From: "Sebastjan H." <lists@...>
Date: 2012-10-20T17:26:29+09:00
Subject: Re: database part of a desktop application

unknown wrote in post #1080513:
> Am 19.10.2012 23:16, schrieb Sebastjan H.:
>
>> File.open("all_cards.yml", "a+") {|f| YAML.dump(card, f)}
>>
>> This appends object after object. Here's the problem. How can I then
>> access and display certain or all cards after loading the file:
>>
>> card_file = YAML.load_file("all_cards.yml")
>>
>> I've tried putsing the card_file with different parameters but I always
>> get back the name of the first objec tin the storage.
>
> By appending, you end up with several YAML documents (or objects)
> in your file.
>
>
> You could iterate through them with:
>
> f = File.open('all_cards.yml')
> YAML.load_documents(f) do |card|
>    p card
> end
>
>
> Or you could read them all at once with:
>
> cards = nil
> File.open('all_cards.yml') do |f|
>    cards = YAML.load_stream(f)
> end
>
> p cards
>
>
>> And one last question, If I go with YAML and not YAML::Store can I
>> delete certain card from the storage?
>
> Read in all the cards and overwrite your YAML file, leaving out the
> card you want to delete.

Thank you. I think I'll also look into the YAML::Store a bit more. Where 
would I find a complete reference for it? Ruby-doc at 
http://www.ruby-doc.org/stdlib-1.9.3/libdoc/yaml/rdoc/YAML/Store.html 
only provides basic info.

Since the parent is PStore, may I just use that as a full reference?

I think the confusing part in all this is my perception of the storage 
files related to these functionalities and their manipulation (storing 
and loading of objects).

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