Class: DataMapper::Session

Inherits:
Object show all
Defined in:
lib/data_mapper/session.rb

Defined Under Namespace

Classes: MaterializationError

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(adapter) ⇒ Session

Returns a new instance of Session.



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# File 'lib/data_mapper/session.rb', line 12

def initialize(adapter)
  @adapter = adapter
end

Instance Attribute Details

#adapter ⇒ Object (readonly)

Returns the value of attribute adapter.



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# File 'lib/data_mapper/session.rb', line 10

def adapter
  @adapter
end

Instance Method Details

#all(klass, options = {}) ⇒ Object 



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# File 'lib/data_mapper/session.rb', line 43

def all(klass, options = {})
  @adapter.load(self, klass, options)
end

#create_table(klass) ⇒ Object 



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# File 'lib/data_mapper/session.rb', line 63

def create_table(klass)
  @adapter[klass].create!
end

#delete_all(klass) ⇒ Object 



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# File 'lib/data_mapper/session.rb', line 55

def delete_all(klass)
  @adapter.delete(klass, :session => self)
end

#destroy(instance) ⇒ Object 



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# File 'lib/data_mapper/session.rb', line 51

def destroy(instance)
  @adapter.delete(instance, :session => self)
end

#drop_table(klass) ⇒ Object 



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# File 'lib/data_mapper/session.rb', line 67

def drop_table(klass)
  @adapter[klass].drop!
end

#first(klass, *args, &b) ⇒ Object 



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# File 'lib/data_mapper/session.rb', line 20

def first(klass, *args, &b)
  id = nil
  options = nil
  
  if args.empty? # No id, no options
    options = { :limit => 1 }
  elsif args.size == 2 && args.last.kind_of?(Hash) # id AND options
    options = args.last.merge(:id => args.first)
  elsif args.size == 1 # id OR options
    if args.first.kind_of?(Hash)
      options = args.first.merge(:limit => 1) # no id, add limit
    else
      options = { :id => args.first } # no options, set id
    end
  else
    raise ArgumentError.new('Session#first takes a class, and optional type_or_id and/or options arguments')
  end
  
  options.merge!(b.to_hash) if block_given?
  
  @adapter.load(self, klass, options)
end

#identity_map ⇒ Object 



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# File 'lib/data_mapper/session.rb', line 16

def identity_map
  @identity_map || ( @identity_map = IdentityMap.new )
end

#log ⇒ Object 



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# File 'lib/data_mapper/session.rb', line 83

def log
  @adapter.log
end

#query(*args) ⇒ Object 



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# File 'lib/data_mapper/session.rb', line 75

def query(*args)      
  @adapter.query(*args)
end

#save(instance) ⇒ Object 



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# File 'lib/data_mapper/session.rb', line 47

def save(instance)
  @adapter.save(self, instance)
end

#schema ⇒ Object 



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# File 'lib/data_mapper/session.rb', line 79

def schema
  @adapter.schema
end

#table_exists?(klass) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/data_mapper/session.rb', line 71

def table_exists?(klass)
  @adapter[klass].exists?
end

#truncate(klass) ⇒ Object 



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# File 'lib/data_mapper/session.rb', line 59

def truncate(klass)
  @adapter.delete(klass, :truncate => true, :session => self)
end