Class: MongoLiteDB

Inherits:
Object
  • Object
show all
Defined in:
lib/mongolitedb.rb

Instance Method Summary collapse

Constructor Details

#initialize(filename = "db.nsl") ⇒ MongoLiteDB

Returns a new instance of MongoLiteDB.



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# File 'lib/mongolitedb.rb', line 5

def initialize(filename="db.nsl")
  @filename = filename
  if not File.exists?(@filename)
    open(@filename, 'w'){|f| f.write(
      {
        "max_index" => 0,
        "objects" => []
      }.to_json
    )}
  end
end

Instance Method Details

#delete(query) ⇒ Object 



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# File 'lib/mongolitedb.rb', line 45

def delete(query)
  write_to_disk do |db|
    each_match(db, query) do |obj|
      db["objects"].delete(obj)
    end
  end
end

#find(query) ⇒ Object 



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# File 'lib/mongolitedb.rb', line 29

def find(query)
  entries = []
  load_from_disk do |db|
    each_match(db, query) do |obj|
      entries << obj
    end  
  end
  return entries
end

#insert(objects) ⇒ Object 



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# File 'lib/mongolitedb.rb', line 16

def insert(objects)
  if not objects.kind_of?(Array)
    objects  = [objects]
  end
  write_to_disk do |db|
    objects.each do |object|
      object_copy = object.clone
      object_copy["id"] = db["max_index"]
      db["max_index"] += 1
      db["objects"] << object_copy
    end
  end
end

#update(query, attr) ⇒ Object 



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# File 'lib/mongolitedb.rb', line 38

def update(query, attr)
  write_to_disk do |db|
    each_match(db, query) do |obj|
      obj.update(attr) 
    end 
  end     
end