket/495
      attrfilter << ["#{field} ILIKE ?", value]
    end
  end
  unless attrfilter.empty?
    sql, sqlparams = attrfilter.transpose
    if conditions.nil?
      conditions = ''
    else
      conditions << " AND "
    end
    conditions << sanitize_sql_for_conditions([sql.join(' AND ')] + sqlparams)
  end

  #Create finder arguments
  args.merge!(:conditions => conditions)
  args.merge!({:limit => params['maxfeatures'] }) if params['maxfeatures']
  args.merge!({:limit => params['limit'] }) if params['limit']
  args.merge!(:offset => params['offset']) if params['offset']
  find(:all, args)
end

#geometry_column ⇒ Object 



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# File 'lib/mapfish_core_extensions/active_record/base.rb', line 53

def geometry_column
  #Returns first geometry column found. TODO: override by configuration (set_geometry_column)?
  @geometry_column ||= columns.detect {|col| col.respond_to?(:geometry_type) }
end

#mapfish_filter(params) ⇒ Object 



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# File 'lib/mapfish_core_extensions/active_record/base.rb', line 66

def mapfish_filter(params)
  filter = scoped

  #Create geometry filter
  srid = geometry_column.srid
  pnt = nil
  pnt = Point.from_x_y(params['lon'].to_f, params['lat'].to_f, srid) if params['lon'] && params['lat']
  box = nil
  if pnt && params['tolerance']
    rad = params['tolerance'].to_f/2
    box = [[pnt.x+rad, pnt.y+rad], [pnt.x-rad, pnt.y-rad], srid]
  end
  if params['bbox']
    x1, y1, x2, y2 = params['bbox'].split(',').collect(&:to_f)
    box = [[x1, y1], [x2, y2], srid]
  end
  if box
    box3d = "'BOX3D(#{box[0].join(" ")},#{box[1].join(" ")})'::box3d"
    filter = filter.where("#{table_name}.#{connection.quote_column_name(geometry_column.name)} && SetSRID(#{box3d}, #{box[2] || DEFAULT_SRID} ) ")
  end

  #Add attribute filter
  params.each do |key, value|
    next if value.nil? || !value.respond_to?(:empty?) || value.empty?
    field, op = key.split('__')
    col = "#{table_name}.#{connection.quote_column_name(field)}"
    case op
    when 'eq'
      filter = filter.where("#{col} = ?", value)
    when 'ne'
      filter = filter.where("#{col} <> ?", value)
    when 'lt'
      filter = filter.where("#{col} < ?", value)
    when 'lte'
      filter = filter.where("#{col} <= ?", value)
    when 'gt'
      filter = filter.where("#{col} > ?", value)
    when 'gte'
      filter = filter.where("#{col} >= ?", value)
    when 'ilike'
      #TODO: support wildcarded ILIKE: https://trac.mapfish.org/trac/mapfish/ticket/495
      filter = filter.where("#{col} ILIKE ?", value)
    end
  end

  filter
end

#params_from_geojson(geoson) ⇒ Object 



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# File 'lib/mapfish_core_extensions/active_record/base.rb', line 58

def params_from_geojson(geoson)
  name = self.to_s.downcase #unless geoson.is_a?(Array)
  data = geoson.delete(:properties) || {}
  data[geometry_column.name] = Geometry.from_geojson(geoson.delete(:geometry), geometry_column.srid)
  geoson.delete(:type)
  {name => data, primary_key => geoson.delete(:id)}
end