Module: DB::Model::Statement::Predicate

Defined in:

lib/db/model/statement/predicate.rb

Defined Under Namespace

Classes: Between, Binary, Composite, Empty, Null

Constant Summary

EMPTY =

Empty.new

Class Method Summary

• .coerce(key, value) ⇒ Object
• .where(*arguments, **options, &block) ⇒ Object

Class Method Details

.coerce(key, value) ⇒ Object

# File 'lib/db/model/statement/predicate.rb', line 177

def self.coerce(key, value)
	case value
	when Array
		Binary.new(key, "IN", Tuple.new(value))
	when Range
		if value.min.nil?
			if value.exclude_end?
				Binary.new(key, "<", Literal.new(value.max))
			else
				Binary.new(key, "<=", Literal.new(value.max))
			end
		elsif value.max.nil?
			if value.exclude_end?
				Binary.new(key, ">", Literal.new(value.max))
			else
				Binary.new(key, ">=", Literal.new(value.max))
			end
		else
			if value.exclude_end?
				Composite.new([
					Binary.new(key, ">", Literal.new(value.min)),
					Binary.new(key, "<", Literal.new(value.max))
				])
			else
				Between.new(key, Literal.new(value.min), Literal.new(value.max))
			end
		end
	when nil
		Null.new(key)
	else
		Binary.new(key, "=", Literal.new(value))
	end
end

.where(*arguments, **options, &block) ⇒ Object

# File 'lib/db/model/statement/predicate.rb', line 211

def self.where(*arguments, **options, &block)
	Composite.for(
		options.map do |key, value|
			coerce(Identifier.coerce(key), value)
		end
	)
end