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--- wiki2:python:flask:flaskmongoengine [2015/08/08 14:13]
alfred [Setting up the DB]
+++ wiki2:python:flask:flaskmongoengine [2020/05/09 09:25] (actual)
@@ Línea 43: / Línea 43: @@
 app.config['MONGODB_USERNAME'] = 'webapp'
 app.config['MONGODB_PASSWORD'] = 'pwd123'
+</code>
+==== Model ====
+<code python>
+from app import db
+class Post(db.Document):
+    created_at = db.DateTimeField(default=datetime.datetime.now, required=True)
+    title = db.StringField(max_length=255, required=True)
+    slug = db.StringField(max_length=255, required=True)
+    body = db.StringField(required=True)
+    comments = db.ListField(db.EmbeddedDocumentField('Comment'))
+    def get_absolute_url(self):
+        return url_for('post', kwargs={"slug": self.slug})
+    def __unicode__(self):
+        return self.title
+    meta = {
+        'allow_inheritance': True,
+        'indexes': ['-created_at', 'slug'],
+        'ordering': ['-created_at']
+    }
+</code>
+==== Use ====
+Flask MongoEngine attaches methods to MongoEngine:
+  * get_or_404: works like .get(), but calls abort(404) if the object DoesNotExist.
+  * first_or_404: same as above, except for .first().
+  * paginate: paginates the QuerySet. Takes two arguments, page and per_page.
+  * paginate_field: paginates a field from one document in the QuerySet. Arguments: field_name, doc_id, page, per_page.
+<code python>
+# 404 if object doesn't exist
+def view_todo(todo_id):
+    todo = Todo.objects.get_or_404(_id=todo_id)
+..
+# Paginate through todo
+def view_todos(page=1):
+    paginated_todos = Todo.objects.paginate(page=page, per_page=10)
+# Paginate through tags of todo
+def view_todo_tags(todo_id, page=1):
+    todo = Todo.objects.get_or_404(_id=todo_id)
+    paginated_tags = todo.paginate_field('tags', page, per_page=10)
+</code>
+You can use them in templates:
+<code>
+{% macro render_pagination(pagination, endpoint) %}
+  <div class=pagination>
+  {%- for page in pagination.iter_pages() %}
+    {% if page %}
+      {% if page != pagination.page %}
+        <a href="{{ url_for(endpoint, page=page) }}">{{ page }}</a>
+      {% else %}
+        <strong>{{ page }}</strong>
+      {% endif %}
+    {% else %}
+      <span class=ellipsis>…</span>
+    {% endif %}
+  {%- endfor %}
+  </div>
+{% endmacro %}
+</code>
+===== Other uses =====
+==== Session storage ====
+To use MongoEngine as your session store simple configure the session interface:
+<code python>
+from flask.ext.mongoengine import MongoEngine, MongoEngineSessionInterface
+app = Flask(__name__)
+db = MongoEngine(app)
+app.session_interface = MongoEngineSessionInterface(db)
+</code>
+==== Debug Toolbar Panel ====
+If you use the Flask-DebugToolbar you can add ‘flask.ext.mongoengine.panels.MongoDebugPanel’ to the DEBUG_TB_PANELS config list and then it will automatically track your queries.
+<code python>
+from flask import Flask from flask_debugtoolbar import DebugToolbarExtension
+app = Flask(__name__)
+app.config[‘DEBUG_TB_PANELS’] = [‘flask.ext.mongoengine.panels.MongoDebugPanel’]
+db = MongoEngine(app)
+toolbar = DebugToolbarExtension(app)
 </code>

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