Added CSV format for fixtures #272 [what-a-day]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@55 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
This commit is contained in:
David Heinemeier Hansson 2004-12-07 10:24:13 +00:00
parent 165097ede5
commit 5e3eaff5bb
2 changed files with 145 additions and 36 deletions

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@ -1,5 +1,7 @@
*CVS*
* Added CSV format for fixtures #272 [what-a-day]. (See the new and expanded documentation on fixtures for more information)
* Fixed fixtures using primary key fields called something else than "id" [dave]
* Added proper handling of time fields that are turned into Time objects with the dummy date of 2000/1/1 [HariSeldon]

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@ -1,54 +1,145 @@
require 'erb'
require 'yaml'
require 'csv'
require 'active_record/support/class_inheritable_attributes'
require 'active_record/support/inflector'
# Fixtures are a way of organizing data that you want to test against. You normally have one YAML file with fixture
# definitions per model. They're just hashes of hashes with the first-level key being the name of fixture (try to keep
# that name unique across all fixtures in the system for reasons that will follow). The value to that key is a hash
# where the keys are column names and the values the fixture data you want to insert into it. Example for developers.yml:
# Fixtures are a way of organizing data that you want to test against; in short, sample data. They come in 3 flavours:
#
# david:
# id: 1
# name: David Heinemeier Hansson
# birthday: 1979-10-15
# profession: Systems development
# 1. YAML fixtures
# 2. CSV fixtures
# 3. Single-file fixtures
#
# steve:
# id: 2
# name: Steve Ross Kellock
# birthday: 1974-09-27
# profession: guy with keyboard
# = YAML fixtures
#
# So this YAML file includes two fixtures. T
# This type of fixture is in YAML format and the preferred default. YAML is a file format which describes data structures
# in a non-verbose, humanly-readable format. It ships with Ruby 1.8.1+.
#
# Now when we call <tt>@developers = Fixtures.create_fixtures(".", "developers")</tt> both developers will get inserted into
# the "developers" table through the active Active Record connection (that must be setup before-hand). And we can now query
# the fixture data through the <tt>@developers</tt> hash, so <tt>@developers["david"]["name"]</tt> will return
# <tt>"David Heinemeier Hansson"</tt> and <tt>@developers["david"]["birthday"]</tt> will return <tt>Date.new(1979, 10, 15)</tt>.
# Unlike single-file fixtures, YAML fixtures are stored in a single file per model, which is place in the directory appointed
# by <tt>Test::Unit::TestCase.fixture_path=(path)</tt> (this is automatically configured for Rails, so you can just
# put your files in <your-rails-app>/test/fixtures/). The fixture file ends with the .yml file extension (Rails example:
# "<your-rails-app>/test/fixtures/web_sites.yml"). The format of a YAML fixture file looks like this:
#
# In addition to getting the raw data, we can also get the Developer object by doing @developers["david"].find. This can then
# be used for comparison in a unit test. Something like:
# rubyonrails:
# id: 1
# name: Ruby on Rails
# url: http://www.rubyonrails.org
#
# google:
# id: 2
# name: Google
# url: http://www.google.com
#
# This YAML fixture file includes two fixtures. Each YAML fixture (ie. record) is given a name and is followed by an
# indented list of key/value pairs in the "key: value" format. Records are separated by a blank line for your viewing
# pleasure.
#
# = CSV fixtures
#
# Fixtures can also be kept in the in the Comma Separated Value format. Akin to YAML fixtures, CSV fixtures are stored
# in a single file, but, instead end with the .csv file extension (Rails example: "<your-rails-app>/test/fixtures/web_sites.csv")
#
# The format of this tye of fixture file is much more compact than the others, but also a little harder to read by us
# humans. The first line of the CSV file is a comma-separated list of field names. The rest of the file is then comprised
# of the actual data (1 per line). Here's an example:
#
# id, name, url
# 1, Ruby On Rails, http://www.rubyonrails.org
# 2, Google, http://www.google.com
#
# Should you have a piece of data with a comma character in it, you can place double quotes around that value. If you
# need to use a double quote character, you must escape it with another double quote.
#
# Another unique attribute of the CSV fixture is that it has *no* fixture name like the other two formats. Instead, the
# fixture names are automatically generated by deriving the class name of the fixture file and adding an incrementing
# number to the end. In our example, the 1st fixture would be called "web_site_1" and the 2nd one would be called
# "web_site_2".
#
# Most databases and spreadsheets support exporting to CSV format, so this is a great format for you to choose if you
# have existing data somewhere already.
#
# = Single-file fixtures
#
# This type of fixtures was the original format for Active Record that has since been deprecated in favor of the YAML and CSV formats.
# Fixtures for this format are created by placing text files in a sub-directory (with the name of the model) to the directory
# appointed by <tt>Test::Unit::TestCase.fixture_path=(path)</tt> (this is automatically configured for Rails, so you can just
# put your files in <your-rails-app>/test/fixtures/<your-model-name>/ -- like <your-rails-app>/test/fixtures/web_sites/ for the WebSite
# model).
#
# Each text file placed in this directory represents a "record". Usually these types of fixtures are named without
# extensions, but if you are on a Windows machine, you might consider adding .txt as the extension. Here's what the
# above example might look like:
#
# web_sites/google
# web_sites/yahoo.txt
# web_sites/ruby-on-rails
#
# The file format of a standard fixture is simple. Each line is a property (or column in db speak) and has the syntax
# of "name => value". Here's an example of the ruby-on-rails fixture above:
#
# id => 1
# name => Ruby on Rails
# url => http://www.rubyonrails.org
#
# = Using Fixtures
#
# Since fixtures are a testing construct, we use them in our unit and functional tests. There are two ways to use the
# fixtures, but first lets take a look at a sample unit test found:
#
# require 'web_site'
#
# class WebSiteTest < Test::Unit::TestCase
# def test_web_site_count
# assert_equal 2, WebSite.count
# end
# end
#
# As it stands, unless we pre-load the web_site table in our database with two records, this test will fail. Here's the
# easiest way to add fixtures to the database:
#
# ...
# class WebSiteTest < Test::Unit::TestCase
# fixtures :web_sites # add more by separating the symbols with commas
# ...
#
# By adding a "fixtures" method to the test case and passing it a list of symbols (only one is shown here tho), we trigger
# the testing environment to automatically load the appropriate fixtures into the database before each test, and
# automatically delete them after each test.
#
# In addition to being available in the database, the fixtures are also loaded into a hash stored in an instance variable
# of the test case. It is named after the symbol... so, in our example, there would be a hash available called
# @web_sites. This is where the "fixture name" comes into play.
#
# On top of that, each record is automatically "found" (using Model.find(id)) and placed in the instance variable of its name.
# So for the YAML fixtures, we'd get @rubyonrails and @google, which could be interrogated using regular Active Record semantics:
#
# # test if the object created from the fixture data has the same attributes as the data itself
# def test_find
# assert_equal @developers["david"]["name"], @developers["david"].find.name
# assert_equal @web_sites["rubyonrails"]["name"], @rubyonrails.name
# end
#
# Comparing that the data we have on the name is also what the object returns when we ask for it.
# As seen above, the data hash created from the YAML fixtures would have @web_sites["rubyonrails"]["url"] return
# "http://www.rubyonrails.org" and @web_sites["google"]["name"] would return "Google". The same fixtures, but loaded
# from a CSV fixture file would be accessible via @web_sites["web_site_1"]["name"] == "Ruby on Rails" and have the individual
# fixtures available as instance variables @web_site_1 and @web_site_2.
#
# == Automatic fixture setup and instance variable availability
# = Dynamic fixtures with ERb
#
# Fixtures can also be automatically instantiated in instance variables relating to their names using the following style:
# Some times you don't care about the content of the fixtures as much as you care about the volume. In these cases, you can
# mix ERb in with your YAML or CSV fixtures to create a bunch of fixtures for load testing, like:
#
# class FixturesTest < Test::Unit::TestCase
# fixtures :developers # you can add more with comma separation
# <% for i in 1..1000 %>
# fix_<%= i %>:
# id: <%= i %>
# name: guy_<%= 1 %>
# <% end %>
#
# def test_developers
# assert_equal 3, @developers.size # the container for all the fixtures is automatically set
# assert_kind_of Developer, @david # works like @developers["david"].find
# assert_equal "David Heinemeier Hansson", @david.name
# end
# end
# This will create 1000 YAML very simple fixtures.
#
# Using ERb, you can also inject dynamic values into your fixtures with inserts like <%= Date.today.strftime("%Y-%m-%d") %>.
# This is however a feature to be used with some caution. The point of fixtures are that they're stable units of predictable
# sample data. If you feel that you need to inject dynamic values, then perhaps you should reexamine whether your application
# is properly testable. Hence, dynamic values in fixtures are to be considered a code smell.
class Fixtures < Hash
def self.instantiate_fixtures(object, fixtures_directory, *table_names)
[ create_fixtures(fixtures_directory, *table_names) ].flatten.each_with_index do |fixtures, idx|
@ -68,8 +159,8 @@ class Fixtures < Hash
fixtures = table_names.flatten.map do |table_name|
Fixtures.new(connection, table_name.to_s, File.join(fixtures_directory, table_name.to_s))
end
fixtures.reverse.each{ |fixture| fixture.delete_existing_fixtures }
fixtures.each{ |fixture| fixture.insert_fixtures }
fixtures.reverse.each { |fixture| fixture.delete_existing_fixtures }
fixtures.each { |fixture| fixture.insert_fixtures }
end
return fixtures.size > 1 ? fixtures : fixtures.first
ensure
@ -77,7 +168,7 @@ class Fixtures < Hash
end
end
def initialize(connection, table_name, fixture_path, file_filter = /^\.|CVS|\.yml/)
def initialize(connection, table_name, fixture_path, file_filter = /^\.|CVS|\.yml|\.csv/)
@connection, @table_name, @fixture_path, @file_filter = connection, table_name, fixture_path, file_filter
@class_name = Inflector.classify(@table_name)
@ -97,10 +188,22 @@ class Fixtures < Hash
private
def read_fixture_files
if File.exists?(yaml_file_path)
# YAML fixtures
YAML::load(erb_render(IO.read(yaml_file_path))).each do |name, data|
self[name] = Fixture.new(data, @class_name)
end
elsif File.exists?(csv_file_path)
# CSV fixtures
reader = CSV::Reader.create(erb_render(IO.read(csv_file_path)))
header = reader.shift
i = 0
reader.each do |row|
data = {}
row.each_with_index { |cell, j| data[header[j].to_s.strip] = cell.to_s.strip }
self["#{Inflector::underscore(@class_name)}_#{i+=1}"]= Fixture.new(data, @class_name)
end
else
# Standard fixtures
Dir.entries(@fixture_path).each do |file|
self[file] = Fixture.new(File.join(@fixture_path, file), @class_name) unless file =~ @file_filter
end
@ -110,6 +213,10 @@ class Fixtures < Hash
def yaml_file_path
@fixture_path + ".yml"
end
def csv_file_path
@fixture_path + ".csv"
end
def yaml_fixtures_key(path)
File.basename(@fixture_path).split(".").first