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on the road toward design docs

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This commit is contained in:
Chris Anderson 2008-11-08 16:28:58 -08:00
parent 04e818c154
commit 0769c2690f
10 changed files with 454 additions and 189 deletions
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1
lib/couchrest.rb
View file

@ -29,6 +29,7 @@ module CouchRest
autoload :Server, 'couchrest/core/server'
autoload :Database, 'couchrest/core/database'
autoload :Document, 'couchrest/core/document'
autoload :Design, 'couchrest/core/design'
autoload :View, 'couchrest/core/view'
autoload :Model, 'couchrest/core/model'
autoload :Pager, 'couchrest/helper/pager'

17
lib/couchrest/core/database.rb
View file

@ -70,7 +70,14 @@ module CouchRest
# GET a document from CouchDB, by id. Returns a Ruby Hash.
def get id
slug = CGI.escape(id)
CouchRest.get "#{@root}/#{slug}"
hash = CouchRest.get("#{@root}/#{slug}")
doc = if /^_design/ =~ hash["_id"]
Design.new(hash)
else
Document.new(hash)
end
doc.database = self
doc
end
# GET an attachment directly from CouchDB
@ -103,7 +110,7 @@ module CouchRest
if doc['_attachments']
doc['_attachments'] = encode_attachments(doc['_attachments'])
end
if doc['_id']
result = if doc['_id']
slug = CGI.escape(doc['_id'])
CouchRest.put "#{@root}/#{slug}", doc
else
@ -114,6 +121,12 @@ module CouchRest
CouchRest.post @root, doc
end
end
if result['ok']
doc['_id'] = result['id']
doc['_rev'] = result['rev']
doc.database = self if doc.respond_to?(:database=)
end
result
end
# POST an array of documents to CouchDB. If any of the documents are

98
lib/couchrest/core/design.rb Normal file
View file

@ -0,0 +1,98 @@
module CouchRest
class Design < Document
def view_by *keys
# @stale = true
opts = keys.pop if keys.last.is_a?(Hash)
opts ||= {}
self['views'] ||= {}
method_name = "by_#{keys.join('_and_')}"
if opts[:map]
view = {}
view['map'] = opts.delete(:map)
if opts[:reduce]
view['reduce'] = opts.delete(:reduce)
opts[:reduce] = false
end
self['views'][method_name] = view
else
doc_keys = keys.collect{|k|"doc['#{k}']"} # this is where :require => 'doc.x == true' would show up
key_emit = doc_keys.length == 1 ? "#{doc_keys.first}" : "[#{doc_keys.join(', ')}]"
guards = doc_keys
map_function = <<-JAVASCRIPT
function(doc) {
if (#{guards.join(' && ')}) {
emit(#{key_emit}, null);
}
}
JAVASCRIPT
self['views'][method_name] = {
'map' => map_function
}
method_name
end
end
# def method_missing m, *args
# if opts = has_view?(m)
# query = args.shift || {}
# view(m, opts.merge(query), *args)
# else
# super
# end
# end
# Dispatches to any named view.
def view name, query={}, &block
# if @stale
# self.save
# end
view_name = "#{slug}/#{name}"
fetch_view(view_name, query, &block)
end
def slug
id.sub('_design/','')
end
def slug= newslug
self['_id'] = "_design/#{newslug}"
end
def save
raise ArgumentError, "_design" unless slug && slug.length > 0
super
end
private
# returns stored defaults if the there is a view named this in the design doc
def has_view?(view)
view = view.to_s
self['views'][view] &&
(self['views'][view]["couchrest-defaults"]||{})
end
# def fetch_view_with_docs name, opts, raw=false, &block
# if raw
# fetch_view name, opts, &block
# else
# begin
# view = fetch_view name, opts.merge({:include_docs => true}), &block
# view['rows'].collect{|r|new(r['doc'])} if view['rows']
# rescue
# # fallback for old versions of couchdb that don't
# # have include_docs support
# view = fetch_view name, opts, &block
# view['rows'].collect{|r|new(database.get(r['id']))} if view['rows']
# end
# end
# end
def fetch_view view_name, opts, &block
database.view(view_name, opts, &block)
end
end
end

66
lib/couchrest/core/document.rb
View file

@ -15,11 +15,69 @@ module CouchRest
class Document < Response
end
class Design < Document
attr_accessor :database
# alias for self['_id']
def id
self['_id']
end
# alias for self['_rev']
def rev
self['_rev']
end
# returns true if the document has never been saved
def new_record?
!rev
end
# Saves the document to the db using create or update. Also runs the :save
# callbacks. Sets the <tt>_id</tt> and <tt>_rev</tt> fields based on
# CouchDB's response.
def save
raise ArgumentError, "doc.database required for saving" unless database
if new_record?
create
else
update
end
end
# Deletes the document from the database. Runs the :delete callbacks.
# Removes the <tt>_id</tt> and <tt>_rev</tt> fields, preparing the
# document to be saved to a new <tt>_id</tt>.
def destroy
result = database.delete self
if result['ok']
self['_rev'] = nil
self['_id'] = nil
end
result['ok']
end
protected
# Saves a document for the first time, after running the before(:create)
# callbacks, and applying the unique_id.
def create
set_unique_id if respond_to?(:set_unique_id) # hack
save_doc
end
# Saves the document and runs the :update callbacks.
def update
save_doc
end
private
def save_doc
result = database.save self
result['ok']
end
end
end

207
lib/couchrest/core/model.rb
View file

@ -87,7 +87,7 @@ module CouchRest
class_inheritable_accessor :casts
class_inheritable_accessor :default_obj
class_inheritable_accessor :class_database
class_inheritable_accessor :generated_design_doc
class_inheritable_accessor :design_doc
class_inheritable_accessor :design_doc_slug_cache
class_inheritable_accessor :design_doc_fresh
@ -111,15 +111,15 @@ module CouchRest
# Load all documents that have the "couchrest-type" field equal to the
# name of the current class. Take thes the standard set of
# CouchRest::Database#view options.
def all opts = {}
self.generated_design_doc ||= default_design_doc
unless design_doc_fresh
refresh_design_doc
end
view_name = "#{design_doc_slug}/all"
raw = opts.delete(:raw)
fetch_view_with_docs(view_name, opts, raw)
end
# def all opts = {}
# self.generated_design_doc ||= default_design_doc
# unless design_doc_fresh
# refresh_design_doc
# end
# view_name = "#{design_doc_slug}/all"
# raw = opts.delete(:raw)
# fetch_view_with_docs(view_name, opts, raw)
# end
# Cast a field as another class. The class must be happy to have the
# field's primitive type as the argument to it's constucture. Classes
@ -263,46 +263,54 @@ module CouchRest
# To understand the capabilities of this view system more compeletly,
# it is recommended that you read the RSpec file at
# <tt>spec/core/model_spec.rb</tt>.
def view_by *keys
opts = keys.pop if keys.last.is_a?(Hash)
opts ||= {}
type = self.to_s
method_name = "by_#{keys.join('_and_')}"
self.generated_design_doc ||= default_design_doc
ducktype = opts.delete(:ducktype)
if opts[:map]
view = {}
view['map'] = opts.delete(:map)
if opts[:reduce]
view['reduce'] = opts.delete(:reduce)
opts[:reduce] = false
end
generated_design_doc['views'][method_name] = view
else
doc_keys = keys.collect{|k|"doc['#{k}']"}
key_protection = doc_keys.join(' && ')
key_emit = doc_keys.length == 1 ? "#{doc_keys.first}" : "[#{doc_keys.join(', ')}]"
map_function = <<-JAVASCRIPT
function(doc) {
if (#{!ducktype ? "doc['couchrest-type'] == '#{type}' && " : ""}#{key_protection}) {
emit(#{key_emit}, null);
}
}
JAVASCRIPT
generated_design_doc['views'][method_name] = {
'map' => map_function
}
end
generated_design_doc['views'][method_name]['couchrest-defaults'] = opts
self.design_doc_fresh = false
method_name
def view_by *keys
self.design_doc ||= Design.new(default_design_doc)
self.design_doc.view_by(*keys)
end
# def view_by *keys
# opts = keys.pop if keys.last.is_a?(Hash)
# opts ||= {}
#
#
# type = self.to_s
#
# method_name = "by_#{keys.join('_and_')}"
# self.generated_design_doc ||= default_design_doc
# ducktype = opts.delete(:ducktype)
# if opts[:map]
# view = {}
# view['map'] = opts.delete(:map)
# if opts[:reduce]
# view['reduce'] = opts.delete(:reduce)
# opts[:reduce] = false
# end
# generated_design_doc['views'][method_name] = view
# else
# doc_keys = keys.collect{|k|"doc['#{k}']"}
# key_protection = doc_keys.join(' && ')
# key_emit = doc_keys.length == 1 ? "#{doc_keys.first}" : "[#{doc_keys.join(', ')}]"
# map_function = <<-JAVASCRIPT
# function(doc) {
# if (#{!ducktype ? "doc['couchrest-type'] == '#{type}' && " : ""}#{key_protection}) {
# emit(#{key_emit}, null);
# }
# }
# JAVASCRIPT
# generated_design_doc['views'][method_name] = {
# 'map' => map_function
# }
# end
# generated_design_doc['views'][method_name]['couchrest-defaults'] = opts
# self.design_doc_fresh = false
# method_name
# end
def method_missing m, *args
if opts = has_view?(m)
if has_view?(m)
query = args.shift || {}
view(m, opts.merge(query), *args)
view(m, query, *args)
else
super
end
@ -311,14 +319,14 @@ module CouchRest
# returns stored defaults if the there is a view named this in the design doc
def has_view?(view)
view = view.to_s
generated_design_doc['views'][view] &&
generated_design_doc['views'][view]["couchrest-defaults"]
design_doc['views'][view]
end
# Fetch the generated design doc. Could raise an error if the generated views have not been queried yet.
def design_doc
database.get("_design/#{design_doc_slug}")
end
# # Fetch the generated design doc. Could raise an error if the generated
# # views have not been queried yet.
# def design_doc
# database.get("_design/#{design_doc_slug}")
# end
# Dispatches to any named view.
def view name, query={}, &block
@ -327,8 +335,7 @@ module CouchRest
end
query[:raw] = true if query[:reduce]
raw = query.delete(:raw)
view_name = "#{design_doc_slug}/#{name}"
fetch_view_with_docs(view_name, query, raw, &block)
fetch_view_with_docs(name, query, raw, &block)
end
private
@ -352,7 +359,7 @@ module CouchRest
def fetch_view view_name, opts, &block
retryable = true
begin
database.view(view_name, opts, &block)
design_doc.view(view_name, opts, &block)
# the design doc could have been deleted by a rouge process
rescue RestClient::ResourceNotFound => e
if retryable
@ -368,7 +375,7 @@ module CouchRest
def design_doc_slug
return design_doc_slug_cache if design_doc_slug_cache && design_doc_fresh
funcs = []
generated_design_doc['views'].each do |name, view|
design_doc['views'].each do |name, view|
funcs << "#{name}/#{view['map']}#{view['reduce']}"
end
md5 = Digest::MD5.hexdigest(funcs.sort.join(''))
@ -390,20 +397,21 @@ module CouchRest
}
end
def refresh_design_doc
did = "_design/#{design_doc_slug}"
saved = database.get(did) rescue nil
if saved
generated_design_doc['views'].each do |name, view|
saved['views'][name] = view
end
database.save(saved)
else
generated_design_doc['_id'] = did
database.save(generated_design_doc)
end
self.design_doc_fresh = true
end
# def refresh_design_doc
# did = "_design/#{design_doc_slug}"
# saved = database.get(did) rescue nil
# if saved
# design_doc['views'].each do |name, view|
# saved['views'][name] = view
# end
# database.save(saved)
# else
# design_doc['_id'] = did
# design_doc.database = database
# design_doc.save
# end
# self.design_doc_fresh = true
# end
end # class << self
@ -412,16 +420,6 @@ module CouchRest
self.class.database
end
# alias for self['_id']
def id
self['_id']
end
# alias for self['_rev']
def rev
self['_rev']
end
# Takes a hash as argument, and applies the values by using writer methods
# for each key. Raises a NoMethodError if the corresponding methods are
# missing. In case of error, no attributes are changed.
@ -435,59 +433,8 @@ module CouchRest
save
end
# returns true if the document has never been saved
def new_record?
!rev
end
# Saves the document to the db using create or update. Also runs the :save
# callbacks. Sets the <tt>_id</tt> and <tt>_rev</tt> fields based on
# CouchDB's response.
def save
if new_record?
create
else
update
end
end
# Deletes the document from the database. Runs the :delete callbacks.
# Removes the <tt>_id</tt> and <tt>_rev</tt> fields, preparing the
# document to be saved to a new <tt>_id</tt>.
def destroy
result = database.delete self
if result['ok']
self['_rev'] = nil
self['_id'] = nil
end
result['ok']
end
protected
# Saves a document for the first time, after running the before(:create)
# callbacks, and applying the unique_id.
def create
set_unique_id if respond_to?(:set_unique_id) # hack
save_doc
end
# Saves the document and runs the :update callbacks.
def update
save_doc
end
private
def save_doc
result = database.save self
if result['ok']
self['_id'] = result['id']
self['_rev'] = result['rev']
end
result['ok']
end
def apply_defaults
if self.class.default
self.class.default.each do |k,v|

2
spec/couchrest/core/database_spec.rb
View file

@ -215,7 +215,7 @@ describe CouchRest::Database do
r2["lemons"].should == "from texas"
end
it "should use PUT with UUIDs" do
CouchRest.should_receive(:put)
CouchRest.should_receive(:put).and_return({"ok" => true, "id" => "100", "rev" => "55"})
r = @db.save({'just' => ['another document']})
end

86
spec/couchrest/core/design_spec.rb Normal file
View file

@ -0,0 +1,86 @@
require File.dirname(__FILE__) + '/../../spec_helper'
describe CouchRest::Design do
# before(:each) do
# @db = reset_test_db!
# end
describe "defining a view" do
# before(:each) do
# @design_docs = @db.documents :startkey => "_design/",
# :endkey => "_design/\u9999"
# end
it "should add a view to the design doc" do
@des = CouchRest::Design.new
method = @des.view_by :name
method.should == "by_name"
@des["views"]["by_name"].should_not be_nil
end
end
describe "with an unsaved view" do
before(:each) do
@des = CouchRest::Design.new
method = @des.view_by :name
end
it "should accept a slug" do
@des.slug = "mytest"
@des.slug.should == "mytest"
end
it "should not save on view definition" do
@des.rev.should be_nil
end
it "should freak out on view access" do
lambda{@des.view :by_name}.should raise_error
end
end
describe "when it's saved" do
before(:each) do
@db = reset_test_db!
@db.bulk_save([{"name" => "x"},{"name" => "y"}])
@des = CouchRest::Design.new
@des.database = @db
method = @des.view_by :name
end
it "should become angry when saved without a slug" do
lambda{@des.save}.should raise_error
end
it "should by queryable when it's saved" do
@des.slug = "mydesign"
@des.save
res = @des.view :by_name
res["rows"][0]["key"].should == "x"
end
end
describe "from a saved document" do
before(:all) do
@db = reset_test_db!
@db.save({
"_id" => "_design/test",
"views" => {
"by_name" => {
"map" => "function(doc){if (doc.name) emit(doc.name, null)}"
}
}
})
@db.bulk_save([{"name" => "a"},{"name" => "b"}])
@des = @db.get "_design/test"
end
it "should be a Design" do
@des.should be_an_instance_of CouchRest::Design
end
it "should have a slug" do
@des.slug.should == "test"
@des.slug = "supertest"
@des.id.should == "_design/supertest"
end
it "should by queryable" do
res = @des.view :by_name
res["rows"][0]["key"].should == "a"
end
end
end

48
spec/couchrest/core/document_spec.rb
View file

@ -21,9 +21,55 @@ describe CouchRest::Document, "[]=" do
end
describe CouchRest::Document, "new" do
before(:each) do
@doc = CouchRest::Document.new("key" => [1,2,3], :more => "values")
end
it "should create itself from a Hash" do
@doc = CouchRest::Document.new("key" => [1,2,3], :more => "values")
@doc["key"].should == [1,2,3]
@doc["more"].should == "values"
end
it "should not have rev and id" do
@doc.rev.should be_nil
@doc.id.should be_nil
end
it "should freak out when saving without a database" do
lambda{@doc.save}.should raise_error(ArgumentError)
end
end
# move to database spec
describe CouchRest::Document, "saving using a database" do
before(:all) do
@doc = CouchRest::Document.new("key" => [1,2,3], :more => "values")
@db = reset_test_db!
@resp = @db.save(@doc)
end
it "should get the database" do
@doc.database.should == @db
end
it "should get id and rev" do
@doc.id.should == @resp["id"]
@doc.rev.should == @resp["rev"]
end
end
describe "getting from a database" do
before(:all) do
@db = reset_test_db!
@resp = @db.save({
"key" => "value"
})
@doc = @db.get @resp['id']
end
it "should return a document" do
@doc.should be_an_instance_of(CouchRest::Document)
end
it "should have a database" do
@doc.database.should == @db
end
it "should be saveable" do
@doc["more"] = "keys"
@doc.save
@db.get(@resp['id'])["more"].should == "keys"
end
end

108
spec/couchrest/core/model_spec.rb
View file

@ -33,6 +33,8 @@ class Course < CouchRest::Model
view_by :dept, :ducktype => true
end
class Article < CouchRest::Model
use_database CouchRest.database!('http://localhost:5984/couchrest-model-test')
unique_id :slug
@ -213,24 +215,24 @@ describe CouchRest::Model do
@course["questions"][0].a[0].should == "beast"
end
end
describe "finding all instances of a model" do
before(:all) do
WithTemplate.new('important-field' => '1').save
WithTemplate.new('important-field' => '2').save
WithTemplate.new('important-field' => '3').save
WithTemplate.new('important-field' => '4').save
end
it "should make the design doc" do
WithTemplate.all
d = WithTemplate.design_doc
d['views']['all']['map'].should include('WithTemplate')
end
it "should find all" do
rs = WithTemplate.all
rs.length.should == 4
end
end
#
# describe "finding all instances of a model" do
# before(:all) do
# WithTemplate.new('important-field' => '1').save
# WithTemplate.new('important-field' => '2').save
# WithTemplate.new('important-field' => '3').save
# WithTemplate.new('important-field' => '4').save
# end
# it "should make the design doc" do
# WithTemplate.all
# d = WithTemplate.design_doc
# d['views']['all']['map'].should include('WithTemplate')
# end
# it "should find all" do
# rs = WithTemplate.all
# rs.length.should == 4
# end
# end
describe "getting a model with a subobject field" do
before(:all) do
@ -390,10 +392,14 @@ describe CouchRest::Model do
written_at += 24 * 3600
end
end
it "should have a design doc" do
Article.design_doc["views"]["by_date"].should_not be_nil
end
it "should create the design doc" do
Article.by_date rescue nil
doc = Article.design_doc
it "should save the design doc" do
Article.by_date #rescue nil
doc = Article.database.get Article.design_doc.id
doc['views']['by_date'].should_not be_nil
end
@ -402,10 +408,10 @@ describe CouchRest::Model do
view['rows'].length.should == 4
end
it "should return the matching objects (with descending)" do
articles = Article.by_date
articles.collect{|a|a.title}.should == @titles.reverse
end
# it "should return the matching objects (with default argument :descending => true)" do
# articles = Article.by_date
# articles.collect{|a|a.title}.should == @titles.reverse
# end
it "should allow you to override default args" do
articles = Article.by_date :descending => false
@ -417,38 +423,36 @@ describe CouchRest::Model do
before(:all) do
Course.database.delete! rescue nil
@db = @cr.create_db(TESTDB) rescue nil
Course.new(:title => 'aaa').save
Course.new(:title => 'bbb').save
Course.new(:title => 'ddd').save
Course.new(:title => 'eee').save
%w{aaa bbb ddd eee}.each do |title|
Course.new(:title => title).save
end
end
it "should make the design doc upon first query" do
Course.by_title
doc = Course.design_doc
doc['views']['all']['map'].should include('Course')
end
it "should can query via view" do
# register methods with method-missing, for local dispatch. method
# missing lookup table, no heuristics.
view = Course.view :by_title
designed = Course.by_title
view.should == designed
end
it "should get them" do
rs = Course.by_title
rs.length.should == 4
end
it "should yield" do
courses = []
rs = Course.by_title # remove me
Course.view(:by_title) do |course|
# puts "course"
courses << course
end
# courses.should == 'x'
courses[0]["doc"]["title"].should =='aaa'
end
# it "should can query via view" do
# # register methods with method-missing, for local dispatch. method
# # missing lookup table, no heuristics.
# view = Course.view :by_title
# designed = Course.by_title
# view.should == designed
# end
# it "should get them" do
# rs = Course.by_title
# rs.length.should == 4
# end
# it "should yield" do
# courses = []
# rs = Course.by_title # remove me
# Course.view(:by_title) do |course|
# courses << course
# end
# courses[0]["doc"]["title"].should =='aaa'
# end
end
describe "a ducktype view" do
before(:all) do
@ -468,6 +472,9 @@ describe CouchRest::Model do
@as[0]['_id'].should == @id
end
end
end
__END__
describe "a model with a compound key view" do
before(:all) do
@ -527,6 +534,7 @@ describe CouchRest::Model do
end
end
# TODO: moved to Design, delete
describe "adding a view" do
before(:each) do
Article.by_date

10
spec/spec_helper.rb
View file

@ -3,4 +3,12 @@ require File.dirname(__FILE__) + '/../lib/couchrest'
FIXTURE_PATH = File.dirname(__FILE__) + '/fixtures'
COUCHHOST = "http://localhost:5984"
TESTDB = 'couchrest-test'
TESTDB = 'couchrest-test'
def reset_test_db!
cr = CouchRest.new(COUCHHOST)
db = cr.database(TESTDB)
db.delete! rescue nil
db = cr.create_db(TESTDB) rescue nin
db
end