couchrest_model/lib/couchrest/mixins/design_doc.rb

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require 'digest/md5'
module CouchRest
module Mixins
module DesignDoc
def self.included(base)
base.extend(ClassMethods)
end
module ClassMethods
attr_accessor :design_doc, :design_doc_slug_cache, :design_doc_fresh
def design_doc
@design_doc ||= Design.new(default_design_doc)
end
def design_doc_id
"_design/#{design_doc_slug}"
end
def design_doc_slug
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return design_doc_slug_cache if (design_doc_slug_cache && design_doc_fresh)
funcs = []
design_doc['views'].each do |name, view|
funcs << "#{name}/#{view['map']}#{view['reduce']}"
end
self.design_doc_slug_cache = self.to_s
end
def default_design_doc
{
"language" => "javascript",
"views" => {
'all' => {
'map' => "function(doc) {
if (doc['couchrest-type'] == '#{self.to_s}') {
emit(null,1);
}
}"
}
}
}
end
def refresh_design_doc
reset_design_doc
save_design_doc
end
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def refresh_design_doc_on(db)
reset_design_doc
save_design_doc_on(db)
end
# Save the design doc onto the default database, and update the
# design_doc attribute
def save_design_doc
reset_design_doc unless design_doc_fresh
self.design_doc = update_design_doc(design_doc)
end
# Save the design doc onto a target database in a thread-safe way,
# not modifying the model's design_doc
def save_design_doc_on(db)
update_design_doc(Design.new(design_doc), db)
end
private
def reset_design_doc
current = self.database.get(design_doc_id) rescue nil
design_doc['_id'] = design_doc_id
if current.nil?
design_doc.delete('_rev')
else
design_doc['_rev'] = current['_rev']
end
self.design_doc_fresh = true
end
# Writes out a design_doc to a given database, returning the
# updated design doc
def update_design_doc(design_doc, db = database)
saved = db.get(design_doc['_id']) rescue nil
if saved
design_doc['views'].each do |name, view|
saved['views'][name] = view
end
db.save_doc(saved)
saved
else
design_doc.database = db
design_doc.save
design_doc
end
end
end # module ClassMethods
end
end
end