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POSelect records where at least some has_many relations are in the future
 

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  1. POSelect records where at least some has_many relations are in the future
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    <p>I have activities which have_many events - events are the date and time the activities occur. </p> <p>In my activities index, I want to list all activities that have at least one event in the future. </p> <p>I'm using ransack to do my other filtering , suck as categories etc. </p> <p>How can i filter for a greater than condition accross a relation?</p> <p>I thought I would be able to do:</p> <pre><code>obj = search .joins(:event) .where(:events =&gt; ['end_at &gt; ?', Date.today ]) </code></pre> <p>but i get an error:</p> <pre><code>undefined method `join' for #&lt;Ransack::Search:0x007f8aa8eff918&gt; </code></pre> <p><strong>UPDATE</strong> so to give more context, my controler looks like this</p> <pre><code>def index if (params[:oldestchild].present? &amp;&amp; params[:oldestchild].to_i &gt; 0) || (params[:youngestchild].present? &amp;&amp; params[:youngestchild].to_i &gt; 0) @search = Activity .where(' (oldest &gt; ?z and youngest &lt; ?) or (oldest &gt; ? and youngest &lt; ?) ', params[:oldestchild], params[:oldestchild], params[:youngestchild], params[:youngestchild], ) .search(params[:q]) else @search = Activity .search(params[:q]) end @activities = Activity.filter(params, @search, request).includes(:provider).includes(:location) if current_parent and current_parent.children.first @min_child_age = current_parent.min_child_age @max_child_age = current_parent.max_child_age end end </code></pre> <p>and my model has this filter method:</p> <pre><code> def self.filter(params, search, request) obj = search.result(:distinct =&gt; true) # obj = search # .joins(:event) # .where(:events =&gt; ['end_at &gt; ?', Date.today ]) if params[:within].present? &amp;&amp; (params[:within].to_i &gt; 0) obj = obj.where(:location_id =&gt; self.build_locations_array(request)) end if params[:q].present? and params[:q][:category_ids].present? obj = obj .joins(:categories) .where('categories.id' =&gt; params[:q][:category_ids]) end if params[:date_range] == "This month" obj = obj.where(:start =&gt; (Date.today)..(Date.today.at_end_of_month)) end if params[:date_range] == "Next month" date = Date.today + 1.month obj = obj.where(:start =&gt; (date.at_beginning_of_month)..(date.at_end_of_month)) end if params[:date_range] == "Next 3 Months" date = Date.today + 3.month obj = obj.where(:start =&gt; (Date.today)..(date.at_end_of_month)) end if params[:date_range] == "Whenever" obj = obj.where("start &gt; ?", Date.today) end obj.paginate(:page =&gt; params[:page], :per_page =&gt; 5) end </code></pre> <p>UPATE</p> <p>one option that is working, but is fairly ugly is to use sql. </p> <pre><code>obj = search.result(:distinct =&gt; true) .where("exists (select events.id from events where events.activity_id = activities.id and end_at &gt; ?)", Date.today) </code></pre>
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    1. PTQuestion
    1. USWill
    1. USWill
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    1. COCan you just give few more details like, where is this bit of code from? (Model or controller?)
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      1. USBroiSatse
    2. CONothing is going to perform as well as the SQL solution, unless it generates that code. Activerecord could really do with support for EXISTS.
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      1. USDavid Aldridge
 

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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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