Better support for Batch Operations

[adelevie]

Better support for Batch Operations

[ericcj]

a simple API would be to expose save_request and parse_delete_request methods on Parse::Object that return the [uri, method, body] to be passed to Parse::Client.request by the actual save and parse_delete operations. that way you could batch.add(some_object.save_request); batch.add(another_obj.parse_delete_request)

[adelevie]

So this is what I've settled on for now:

# instantiate the batch
batch = Parse::Batch.new

# create
batch.create_object(Parse::Object.new("Foo"))

# update
foo = Parse::Query.new("Foo").get.first
foo["bar"] = "updated"
batch.update_object(foo)

# delete
Parse::Query.new("Foo").eg("old", true).each do |foo|
  batch.delete_object(foo)
end

# run the batch
batch.run!

I refactored Parse::Object#safe_json into Parse::Object#safe_hash. Now #safe_json just returns #safe_hash.to_json. With #safe_hash, I can construct a hash suitable for the body parameter of the batch request.

Here's the source behind Parse::Batch:

module Parse
  class Batch
    attr_reader :requests

    def initialize
      @requests ||= []
    end

    def add_request(request)
      @requests << request
    end

    def create_object(object)
      method = "POST"
      path = Parse::Protocol.class_uri(object.class_name)
      body = object.safe_hash
      add_request({
        "method" => method,
        "path" => path,
        "body" => body
      })
    end

    def update_object(object)
      method = "PUT"
      path = Parse::Protocol.class_uri(object.class_name, object.id)
      body = object.safe_hash
      add_request({
        "method" => method,
        "path" => path,
        "body" => body
      })
    end

    def delete_object(object)
      add_request({
        "method" => "DELETE",
        "path" => Parse::Protocol.class_uri(object.class_name, object.id)
      })
    end

    def run!
      uri = Parse::Protocol.batch_request_uri
      body = {:requests => @requests}.to_json
      Parse.client.request(uri, :post, body)
    end


  end

end