How to correctly make an object template in a list in Jade?

Question

JavaScript

Hello.
I'm just starting to work with Jade, I sort of figured everything out, but due to lack of experience I can't implement the planned thing yet, I hope for help.
There is a list of objects (ads) of this kind: prntscr.com/a28x8a . I'm trying to make the layout of an object be done in a mixin. Everything seems simple, but there are several points that interest me:
1. Some objects have things that others may not have, for example: a picture, "urgent", "bargaining is possible" - prntscr.com/a290ay . You also need to show the type of object added to "Favorites": prntscr.com/a290vh . What is the best way to implement this?
Now my mixin looks like this:

mixin list-item(in_favorites, urgent, img_multiple, img, price, discount, title)
  .sr-list-item.media&attributes(attributes)
    .media-body
      .sr-list-item-img(class="#{img_multiple}")
        if img
          a(href="#")
            img(src="#{img}", alt="")
        else
          |  
      .media-body
        .sr-list-item-price= price
          if discount
            span= discount
        .sr-list-item-title
          if in_favorites
            a.sr-list-item-fav.active(href="#", title="Удалить из избранного")
          else
            a.sr-list-item-fav(href="#", title="Добавить в избранное")
          h3
            if urgent
              span.label.label-urgent срочно
            a(href="#")= title
        ul.sr-list-item-options
          li
            |Площадь: 
            span
              | Общая 50м
              sup 2
            span
              | , Жилая 38м
              sup 2
            span 
              | , Кухня 8м
              sup 2
          li 
            | Тип дома:
            span Панельный
          li
            | Этаж: 
            span 2/1
          li.sr-list-item-options-inline
            div Львов
            div 21.05.2015
            div
              a.c-link-icon(href="#")
                i.fa.fa-user
                | 
                span Александра

And I output an object with data like this:

+list-item('', 'urgent', 'sr-list-item-img_multiple', 'http://placehold.it/140x100', '500 грн.', 'Торг возможен', 'Сдам квартиру на Советской')(class="selected")

Looks rough and incomprehensible.
2. Also, I'm wondering if it's possible to insert data into the mixin as objects in an array, like this:

+list-item([{favorites: '', urgent: 'urgent'}, {multiple_images: 'sr-list-item-img_multiple'}, ... }])

To make it clear where the picture is, where the title is, where the price is, etc., because at the moment it is difficult to remember what is where. I tried to do this, but then nothing was displayed on the page, and the image url was written "object Object".
Thank you!

Answer 1

mixin list-item(params)
  if params.parameter
    span=params.parameter

+list-item({parameter:'yes, you can'})