91 lines
2.3 KiB
Ruby
91 lines
2.3 KiB
Ruby
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#### NOTE Work in progress! Not yet used!
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module CouchRest
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module Model
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# A design block in CouchRest Model groups together the functionality of CouchDB's
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# design documents in a simple block definition.
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#
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# class Person < CouchRest::Model::Base
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# property :name
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# timestamps!
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#
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# design do
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# view :by_name
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# end
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# end
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#
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module Designs
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extend ActiveSupport::Concern
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module ClassMethods
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# Add views and other design document features
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# to the current model.
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def design(*args, &block)
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mapper = DesignMapper.new(self)
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mapper.create_view_method(:all)
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mapper.instance_eval(&block) if block_given?
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end
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# Override the default page pagination value:
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#
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# class Person < CouchRest::Model::Base
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# paginates_per 10
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# end
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#
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def paginates_per(val)
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@_default_per_page = val
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end
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# The models number of documents to return
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# by default when performing pagination.
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# Returns 25 unless explicitly overridden via <tt>paginates_per</tt>
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def default_per_page
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@_default_per_page || 25
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end
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end
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#
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class DesignMapper
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attr_accessor :model
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def initialize(model)
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self.model = model
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end
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# Define a view and generate a method that will provide a new
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# View instance when requested.
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def view(name, opts = {})
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View.create(model, name, opts)
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create_view_method(name)
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end
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# Really simple design function that allows a filter
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# to be added. Filters are simple functions used when listening
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# to the _changes feed.
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#
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# No methods are created here, the design is simply updated.
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# See the CouchDB API for more information on how to use this.
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def filter(name, function)
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filters = (self.model.design_doc['filters'] ||= {})
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filters[name.to_s] = function
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end
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def create_view_method(name)
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model.class_eval <<-EOS, __FILE__, __LINE__ + 1
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def self.#{name}(opts = {})
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CouchRest::Model::Designs::View.new(self, opts, '#{name}')
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end
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EOS
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end
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end
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end
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end
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end
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