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Contents
# frozen_string_literal: true
require 'rom/sql/dsl'
require 'rom/sql/function'
module ROM
module SQL
# Projection DSL used in reading API (`select`, `select_append` etc.)
#
# @api public
class ProjectionDSL < DSL
# Return a string literal that will be directly used in an SQL statement or query
#
# @example
# users.select { `'FOO'`.as(:foo) }.first
# # => { :foo => "FOO" }
#
# @param [String] value A string object
#
# @return [Attribute] An SQL attribute with a string literal expression
#
# @api public
def `(value)
expr = ::Sequel.lit(value)
::ROM::SQL::Attribute.new(type(:string)).meta(sql_expr: expr)
end
# Return a SQL function with value `Any`
#
# @example
# users.select { function(:count, :id).as(:total) }
#
# @param [Symbol] name SQL function
# @param [Symbol] attrs
#
# @return [Rom::SQL::Function]
#
# @api public
def function(name, *attrs)
::ROM::SQL::Function.new(::ROM::Types::Any, schema: schema).public_send(name, *attrs)
end
alias_method :f, :function
# @api private
def respond_to_missing?(name, include_private = false)
super || type(name)
end
private
# @api private
def method_missing(meth, *args, &block)
if schema.key?(meth)
schema[meth]
else
type = type(meth)
if type
if args.empty?
::ROM::SQL::Function.new(type, schema: schema)
else
::ROM::SQL::Attribute[type].value(args[0])
end
else
super
end
end
end
end
end
end
Version data entries
9 entries across 9 versions & 1 rubygems