# server_block.rb

Path: | lib/sequel/extensions/server_block.rb
Last Update: | Sun May 19 07:59:58 +0000 2013

The server_block extension adds the Database#with_server method, which takes a shard argument and a block, and makes it so that access inside the block will use the specified shard by default.

First, you need to enable it on the database object:

      DB.extension :server_block

Then you can call with_server:

      DB.with_server(:shard1) do
        DB[:a].all # Uses shard1
        DB[:a].server(:shard2).all # Uses shard2
      end
      DB[:a].all # Uses default

You can even nest calls to with_server:

      DB.with_server(:shard1) do
        DB[:a].all # Uses shard1
        DB.with_server(:shard2) do
          DB[:a].all # Uses shard2
        end
        DB[:a].all # Uses shard1
      end
      DB[:a].all # Uses default

Note this this extension assumes the following shard names should use the server/shard passed to with_server: :default, nil, :read_only. All other shard names will cause the standard behavior to be used.

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