Class: DataMapper::Context

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

Defined Under Namespace

Classes: MaterializationError

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(adapter) ⇒ Context

Returns a new instance of Context.



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

def adapter
  @adapter
end

Instance Method Details

#all(klass, options = {}) ⇒ Object 



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

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

#column_exists_for_table?(klass, column_name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/data_mapper/context.rb', line 87

def column_exists_for_table?(klass, column_name)
  @adapter.column_exists_for_table?(klass, column_name)
end

#count(klass, *args) ⇒ Object 



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

def count(klass, *args)
  table(klass).count(*args)
end

#create_table(klass) ⇒ Object 



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

def create_table(klass)
  table(klass).create!
end

#delete_all(klass) ⇒ Object 



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

def delete_all(klass)
  @adapter.delete(self, klass)
end

#destroy(instance) ⇒ Object 



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

def destroy(instance)
  @adapter.delete(self, instance)
end

#drop_table(klass) ⇒ Object 



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

def drop_table(klass)
  table(klass).drop!
end

#execute(*args) ⇒ Object 



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# File 'lib/data_mapper/context.rb', line 91

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

#first(klass, *args) ⇒ Object 



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

def first(klass, *args)
  id = nil
  options = nil
  table = self.table(klass)
  key = table.key
  
  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(key => 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 = { key => args.first } # no options, set id
    end
  else
    raise ArgumentError.new('Context#first takes a class, and optional type_or_id and/or options arguments')
  end
  
  # Account for undesired behaviour in MySQL that returns the
  # last inserted row when the WHERE clause contains a "#{primary_key} IS NULL".
  return nil if options.has_key?(key.name) && options[key.name] == nil
  
  @adapter.load(self, klass, options).first
end

#get(klass, keys) ⇒ Object 



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

def get(klass, keys)
  @adapter.get(self, klass, keys)
end

#identity_map ⇒ Object 



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

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

#logger ⇒ Object 



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# File 'lib/data_mapper/context.rb', line 107

def logger
  @logger || @logger = @adapter.logger
end

#query(*args) ⇒ Object 



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# File 'lib/data_mapper/context.rb', line 95

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

#save(instance) ⇒ Object 



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

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

#schema ⇒ Object 



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# File 'lib/data_mapper/context.rb', line 99

def schema
  @adapter.schema
end

#table(klass) ⇒ Object 



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# File 'lib/data_mapper/context.rb', line 103

def table(klass)
  @adapter.table(klass)
end

#table_exists?(klass) ⇒ Boolean

Returns:

  • (Boolean) 


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

def table_exists?(klass)
  table(klass).exists?
end

#truncate(klass) ⇒ Object 



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

def truncate(klass)
  table(klass).truncate!
end