Add support to search documents and document pages by checksum.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

docs/releases/2.5.rst

@@ -52,7 +52,7 @@ Other Changes
 - It is now possible to change the relationship between metadata types and
   document types from either the metadata type list or document type list.
   GitLab issue #373.
-
+- Add support to search documents by their checksums.
 
 Removals
 --------

mayan/apps/documents/search.py

@@ -20,6 +20,9 @@ document_search.add_model_field(
 )
 document_search.add_model_field(field='label', label=_('Label'))
 document_search.add_model_field(field='description', label=_('Description'))
+document_search.add_model_field(
+    field='versions__checksum', label=_('Checksum')
+)
 
 document_page_search = SearchModel(
     app_label='documents', model_name='DocumentPageResult',
@@ -41,3 +44,6 @@ document_page_search.add_model_field(
 document_page_search.add_model_field(
     field='document_version__document__description', label=_('Description')
 )
+document_page_search.add_model_field(
+    field='document_version__checksum', label=_('Checksum')
+)