couchrest_model/lib/couchrest/model/design_doc.rb

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# encoding: utf-8
module CouchRest
module Model
module DesignDoc
def self.included(base)
base.extend(ClassMethods)
end
module ClassMethods
def design_doc
@design_doc ||= Design.new(default_design_doc)
end
# Use when something has been changed, like a view, so that on the next request
# the design docs will be updated (if changed!)
def req_design_doc_refresh
@design_doc_fresh = { }
end
def design_doc_id
"_design/#{design_doc_slug}"
end
def design_doc_slug
self.to_s
end
def default_design_doc
{
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"_id" => design_doc_id,
"language" => "javascript",
"views" => {
'all' => {
'map' => "function(doc) {
if (doc['couchrest-type'] == '#{self.to_s}') {
emit(doc['_id'],1);
}
}"
}
}
}
end
# DEPRECATED
# use stored_design_doc to retrieve the current design doc
def all_design_doc_versions(db = database)
db.documents :startkey => "_design/#{self.to_s}",
:endkey => "_design/#{self.to_s}-\u9999"
end
# Retreive the latest version of the design document directly
# from the database.
def stored_design_doc(db = database)
db.get(design_doc_id) rescue nil
end
alias :model_design_doc :stored_design_doc
def refresh_design_doc(db = database)
raise "Database missing for design document refresh" if db.nil?
unless design_doc_fresh(db)
save_design_doc(db)
design_doc_fresh(db, true)
end
end
# Save the design doc onto a target database in a thread-safe way,
# not modifying the model's design_doc
#
# See also save_design_doc! to always save the design doc even if there
# are no changes.
def save_design_doc(db = database, force = false)
update_design_doc(Design.new(design_doc), db, force)
end
# Force the update of the model's design_doc even if it hasn't changed.
def save_design_doc!(db = database)
save_design_doc(db, true)
end
protected
def design_doc_fresh(db, fresh = nil)
@design_doc_fresh ||= {}
if fresh.nil?
@design_doc_fresh[db.uri] || false
else
@design_doc_fresh[db.uri] = fresh
end
end
# Writes out a design_doc to a given database, returning the
# updated design doc
def update_design_doc(design_doc, db, force = false)
saved = stored_design_doc(db)
if saved
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changes = force
design_doc['views'].each do |name, view|
if !compare_views(saved['views'][name], view)
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changes = true
saved['views'][name] = view
end
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end
if changes
db.save_doc(saved)
end
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design_doc
else
design_doc.database = db
design_doc.save
design_doc
end
end
# Return true if the two views match
def compare_views(orig, repl)
return false if orig.nil? or repl.nil?
(orig['map'].to_s.strip == repl['map'].to_s.strip) && (orig['reduce'].to_s.strip == repl['reduce'].to_s.strip)
end
end # module ClassMethods
end
end
end