couchrest_model/lib/couchrest/mixins/class_proxy.rb

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module CouchRest
module Mixins
module ClassProxy
def self.included(base)
base.extend(ClassMethods)
end
module ClassMethods
# Return a proxy object which represents a model class on a
# chosen database instance. This allows you to DRY operations
# where a database is chosen dynamically.
#
# ==== Example:
#
# db = CouchRest::Database.new(...)
# articles = Article.on(db)
#
# articles.all { ... }
# articles.by_title { ... }
#
# u = articles.get("someid")
#
# u = articles.new(:title => "I like plankton")
# u.save # saved on the correct database
def on(database)
Proxy.new(self, database)
end
end
class Proxy #:nodoc:
def initialize(klass, database)
@klass = klass
@database = database
end
# ExtendedDocument
def new(*args)
doc = @klass.new(*args)
doc.database = @database
doc
end
def method_missing(m, *args, &block)
if has_view?(m)
query = args.shift || {}
view(m, query, *args, &block)
else
super
end
end
# Mixins::DocumentQueries
def all(opts = {}, &block)
@klass.all({:database => @database}.merge(opts), &block)
end
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def count(opts = {}, &block)
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@klass.all({:database => @database, :raw => true, :limit => 0}.merge(opts), &block)['total_rows']
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end
def first(opts = {})
@klass.first({:database => @database}.merge(opts))
end
def get(id)
@klass.get(id, @database)
end
# Mixins::Views
def has_view?(view)
@klass.has_view?(view)
end
def view(name, query={}, &block)
@klass.view(name, {:database => @database}.merge(query), &block)
end
def all_design_doc_versions
@klass.all_design_doc_versions(@database)
end
def model_design_doc
@klass.model_design_doc(@database)
end
def cleanup_design_docs!
@klass.cleanup_design_docs!(@database)
end
# Mixins::DesignDoc
def design_doc
@klass.design_doc
end
def design_doc_fresh
@klass.design_doc_fresh
end
def refresh_design_doc
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@klass.refresh_design_doc_on(@database)
end
def save_design_doc
@klass.save_design_doc_on(@database)
end
end
end
end
end