validates :code, :uniqueness => true, :presence => true
validates :price, :numericality => true
validates :status, :inclusion => {:in => STATUSES}
validates :rate, :presence => true, :numericality => {:less_than => 1, :greater_than => 0}
validate :valid_attribute
def valid_attribute
self.errors.add(:category, 'message') if ****
end
scope
scope :investor, where(:investor => true).order("CONVERT( `name` USING gbk ) ASC")
find
Order.where(["code LIKE ?", "#{quick}%"]).last
test
record = Order.new record.valid? record.errors[:name]
view
<%= raw text -%>
controller
respond_to do |format|
format.html # index.html.erb
format.xml { render :xml => @posts }
end
excecute sql
sql = 'Update * Set column = REPLACE(column, 'src', 'dest') WHERE * ActiveRecord::Base.connection.execute(sql)
date search
where(["DATE(analyse_time) = DATE(?)", params[:date].to_datetime.to_time_in_current_zone])