CODEWITHSUNDEEP
ruby
Wolf_Tru
Wolf_Tru

Reputation: 563

How to create dynamic methods using method_missing in ruby modules

I have a module that has a few methods that help find database entries, and I'm trying to create dynamic methods of this sample method: 

def find_by(db_attribute, value)
  rows = connection.execute <<-SQL
    SELECT #{columns.join ","} FROM #{table}
    WHERE #{db_attribute} = #{Record::Utility.sql_strings(value)};
  SQL
end

I want to figure out how to get a call object.find_by_*( * star here being the db_attribute that would normally be in the parameter of find_by) like this: klass.find_by_name('bob') to return the same thing as find_by(:name, 'bob').

Upvotes: 0

Views: 186

Answers (1)

Evan
Evan

Reputation: 941

A very simple solution

def method_missing(method_name, *args, &block)
  if method_name.to_s =~ /^find_by_(.+)$/
    find_by($1.to_sym => args)  # find_by_name, the $1 is `name`
  else
    super(method_name, *args, &block)
  end
end

Upvotes: 3

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