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comp.lang.ruby

YAML file problem

Feng Luhan

10/10/2007 4:47:00 PM

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
--
Posted via http://www.ruby-....
3 Answers

Rick DeNatale

10/10/2007 5:12:00 PM

0

On 10/10/07, Feng Luhan <jiorry@gmail.com> wrote:
> 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

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.denh...

Feng Luhan

10/10/2007 5:23:00 PM

0

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.
--
Posted via http://www.ruby-....

Joel VanderWerf

10/10/2007 7:49:00 PM

0

Feng Luhan wrote:
> 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

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' # http://redshift.sourceforg...

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


--
vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407