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POLike/Unlike Without Ajax or jQuery on Rails
 

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    <p>I'm trying to implement a simple like/unlike function. All the examples I have seen here seem to apply to ajax or jquery. I.m still a beginner and I don't fully understand either yet, I just want a simple solution.</p> <p>My idea is, I have books and I have users. Users can like books. So I have created a many-to-many association through a Like model. The Like model has a corresponding database with book_id and user_id columns. Thus: </p> <pre><code>class Book &lt; ActiveRecord::Base has_many :likes has_many :users, through: :likes class User &lt; ActiveRecord::Base has_many :likes has_many :books, through: :likes class Like &lt; ActiveRecord::Base belongs_to :book belongs_to :user end </code></pre> <p>unfortunately, this is as far as my understanding goes. I do not know how to utilize this relationship to create likes and associate them with the appropriate book and user.</p> <p>My idea is to present the user a 'like' button if he has not liked the book, or unlike if he hasn't. So basically, I want to have something this simple:</p> <pre><code>&lt;% if user likes? %&gt; &lt;div class="unlike_button"&gt;&lt;%= link_to "Unlike", '#' %&gt;&lt;/div&gt; &lt;% else %&gt; &lt;div class="like_button"&gt;&lt;%= link_to "Like", '#' %&gt;&lt;/div&gt; &lt;% end %&gt; </code></pre> <p>I used the # stub because I have no idea what route it should use. But whatever the solution is, I would like it to redirect to the same page with a flash notice saying "liked" or "Unlike". I already have div background images for the like_button and unlike_button classes, which is why I implement them as image links above.</p> <p>Any sort of guidance or help, would be deeply appreciated. Thanks</p> <p><em>UPDATE</em></p> <p>I'm following Bennick's guidance here below but I', still stuck in the rails console. I figure there's no point moving forward if I'm getting errors in the console.</p> <p>As suggested, I tried this in the console:</p> <p>As I already have users I did <code>user = User.find(1)</code>and <code>book = Book.find(1)</code></p> <p>But on the next line <code>like = Like.create(:user =&gt; user, :book =&gt; book)</code>the returned a mass assign error. <code>Can't mass-assign protected attributes: book, user</code> I figured maybe this would help <code>attr_accessible :book_id, :user_id</code> in the like model but I still get errors. Am I missing something?</p> <p><em>SOLVED</em></p> <p>I finally got it to work! Using <code>like = Like.create(:user =&gt; user.id, :book =&gt; book.id)</code>. </p>
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