[IMP][9.0] Change Requests and workflow improvements on documents (#155)

* [IMP] Refactor document_page_approval to always use states, and a few code improvements
* [IMP] Add QWeb report to print document pages
* Categories don't save content
* FIX Last Contributor (uid and date). Use related fields instead of computed where possible.
Fix search views, store some fields to make them searchable, added filters
* Add api.depends on computed diff

document_page/models/document_page_history.py

@@ -18,11 +18,8 @@
 #    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 ##############################################################################
-import logging
 import difflib
-from openerp import models, fields, _
-
-_logger = logging.getLogger(__name__)
+from openerp import models, fields, api, _
 
 
 class DocumentPageHistory(models.Model):
@@ -31,24 +28,40 @@ class DocumentPageHistory(models.Model):
     _name = "document.page.history"
     _description = "Document Page History"
     _order = 'id DESC'
-    _rec_name = "create_date"
 
-    page_id = fields.Many2one('document.page', 'Page')
+    page_id = fields.Many2one('document.page', 'Page', ondelete='cascade')
     summary = fields.Char('Summary', index=True)
     content = fields.Text("Content")
-    create_date = fields.Datetime("Date")
-    create_uid = fields.Many2one('res.users', "Modified By")
+    diff = fields.Text(compute='_compute_diff')
 
+    @api.multi
+    @api.depends('content', 'page_id.history_ids')
+    def _compute_diff(self):
+        """Shows a diff between this version and the previous version"""
+        history = self.env['document.page.history']
+        for rec in self:
+            prev = history.search([
+                ('page_id', '=', rec.page_id.id),
+                ('create_date', '<', rec.create_date)],
+                limit=1,
+                order='create_date DESC')
+            if prev:
+                rec.diff = self.getDiff(prev.id, rec.id)
+            else:
+                rec.diff = self.getDiff(False, rec.id)
+
+    @api.model
     def getDiff(self, v1, v2):
         """Return the difference between two version of document version."""
-        text1 = self.browse(v1).content
-        text2 = self.browse(v2).content
-        line1 = line2 = ''
-        if text1:
-            line1 = text1.splitlines(1)
-        if text2:
-            line2 = text2.splitlines(1)
-        if (not line1 and not line2) or (line1 == line2):
+        text1 = v1 and self.browse(v1).content or ''
+        text2 = v2 and self.browse(v2).content or ''
+        # Include line breaks to make it more readable
+        # TODO: consider using a beautify library directly on the content
+        text1 = text1.replace('</p><p>', '</p>\r\n<p>')
+        text2 = text2.replace('</p><p>', '</p>\r\n<p>')
+        line1 = text1.splitlines(1)
+        line2 = text2.splitlines(1)
+        if line1 == line2:
             return _('There are no changes in revisions.')
         else:
             diff = difflib.HtmlDiff()
@@ -58,3 +71,11 @@ class DocumentPageHistory(models.Model):
                 "Revision-{}".format(v2),
                 context=True
             )
+
+    @api.multi
+    def name_get(self):
+        result = []
+        for rec in self:
+            name = "%s #%i" % (rec.page_id.name, rec.id)
+            result.append((rec.id, name))
+        return result