search for: has_and_belong_to_mani

I have 2 models: mop, has_and_belong_to_many :contacts contact, has_and_belong_to_many :mops when I save my mop Ii have the users coming in a an array: ["9",10"] I am doing this to asscociate each one to a mop: @contacts.each do |contact| @mop.contacts << contact end Contact(#44950470) expected, got String(#20837400) It is giving me the above error. Any ideas?

Hello, I''m trying to insert into my migrate but when I try on rails console this error shows: 1.9.3-p0 :001 > group = Group.new => #<Group id: nil, name: nil, description: nil, created_at: nil, updated_at: nil> 1.9.3-p0 :002 > group.name = "Group Name" => "Group Name" 1.9.3-p0 :003 > group.description = "Description" =>

Consider the following scenario: Book has_and_belong_to_many Category. In other words, a category may have a lot of books, and a book can have more than one category. What is the best practice to query all books related to some specified categories. For example, if I have following books "From Java To Ruby" - Category: Java, Ruby "Ruby Programming" - Category: Ruby

Ok, to keep things short. Im wondering if I need a secondary relationship table to handle my many-to-one relationships. Here is an example of what I''ve written down. For instance say I want to find all of the people in a given location. class Location < AR:Base has_many :people end class Person < AR:Base belongs_to :location end My SQL tables look like: CREATE TABLE

Hi folks, I am in the process of converting an existing non-rails application to rails, and am not sure what the best approach would be for specifying the relationship between the two sets of data. I''ll describe the existing table structures first. Table 1: Urls Each url has a unique id and two lists of Phrases, these are currently setup as varchars with "," delimitation -

Hello all, I have a product table and an option table that are connected to one another via a join table. These two tables both contain has_and_belong_to_many relationships with each other. I am trying to setup a page where I will create a product and add in its options. I have already populated the options table with data to draw from. so, to start, here is the method from my controller: def

Hello all, I''ve been working with Ruby on Rails for a few weeks now. It''s difficult for me because I don''t have much experience with Ruby, Rails, MySQL, or any other web-languages. But I''m trudging on and learning a lot. I''ve been working on a web application for my dad''s website; it''s a simple content manager for