Module: DB::Model::Record::Base

Defined in:
lib/db/model/record.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#key_columns ⇒ Object (readonly)

Returns the value of attribute key_columns.



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# File 'lib/db/model/record.rb', line 41

def key_columns
  @key_columns
end

#properties ⇒ Object (readonly)

Returns the value of attribute properties.



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# File 'lib/db/model/record.rb', line 39

def properties
  @properties
end

#relationships ⇒ Object (readonly)

Returns the value of attribute relationships.



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# File 'lib/db/model/record.rb', line 40

def relationships
  @relationships
end

#type ⇒ Object (readonly)

Returns the value of attribute type.



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# File 'lib/db/model/record.rb', line 38

def type
  @type
end

Class Method Details

.extended(klass) ⇒ Object 



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# File 'lib/db/model/record.rb', line 28

def self.extended(klass)
	klass.instance_variable_set(:@properties, {})
	klass.instance_variable_set(:@relationships, {})
	
	klass.instance_variable_set(:@key_columns, [:id].freeze)
	
	default_type = klass.name.split("::").last.gsub(/(.)([A-Z])/,'\1_\2').downcase!.to_sym
	klass.instance_variable_set(:@type, default_type)
end

Instance Method Details

#create(context, **attributes) ⇒ Object

Directly create one record.



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# File 'lib/db/model/record.rb', line 50

def create(context, **attributes)
	Statement::Insert.new(self,
		Statement::Fields.new(attributes.keys),
		Statement::Tuple.new(attributes.values)
	).to_a(context).first
end

#find(context, *key) ⇒ Object

Find records which match the given primary key.



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# File 'lib/db/model/record.rb', line 72

def find(context, *key)
	Statement::Select.new(self,
		where: find_predicate(*key),
		limit: Statement::Limit::ONE
	).to_a(context).first
end

#find_predicate(*key) ⇒ Object 



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# File 'lib/db/model/record.rb', line 79

def find_predicate(*key)
	Statement::Equal.new(self, self.primary_key, key)
end

#insert(context, keys, rows, **attributes) ⇒ Object

Directly insert one or more records.



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# File 'lib/db/model/record.rb', line 58

def insert(context, keys, rows, **attributes)
	if attributes.any?
		fields = Statement::Fields.new(attributes.keys + keys)
		values = attributes.values
		tuples = rows.map{|row| Statement::Tuple.new(values + row)}
	else
		fields = Statement::Fields.new(keys)
		tuples = rows.map{|row| Statement::Tuple.new(row)}
	end
	
	return Statement::Insert.new(self, fields, Statement::Multiple.new(tuples)).to_a(context)
end

#primary_key ⇒ Object 



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# File 'lib/db/model/record.rb', line 43

def primary_key
	@key_columns.map do |name|
		DB::Identifier[@type, name]
	end
end

#property(name, klass = nil) ⇒ Object 



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# File 'lib/db/model/record.rb', line 87

def property(name, klass = nil)
	if @properties.key?(name)
		raise ArgumentError.new("Property #{name.inspect} already defined!")
	end
	
	@properties[name] = klass
	
	if klass
		self.define_method(name) do
			if @changed&.key?(name)
				return @changed[name]
			elsif @attributes.key?(name)
				value = @attributes[name]
				klass.load(value)
			else
				nil
			end
		end
	else
		self.define_method(name) do
			if @changed&.key?(name)
				return @changed[name]
			else
				@attributes[name]
			end
		end
	end
	
	self.define_method(:"#{name}=") do |value|
		@changed ||= Hash.new
		@changed[name] = value
	end
	
	self.define_method(:"#{name}?") do
		value = self.send(name)
		
		if !value
			false
		elsif value.respond_to?(:empty?)
			!value.empty?
		else
			true
		end
	end
end

#where(context, *arguments, **options, &block) ⇒ Object 



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# File 'lib/db/model/record.rb', line 83

def where(context, *arguments, **options, &block)
	Where.new(context, self, *arguments, **options, &block)
end