YAML file problem

Ruby
1

I hava a yaml file as application config file. I use YAML::Store to
reset yaml key value, but it is not work. please help me!

y = YAML::Store.new( “#{RAILS_ROOT}/config_app/config.yml”, :Indent => 2
)
y.transaction do
y[‘value’].key1 = ‘aaa’ # undefined method `[]’ for
#YAML::DomainType
y[‘value’].key2 = ‘bbb’
end

File.open(‘config.yml’,‘a+’) do |file|
yy = YAML::load(file)
puts yy.value[‘key1’] # key1 = 111
yy.value[‘key1’] = ‘aaa’ # config.yml have not changed.
end

2

On 10/10/07, Feng L. [email protected] wrote:

File.open(‘config.yml’,‘a+’) do |file|
yy = YAML::load(file)
puts yy.value[‘key1’] # key1 = 111
yy.value[‘key1’] = ‘aaa’ # config.yml have not changed.
end

Why should config.yml change? yy is just whatever object which got
marshalled in when you read the file. Try:

y = YAML::Store.new( “#{RAILS_ROOT}/config_app/config.yml”, :Indent =>
2)
y.transaction do
y[‘value’].key1 = ‘aaa’
y[‘value’].key2 = ‘bbb’
end

y.transaction do
puts y.value[‘key1’] # key1 = 111
y.value[‘key1’] = ‘aaa’
end

–
Rick DeNatale

My blog on Ruby
http://talklikeaduck.denhaven2.com/

3

We already have a config.yal
key1: 111
key2: 222

Now, user want to change key1 to ‘aaa’. We must update the config file.
originally it is store in the Database, but I think storing in the yaml
file is better.

4

Feng L. wrote:

File.open(‘config.yml’,‘a+’) do |file|
yy = YAML::load(file)
puts yy.value[‘key1’] # key1 = 111
yy.value[‘key1’] = ‘aaa’ # config.yml have not changed.
end

I don’t know much about YAML::Store, but if it is a YAML version of
PStore, then I recommend using my FSDB library instead.

Here’s an example:

require ‘fsdb’ # FSDB

db = FSDB::Database.new(“~/tmp”)

Tell FSDB to use YAML format when it sees “.yml” and “.yaml” suffixes.

It is easy to extend the recognition rules to handle other formats.

db.formats = [FSDB::YAML_FORMAT] + db.formats

Write (atomically) the initial data to the file.

db[“config.yml”] = { “key1” => 111, “key2” => 222 }

Enter a thread-safe and process-safe transaction to

change the state of the file.

db.edit(“config.yml”) do |cfg|
cfg[‘key1’] = ‘aaa’
cfg[‘key2’] = ‘bbb’
end

Check that it works.

puts File.read(File.expand_path(“~/tmp/config.yml”))

END

Output:

key1: aaa
key2: bbb