YAML file problem

[Feng Luhan]

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:omainType>
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

 

[Rick DeNatale]

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:omainType>
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

 

[Feng Luhan]

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.

 

[Joel VanderWerf]

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:omainType>
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.sourceforge.net/fsdb

db = FSDB:atabase.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: