Rails test for key in hstore column

Question

I have a Rails 4 app where the model Vehicle has an hstore column called data. The app is also using gem 'acts_as_tenant'. The model Tenant also has an hstore column called data.

What I'm doing is storing user defined fields in Tenant for the Vehicle table. In other words if the Tenant data (hstore) column contains 'color', then I want every Vehicle to have that same key in their data (hstore) column.

This is the code for the Vehicle form:

   <% if current_tenant.data.present? %>
        <%= f.simple_fields_for :data do |d| %>
            <% current_tenant.data.each do |key, value| unless ???????@vehicle.data%>
                <div class="row">
                  <p class='col-md-3'>
                    <%= text_field_tag key, key, :class => 'text_field dynamicAttributeName' %>
                  </p>
                  <p class='col-md-3'>
                    <%= d.text_field key, :class => 'text_field', :value => value %>
                  </p>
                  <p class='col-md-1'>
                    <a herf='#' class='btn removeRow'>X</a>
                  </p>
                </div>
            <% end %>
        <%- end -%>
    <% end %>

    <% if @vehicle.data.present? %>
        <%= f.simple_fields_for :data do |d| %>
            <% @vehicle.data.each do |key, value| %>
                <div class="row">
                  <p class='col-md-3'>
                    <%= text_field_tag key, key, :class => 'text_field dynamicAttributeName' %>
                  </p>
                  <p class='col-md-3'>
                    <%= d.text_field key, :class => 'text_field', :value => value %>
                  </p>
                  <p class='col-md-1'>
                    <a herf='#' class='btn removeRow'>X</a>
                  </p>
                </div>
            <% end %>
        <%- end -%>
    <% end %> 

My issue is the line <% current_tenant.data.each do |key, value| unless ???????

I don't want to add the same key twice. So, if the Vehicle data field already has color, I don't want to add it again.

How do I test the Vehicle.data field to see if it has a key equal to the current_tenant.data.each do |key, value|.

Thanks for the help!!!

Answer 1

At its core, an hstore column defined on a Rails model via store_accessor :data acts just like a hash does, as you've seen.

You could do a simple check to see if the vehicle.data hash has the key you are looking for.

Something like:

current_tenant.data.each do |key, value|
  puts "#{key} => #{value}" unless vehicle.data.key?(key)
end

would print the key value pair unless the vehicle hstore column also had the same key