How to make a view that groups nodes by taxonothe term

The solution is simple, in views you can sort your result by the taxonomy term. You have 3 options as default.

From the views interface:

• Term Taxonomy terms. Note that using this can cause duplicate nodes to appear in views; you must add filters to reduce the result set.
• Term ID The taxonomy term ID
• Taxonomy Weight The term weight field

The sorting in views, is located in the top right corner, and gives a wealth of options as to how you want to sort your results.

Edit:
Duplicates is a known problem with taxonomy terms. The problem is that if a node has two terms that fit it will be included once for each term. When you use the taxonomy term filter, you can reduce duplicates, which should fix your problem:

http://grab.by/16vw

I got it! Solution

Node view

• View machine name: node_view_machine_name
• Type: Block
• Fields
  • Title
  • Field 1
  • Field 2
• Filter
  • Content type (= My content Type)
• Contextual filters
  • Child taxonomy field
  • Hide view when filter is not available

Taxonomy view

• Type: page
• Filter
  • Taxonomy term: Vocabulary (= My Vocabulary)
• Relationship
  • Taxonomy term: Parent term
• Fields
  • Taxonomy term: Name
    • Relationship: parent
    • Exclude from display
  • Taxonomy term: ID <- We use this id to pass as argument to the node view
    • Relationship: none
    • Exclude from display
  • Taxonomy term: Name
    • Relationship: none
  • Global PHP <- Print node detail related for each child term
    • Output code:

$viewNodeDetail = views_get_view('node_view_machine_name');
$viewNodeDetail ->set_arguments(array($row->tid));
print $viewNodeDetail ->render('block');

• Format
  • Group by
  • (Parent) Taxonomy term: Name

I hope can be useful for someone else!