尝试使用RGeo Ruby gem导入shapefile,使Stack Level过深

时间:2015-03-23 20:49:10

标签: ruby postgis rgeo

我不知道这是我的代码中的某些交互,还是我使用的shapefile中的命名约定,但以下代码会生成Stack level too deep消息

def read_shapefile
  @shp_path = Dir[File.join( @tmp_path, '*.shp') ].first

  srs_database = RGeo::CoordSys::SRSDatabase::ActiveRecordTable.new

  factory = RGeo::Geos.factory(:srs_database => srs_database, :srid => 96805)
  #factory = RGeo::Geos::CAPIFactory.new
  cartesian_preferred_factory = LandUnit.rgeo_factory_for_column(:location)


  RGeo::Shapefile::Reader.open(@shp_path, factory: factory) do |file|
    file.each do |record|
      cartesian_cast = RGeo::Feature.cast(
          record.geometry, factory: cartesian_preferred_factory, project: true)

      cartesian_cast.each do |poly|
          lu = LandUnit.new
          lu.guid = record.attributes[@params['guid']].to_s
          lu.country_code =  @params['country_code']
          lu.location = poly    
          # error happens here!
          lu.save
      end
    end
  end
end

模型迁移:

class CreateLandUnits < ActiveRecord::Migration
  def change
    create_table :land_units do |t|
      t.string :country_code, null: false, index: true
      t.string :guid, index: true
      t.geometry :location, srid: 3785

      t.timestamps
    end
  end
end

schema.rb的相关部分:

  create_table "land_units", force: true do |t|
    t.string   "country_code",                                          null: false
    t.string   "guid"
    t.datetime "created_at"
    t.datetime "updated_at"
    t.spatial  "location",     limit: {:srid=>3785, :type=>"geometry"}
  end

  add_index "land_units", ["location"], :name => "index_land_units_on_location", :spatial => true

Backtrace指向active_record/transactions.rb,第286行:

def rollback_active_record_state!
  remember_transaction_record_state
  yield
rescue Exception
  restore_transaction_record_state
  raise    # HERE<<<
ensure
  clear_transaction_record_state
end

尝试了一切。任何帮助将不胜感激。

编辑:如果有人想知道这些参数,那么在失败的电话中他们会解决这个问题:&#39; 6020048.00&#39;和country_code:&#39; ca&#39;。

我还应该补充一下,日志显示了这个:

(0.1ms)  BEGIN
  SQL (0.6ms)  INSERT INTO "land_units" ("country_code", "created_at", "guid", "location", "updated_at") 
  VALUES ($1, $2, $3, $4, $5) RETURNING "id"  [["country_code", "ca"], ["created_at", "2015-03-23 20:59:38.771649"], ["guid", "6020048.00"], 
  ["location", "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"], ["updated_at", "2015-03-23 20:59:38.771649"
  ]]
   (0.2ms)  ROLLBACK

它显示的SQL在控制台中执行得很好!这是疯狂的一点。这告诉我,问题是一些before_save方法,但我还没有定义任何方法。

1 个答案:

答案 0 :(得分:0)

我想我可能已经弄明白了。此空间参考代码“96805”在spatialreference.org上没有任何条目。我不是说它不存在,但它可能在其他一些srid下引用。

你可以追踪它,我想它存在但是使用其他一些代码引用。通常,在多个SRID引用下引用相同的proj4代码。无论如何,对于这个神秘投影文件的一个shapefile集,请在文本编辑器中打开*.prj文件。这将显示您的proj4代码。你可以从这里处理这种多种方式。有一件事是你可以将这个proj4代码复制到google中并尝试获取它的官方srid,然后从那里开始。

或者,您可以直接使用proj4代码重新制作几何图形,而无需任何正式的srid。