ror How can i order by has many value - ruby-on-rails

Question

How can I order by has-many value
I want to do something like #cases = #user.cases.order_by(step.name="shipped" desc)
I have cases table and I want if the case.step.name = "Shipped" to be at the end of the table
I have case model
has_many :steptations, dependent: :destroy
has_many :steps, through: :steptations
accepts_nested_attributes_for :steps
and step model
has_many :steptations,dependent: :destroy
has_many :cases, through: :steptations
Here is my cases controller
def index
#cases = #user.cases.all
end
Here is my case.html
<% #cases.each do |item| %><tr>
<td ><%= link_to case_path(item) do %><%= item.number %><% end %></td>
<% if item.steptations.present? %>
<% item.steptations.where(:status=>true).each do |t| %>
<% if t.step&.id == 13 %>
<td class= 'fa fa-circle red' ></td>
<% elsif item.finished == true && t.step&.name == "Shipped"%>
<td class= 'fa fa-circle red' ></td>
<% elsif item.finished == true %>
<td class= 'fa fa-circle dark'></td>
<% else %>
<td class= 'fa fa-circle green'></td>
<% end %>
<% end %>
<% else %>
<td>0</td>
<% end %>
<td> <%= link_to case_path(item) do %><%= item.pt_first_name.capitalize %> <%= item.pt_last_name.capitalize %><% end %></td>
<td><%=link_to item.user.full_name,doctor_path(item.user)%></td>
<td> <%= item.date_received.strftime("%b-%-d-%-y") %></td>
<td> <%= item.due_date.strftime("%b-%-d-%-y") %></td>
<td><%= item.shade %></td>
<td><%= item.mould %></td>
<td><%= item.upper_lower %></td>
<% if item.steptations.present? %>
<% item.steptations.where(:status=>true).each do |t| %>
<% if t.step&.name == "Conversion" %>
<td class="red"><%= t.step&.name%></td>
<% else %>
<td><%= t.step&.name%> </td>
<% end %>
<% end %>
<% else %>
<td>0</td>
<% end %>
</td>
</tr>
<% end %></tbody>
</table><br>

Answer 1

What you're looking for is the SQL ORDER BY FIELD function. In Ruby it should be something like this:
Case.where(user: #user).order("FIELD(name, #{some name param variable}) desc")

Answer 2

Try this:
Case.joins(steptations: :step)
.group("cases.id")
.select("cases.*,
COUNT(steps.name) filter (where steps.name = 'shipped') as shipped")
.order(:shipped)