paper_trail show log of changes to a member (no method for each error)

Question

I'm trying to show a log for changes on a particular member in the show view. The members information is there and the version history is working.

I'm having troubles showing versions/changes log for that particular member. I get this error:

 ActionView::Template::Error (undefined method `each' for #<PaperTrail::Version:0x007f55f23ee348>): 

I have this in my controller:

    # Detailed Member Profile
    def show
        @versions = PaperTrail::Version.find(params[:id])
        @members_main = Members::Main.find(params[:id])
    end

And this in my show view:

<div class="row">
    <div class="col-md-6">

    </div>
    <div class="col-md-6">
        <% @versions.each do |version| %>
            <li>
                <%= l(version.created_at, format: "%-d.%m.%Y %H:%M:%S %Z") %><br/>
                Event ID: <%= version.id %><br/>
                <b>Target:</b> <%= version.item_type %>
                <small>(id: <%= version.item_id %>)</small>; <b>action</b> <%= version.event %>;<br/>
                <div>
                    More info:
                    <pre><%= version.object %></pre>
                </div>
            </li>
        <% end %>
    </div>
</div>

Model:

class Members::Main < ActiveRecord::Base

    # Add Paper Trail
    has_paper_trail

end

Answer 1

I think the find method of the ActiveRecord returns only one object. And that object does not have an each method.

See the documentation here.

In particular this line @versions = PaperTrail::Version.find(params[:id]). It returns an object for the given id. But that object does not have a method called each. That is your error text.

What you probably expected was that it returns an array, but it obviously did not.

Try to change it to @versions = PaperTrail::Version.find([params[:id]]) and I believe it should work. Note the brackets.