Question

Let’s say I have a model, Animal, and a column, animal_name. When a user enter chicken, I want to check in the Animal model if there is animal_name “chicken”. Assuming the @animal variable carries a value that user entered, how do I check that value exists in the animal_name column?

def check_animal
    if @animal......... #Exists in Animal model
end

Answer 1

Either one of these two forms:

• Animal.find_by_name("chicken")
• Animal.where(:name => "chicken")

Or using a variable:

• Animal.find_by_name(@animal_name)
• Animal.where(:name => @animal_name)

See:

• Ruby on Rails 3.0 Release Notes

• Active Record Query Interface 3.0