<p>无需立即使用应用程序初始化<code>flask_sqlalchemy</code>模块-您可以改为:</p>
<pre><code># apps.members.models
from flask_sqlalchemy import SQLAlchemy
db = SQLAlchemy()
class Member(db.Model):
# fields here
pass
</code></pre>
<p>然后在应用程序设置中,可以调用<code>init_app</code>:</p>
<pre><code># apps.application.py
from flask import Flask
from apps.members.models import db
app = Flask(__name__)
# later on
db.init_app(app)
</code></pre>
<p>这样你就可以避免周期性的进口。</p>
<p>这种模式不需要将所有模型放在一个文件中。只需将<code>db</code>变量导入到每个模型模块中。</p>
<h3>示例</h3>
<pre><code># apps.shared.models
from flask_sqlalchemy import SQLAlchemy
db = SQLAlchemy()
</code></pre>
<p/>
<pre><code># apps.members.models
from apps.shared.models import db
class Member(db.Model):
# TODO: Implement this.
pass
</code></pre>
<p/>
<pre><code># apps.reporting.members
from flask import render_template
from apps.members.models import Member
def report_on_members():
# TODO: Actually use arguments
members = Member.filter(1==1).all()
return render_template("report.html", members=members)
</code></pre>
<p/>
<pre><code># apps.reporting.routes
from flask import Blueprint
from apps.reporting.members import report_on_members
reporting = Blueprint("reporting", __name__)
reporting.route("/member-report", methods=["GET","POST"])(report_on_members)
</code></pre>
<p/>
<pre><code># apps.application
from flask import Flask
from apps.shared import db
from apps.reporting.routes import reporting
app = Flask(__name__)
db.init_app(app)
app.register_blueprint(reporting)
</code></pre>
<p><sub><strong>注意:</strong>这是这给你带来的一些力量的草图,显然你可以做更多的事情来让开发变得更容易(使用<code>create_app</code>模式,在某些文件夹中自动注册蓝图等)</sub></p>