X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/6f6235983d91e0b9fb5660d0a2825f510bbdac73..ff9f9c7e1a664a36bcffd54c7269c08d5bf1d436:/apps/workbench/app/models/arvados_resource_list.rb

diff --git a/apps/workbench/app/models/arvados_resource_list.rb b/apps/workbench/app/models/arvados_resource_list.rb
index 1e2e720d4e..1a3c6b7e3c 100644
--- a/apps/workbench/app/models/arvados_resource_list.rb
+++ b/apps/workbench/app/models/arvados_resource_list.rb
@@ -2,7 +2,7 @@ class ArvadosResourceList
   include ArvadosApiClientHelper
   include Enumerable
 
-  def initialize(resource_class)
+  def initialize resource_class=nil
     @resource_class = resource_class
   end
 
@@ -26,6 +26,17 @@ class ArvadosResourceList
     self
   end
 
+  def select(columns=nil)
+    # If no column arguments were given, invoke Enumerable#select.
+    if columns.nil?
+      super()
+    else
+      @select ||= []
+      @select += columns
+      self
+    end
+  end
+
   def filter _filters
     @filters ||= []
     @filters += _filters
@@ -64,6 +75,7 @@ class ArvadosResourceList
     api_params[:eager] = '1' if @eager
     api_params[:limit] = @limit if @limit
     api_params[:offset] = @offset if @offset
+    api_params[:select] = @select if @select
     api_params[:order] = @orderby_spec if @orderby_spec
     api_params[:filters] = @filters if @filters
     res = arvados_api_client.api @resource_class, '', api_params
@@ -91,6 +103,12 @@ class ArvadosResourceList
     self
   end
 
+  def collect
+    results.collect do |m|
+      yield m
+    end
+  end
+
   def first
     results.first
   end
@@ -135,4 +153,38 @@ class ArvadosResourceList
     results.offset if results.respond_to? :offset
   end
 
+  def result_links
+    results.links if results.respond_to? :links
+  end
+
+  # Return links provided with API response that point to the
+  # specified object, and have the specified link_class. If link_class
+  # is false or omitted, return all links pointing to the specified
+  # object.
+  def links_for item_or_uuid, link_class=false
+    return [] if !result_links
+    unless @links_for_uuid
+      @links_for_uuid = {}
+      result_links.each do |link|
+        if link.respond_to? :head_uuid
+          @links_for_uuid[link.head_uuid] ||= []
+          @links_for_uuid[link.head_uuid] << link
+        end
+      end
+    end
+    if item_or_uuid.respond_to? :uuid
+      uuid = item_or_uuid.uuid
+    else
+      uuid = item_or_uuid
+    end
+    (@links_for_uuid[uuid] || []).select do |link|
+      link_class == false or link.link_class == link_class
+    end
+  end
+
+  # Note: this arbitrarily chooses one of (possibly) multiple names.
+  def name_for item_or_uuid
+    links_for(item_or_uuid, 'name').first.andand.name
+  end
+
 end