Fix bugs with select dropdown and multiselection

app/assets/javascripts/gl_dropdown.js.coffee

@@ -231,6 +231,13 @@ class GitLabDropdown
       html = @options.renderRow(data)
     else
       selected = if @options.isSelected then @options.isSelected(data) else false
+      if not selected
+        value = if @options.id then @options.id(data) else data.id
+        fieldName = @options.fieldName
+        field = @dropdown.parent().find("input[name='#{fieldName}'][value='#{value}']")
+        if field.length
+          selected = true
+
       url = if @options.url then @options.url(data) else "#"
       text = if @options.text then @options.text(data) else ""
       cssClass = "";
@@ -271,9 +278,10 @@ class GitLabDropdown
     field = @dropdown.parent().find("input[name='#{fieldName}'][value='#{value}']")
 
     if el.hasClass(ACTIVE_CLASS)
-      if @options.multiSelect
-        console.log field.val(), value
-      else
+      console.log 'has ACTIVE_CLASS'
+      # if @options.multiSelect
+      #   console.log field.val(), value
+      # else
       field.remove()
     else
       fieldName = @options.fieldName
@@ -286,11 +294,7 @@ class GitLabDropdown
       if !value?
         field.remove()
 
-      if @options.multiSelect
-        oldValue = field.val()
-        if oldValue
-          value = "#{oldValue},#{value}"
-      else
+      if not @options.multiSelect
         @dropdown.find(".#{ACTIVE_CLASS}").removeClass ACTIVE_CLASS
 
       # Toggle active class for the tick mark
@@ -299,14 +303,13 @@ class GitLabDropdown
       # Toggle the dropdown label
       if @options.toggleLabel
         $(@el).find(".dropdown-toggle-text").text @options.toggleLabel(selectedObject)
-
       if value?
         if !field.length
           # Create hidden input for form
-          input = "<input type='hidden' name='#{fieldName}' />"
+          input = "<input type='hidden' name='#{fieldName}' value='#{value}' />"
           @dropdown.before input
-
-        @dropdown.parent().find("input[name='#{fieldName}']").val value
+        else
+          console.log 'has field???'
 
   selectFirstRow: ->
     selector = '.dropdown-content li:first-child a'

app/views/shared/issuable/_sidebar.html.haml

@@ -65,7 +65,8 @@
             .light None
 
         .selectbox.hide-collapsed
-          = dropdown_tag("Milestone", options: { title: "Assign milestone", toggle_class: 'js-milestone-select', filter: true, dropdown_class: "dropdown-menu-selectable", placeholder: "Search milestones", data: { show_no: true, field_name: "milestone_id", project_id: @project.id, issuable_id: issuable.id, milestones: namespace_project_milestones_path(@project.namespace, @project, :json), issue_update: namespace_project_issue_path(@project.namespace, @project, issuable.id, :json), use_id: true }})
+          = f.hidden_field 'milestone_id', value: issuable.milestone.id, id: nil
+          = dropdown_tag("Milestone", options: { title: "Assign milestone", toggle_class: 'js-milestone-select', filter: true, dropdown_class: "dropdown-menu-selectable", placeholder: "Search milestones", data: { show_no: true, field_name: "issue[milestone_id]", project_id: @project.id, issuable_id: issuable.id, milestones: namespace_project_milestones_path(@project.namespace, @project, :json), issue_update: namespace_project_issue_path(@project.namespace, @project, issuable.id, :json), use_id: true }})
 
       - if issuable.project.labels.any?
         .block.labels
@@ -85,7 +86,8 @@
             - else
               .light None
           .selectbox.hide-collapsed
-            = f.hidden_field 'label_name', value: issuable.labels.map(&:id).join(',')
+            - issuable.labels.each do |label|
+              = f.hidden_field 'label_name', value: label.id, id: nil
             .dropdown
               %button.dropdown-menu-toggle.js-label-select.js-multiselect{type: "button", data: {toggle: "dropdown", field_name: "issue[label_name]", show_no: "true", show_any: "true", selected: issuable.label_names.join(","), project_id: (@project.id if @project), issue_update: namespace_project_issue_path(@project.namespace, @project, issuable.id, :json), labels: (namespace_project_labels_path(@project.namespace, @project, :json) if @project)}}
                 %span.dropdown-toggle-text