Class: Bag

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/inventory/bag.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Bag

Create the bag



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# File 'lib/inventory/bag.rb', line 7

def initialize
  @bag = Hash.new
end

Instance Method Details

#add(amount, item) ⇒ Object

> Insertions / Deletions



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# File 'lib/inventory/bag.rb', line 27

def add(amount, item)

  unless amount > 0
    raise Exceptions::NotEnoughError
    "Value must be greater than 0"
  end
  if Thing.exists?(:name => item)
   # find it in the database
   the_item = Thing.find_by(name: item)
   the_item.amount += amount
   the_item.save
  else
   @bag[item] = amount
   Thing.create(:name => item, :amount => amount)
  end
end

#add_all(other) ⇒ Object

> Should follow



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# File 'lib/inventory/bag.rb', line 45

def add_all(other)
  other.each do |item, amount|
    self.add(amount, item)
  end
end

#each(&block) ⇒ Object

> Iterating



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# File 'lib/inventory/bag.rb', line 75

def each(&block)
  @bag.each(&block)
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/inventory/bag.rb', line 22

def empty?
  @bag.size == 0
end

#has?(amount, item) ⇒ Boolean

> Booleans

Do we have the item?

Returns:

  • (Boolean) 


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# File 'lib/inventory/bag.rb', line 17

def has?(amount, item)
  Thing.exists?(:name => item) and Thing.find_by(name: item).amount >= amount
  #@bag.has_key?(item) and @bag[item] >= amount
end

#print ⇒ Object

> Formating

Let me know how many things are in my bag man.



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# File 'lib/inventory/bag.rb', line 81

def print
  buffer = []
  Thing.find_each do |a|
    if a.amount > 0
      buffer << "    #{a.name}: #{a.amount}"
    end
  end
  buffer
end

#remove(amount, item) ⇒ Object

Someone bought my things



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# File 'lib/inventory/bag.rb', line 52

def remove(amount, item)
  if !self.has?(amount, item) 
   puts "not enough"
  else
    # find it in the database
   the_item = Thing.find_by(name: item)
   the_item.amount -= amount
   the_item.save
  end
end

#remove_all(other) ⇒ Object 



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# File 'lib/inventory/bag.rb', line 63

def remove_all(other)
  if  @bag.empty?
    puts "empty bag"
    return
  else
    other.each do |item, amount|
      self.remove(amount, item)
    end
  end
end

#size ⇒ Object 



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# File 'lib/inventory/bag.rb', line 11

def size
  @bag.size
end