Fix bug with saving binary column incorrectly

Rakefile

@@ -51,6 +51,7 @@ namespace :turntable do
         ActiveRecord::Base.connection.create_table :users do |t|
           t.string :nickname
           t.string :thumbnail_url
+          t.binary :blob
           t.datetime :joined_at
           t.datetime :deleted_at
           t.timestamps

lib/active_record/turntable/mixer.rb

@@ -214,7 +214,7 @@ def build_insert_fader(tree, method, query, *args, &block)
         tree.values = [[SQLTree::Node::Expression::Variable.new("\\0")]]
         sql = tree.to_sql
         value_sql = vs.map do |val|
-          "(#{val.map { |v| @proxy.connection.quote(v.value)}.join(', ')})"
+          "(#{val.map { |v| "#{v.escape}#{@proxy.connection.quote(v.value)}" }.join(', ')})"
         end.join(', ')
         sql.gsub!('("\0")') { value_sql }
         shards_with_query[@proxy.cluster.shard_for(k)] = sql

lib/active_record/turntable/sql_tree_patch.rb

@@ -208,6 +208,10 @@ def to_sql(options = {})
       end
     end
 
+    class Value
+      leaf :escape
+    end
+
     class EscapedValue < Value
       def initialize(value, escape = nil)
         @value = value

spec/active_record/turntable/active_record_ext/persistence_spec.rb

@@ -35,6 +35,20 @@
     Card.create!(:name => 'foobar')
   }
 
+  context "When creating record" do
+    context "with blob column" do
+      let(:blob_value) { "\123\123\123" }
+      let(:user) {
+        u = User.new(:nickname => 'x', :blob => blob_value )
+        u.id = 1
+        u.save
+        u
+      }
+      subject { user }
+      its(:blob) { is_expected.to eq(user.reload.blob) }
+    end
+  end
+
   context "When the model is sharded by surrogate key" do
     it "should not changed from normal operation when updating" do
       user.nickname = "fizzbuzz"

spec/migrations/001_create_users.rb

@@ -3,6 +3,7 @@ def self.up
     create_table :users do |t|
       t.string :nickname
       t.string :thumbnail_url
+      t.binary :blob
       t.datetime :joined_at
       t.datetime :deleted_at