README.md in armg-0.3.0 vs README.md in armg-0.4.0
- old
+ new
@@ -1,9 +1,10 @@
# Armg
Add MySQL geometry type to Active Record.
+[](https://badge.fury.io/rb/armg)
[](https://travis-ci.org/winebarrel/armg)
## Installation
Add this line to your application's Gemfile:
@@ -24,11 +25,11 @@
```ruby
require 'active_record'
require 'armg'
-ActiveRecord::Base.establish_connection(adapter: 'mysql2', database: 'my_db');
+ActiveRecord::Base.establish_connection(adapter: 'mysql2', database: 'my_db')
ActiveRecord::Migration.create_table :geoms, options: 'ENGINE=MyISAM' do |t|
t.geometry 'location', null: false
t.index ['location'], name: 'idx_location', type: :spatial
end
@@ -39,6 +40,51 @@
point = wkt_parser.parse('SRID=4326;Point(-122.1 47.3)')
Geom.create!(location: point)
Geom.first
#=> #<Geom id: 1, location: #<RGeo::Cartesian::PointImpl:0x... "POINT (-122.1 47.3)">>
+```
+
+## Using custom WKB parser
+
+```ruby
+class CustomParser
+ def initialize
+ factory = RGeo::Geographic.spherical_factory(srid: 0)
+ @parser = RGeo::WKRep::WKBParser.new(factory, support_ewkb: true)
+ end
+
+ def parse(wkb)
+ wkb_without_srid = wkb.bytes[4..-1].pack('c*')
+ @parser.parse(wkb_without_srid)
+ end
+end
+
+Armg.wkb_parser = CustomParser.new
+
+Geom.take
+#=> #<Geom id: 1, location: #<RGeo::Geographic::SphericalPointImpl:0x... "POINT (-122.1 47.3)">>
+```
+
+## Using custom WKB generator
+
+```ruby
+class CustomGenerator
+ def initialize
+ @wkt_parser = RGeo::WKRep::WKTParser.new(nil, support_ewkt: true)
+ @generator = RGeo::WKRep::WKBGenerator.new(type_format: :ewkb, little_endian: true)
+ end
+
+ def generate(value)
+ if value.is_a?(String)
+ value = @wkt_parser.parse(value)
+ end
+
+ srid = "\x00\x00\x00\x00"
+ srid + @generator.generate(value)
+ end
+end
+
+Armg.wkb_generator = CustomGenerator.new
+
+Geom.create!(id: 4, location: 'Point(-122.1 47.3)')
```