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More complex inline model field example for SQLAlchemy
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*.sublime-* | ||
.coverage | ||
__pycache__ | ||
examples/sqla-inline/static |
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import os | ||
import os.path as op | ||
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from werkzeug import secure_filename | ||
from sqlalchemy import event | ||
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from flask import Flask, request, render_template | ||
from flask.ext.sqlalchemy import SQLAlchemy | ||
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from wtforms import fields | ||
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from flask.ext import admin | ||
from flask.ext.admin.form import RenderTemplateWidget | ||
from flask.ext.admin.model.form import InlineFormAdmin | ||
from flask.ext.admin.contrib.sqlamodel import ModelView | ||
from flask.ext.admin.contrib.sqlamodel.form import InlineModelConverter | ||
from flask.ext.admin.contrib.sqlamodel.fields import InlineModelFormList | ||
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# Create application | ||
app = Flask(__name__) | ||
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# Create dummy secrey key so we can use sessions | ||
app.config['SECRET_KEY'] = '123456790' | ||
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# Create in-memory database | ||
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///test.sqlite' | ||
app.config['SQLALCHEMY_ECHO'] = True | ||
db = SQLAlchemy(app) | ||
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# Figure out base upload path | ||
base_path = op.join(op.dirname(__file__), 'static') | ||
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# Create models | ||
class Location(db.Model): | ||
id = db.Column(db.Integer, primary_key=True) | ||
name = db.Column(db.Unicode(64)) | ||
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class LocationImage(db.Model): | ||
id = db.Column(db.Integer, primary_key=True) | ||
alt = db.Column(db.Unicode(128)) | ||
path = db.Column(db.String(64)) | ||
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location_id = db.Column(db.Integer, db.ForeignKey(Location.id)) | ||
location = db.relation(Location, backref='images') | ||
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# Register after_delete handler which will delete image file after model gets deleted | ||
@event.listens_for(LocationImage, 'after_delete') | ||
def _handle_image_delete(mapper, conn, target): | ||
try: | ||
if target.path: | ||
os.remove(op.join(base_path, target.path)) | ||
except: | ||
pass | ||
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# This widget uses custom template for inline field list | ||
class CustomInlineFieldListWidget(RenderTemplateWidget): | ||
def __init__(self): | ||
super(CustomInlineFieldListWidget, self).__init__('field_list.html') | ||
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# This InlineModelFormList will use our custom widget | ||
class CustomInlineModelFormList(InlineModelFormList): | ||
widget = CustomInlineFieldListWidget() | ||
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# Create custom InlineModelConverter and tell it to use our InlineModelFormList | ||
class CustomInlineModelConverter(InlineModelConverter): | ||
inline_field_list_type = CustomInlineModelFormList | ||
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# Customized inline form handler | ||
class InlineModelForm(InlineFormAdmin): | ||
form_excluded_columns = ('path',) | ||
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form_label = 'Image' | ||
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def __init__(self): | ||
return super(InlineModelForm, self).__init__(LocationImage) | ||
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def postprocess_form(self, form_class): | ||
form_class.upload = fields.FileField('Image') | ||
return form_class | ||
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def on_model_change(self, form, model): | ||
file_data = request.files.get(form.upload.name) | ||
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if file_data: | ||
model.path = secure_filename(file_data.filename) | ||
file_data.save(op.join(base_path, model.path)) | ||
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# Administrative class | ||
class LocationAdmin(ModelView): | ||
inline_model_form_converter = CustomInlineModelConverter | ||
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inline_models = (InlineModelForm(),) | ||
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def __init__(self): | ||
super(LocationAdmin, self).__init__(Location, db.session, name='Locations') | ||
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# Simple page to show images | ||
@app.route('/') | ||
def index(): | ||
locations = db.session.query(Location).all() | ||
return render_template('locations.html', locations=locations) | ||
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if __name__ == '__main__': | ||
# Create upload directory | ||
try: | ||
os.mkdir(base_path) | ||
except OSError: | ||
pass | ||
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# Create admin | ||
admin = admin.Admin(app, 'Inline Fun') | ||
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# Add views | ||
admin.add_view(LocationAdmin()) | ||
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# Create DB | ||
db.create_all() | ||
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# Start app | ||
app.run(debug=True) |
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{% import 'admin/model/inline_list_base.html' as base with context %} | ||
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{% macro render_field(field) %} | ||
{% set model = field.object_data %} | ||
{% if model and model.path %} | ||
{{ field.form.id }} | ||
<img src="{{ url_for('static', filename=model.path) }}" style="max-width: 300px;"></img> | ||
{% else %} | ||
{{ field }} | ||
{% endif %} | ||
{% endmacro %} | ||
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{{ base.render_inline_fields(field, template, render_field) }} |
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<html> | ||
<body> | ||
{% for loc in locations %} | ||
<h2>{{ loc.name }}</h2> | ||
{% for img in loc.images %} | ||
<img src="{{ url_for('static', filename=img.path) }}" alt="{{ img.alt }}" style="max-width: 300px"></img> | ||
{% endfor %} | ||
<hr/> | ||
{% endfor %} | ||
<a href="/admin">Open admin to upload some images.</a> | ||
</body> | ||
</html> |
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