Update

app/corpora/views.py

@@ -19,7 +19,7 @@ def add_corpus():
     if add_corpus_form.validate_on_submit():
         corpus = Corpus(creator=current_user,
                         description=add_corpus_form.description.data,
-                        title=add_corpus_form.title.data)
+                        status='unprepared', title=add_corpus_form.title.data)
         db.session.add(corpus)
         db.session.commit()
         dir = os.path.join(current_app.config['OPAQUE_STORAGE_DIRECTORY'],
@@ -113,6 +113,7 @@ def add_corpus_file(corpus_id):
                                  corpus=corpus, dir=dir, filename=filename,
                                  publishing_year=add_corpus_file_form.publishing_year.data,
                                  title=add_corpus_file_form.title.data)
+        corpus_file.insert_metadata()
         db.session.add(corpus_file)
         db.session.commit()
         flash('Corpus file added!')
@@ -166,6 +167,7 @@ def edit_corpus_file(corpus_id, corpus_file_id):
         corpus_file.author = edit_corpus_file_form.author.data
         corpus_file.publishing_year = edit_corpus_file_form.publishing_year.data
         corpus_file.title = edit_corpus_file_form.title.data
+        corpus_file.insert_metadata()
         db.session.commit()
         flash('Corpus file edited!')
         return redirect(url_for('corpora.corpus', corpus_id=corpus_id))

app/models.py

@@ -424,6 +424,9 @@ class CorpusFile(db.Model):
         db.session.delete(self)
         db.session.commit()
 
+    def insert_metadata(self):
+        pass
+
 
 class Corpus(db.Model):
     """
@@ -436,16 +439,12 @@ class Corpus(db.Model):
     description = db.Column(db.String(255))
     title = db.Column(db.String(32))
     user_id = db.Column(db.Integer, db.ForeignKey('users.id'))
-    status = db.Column(db.String(16))
     # Relationships
     files = db.relationship('CorpusFile',
                             backref='corpus',
                             lazy='dynamic',
                             cascade='save-update, merge, delete')
 
-    def __init__(self, **kwargs):
-        super(Corpus, self).__init__(**kwargs)
-
     def __repr__(self):
         """
         String representation of the corpus. For human readability.
@@ -482,6 +481,9 @@ class Corpus(db.Model):
         db.session.delete(self)
         db.session.commit()
 
+    def prepare(self):
+        pass
+
 
 '''
 ' Flask-Login is told to use the application’s custom anonymous user by setting

app/utils.py

@@ -1,4 +1,4 @@
-from .models import Job, User, Corpus
+from .models import Job, User, Corpus, CorpusFile
 from . import db
 import logging
 
@@ -64,3 +64,8 @@ def background_delete_corpus(app, corpus_id):
         logger.warning('Corpus id is: {}.'.format(corpus_id))
         corpus = Corpus.query.filter_by(id=corpus_id).first()
         corpus.delete()
+
+
+def background_prepare_corpus_file(app, corpus_file_id):
+    with app.app_context():
+        corpus_file = CorpusFile.query.filter_by(id=corpus_file_id).first()