从Jinja表达式中调用的函数中的字典访问值 [英] Access values from a dict in a function called in a Jinja expression

问题描述

我正在将字典从烧瓶视图传递给Jinja模板.我可以在dict中呈现值，但是如果我尝试将它们传递给url_for，则会得到UndefinedError: 'dict object' has no attribute 'eId'.为什么第一次访问成功后第二次访问失败?

I'm passing a dict from a Flask view to a Jinja template. I can render the values in the dict, but if I try to pass them to url_for I get UndefinedError: 'dict object' has no attribute 'eId'. Why did the second access fail when the first succeeded?

@app.route('/')
def show_entries():
    if session.get('logged_in'):
        cur = g.db.execute('select title, text, id from entries1 WHERE userid = ? OR public = 1 order by id desc', [userInfo['userid']])
    else:
        cur = g.db.execute('select title, text, id from entries1 WHERE public = 1 order by id desc')
    entries = [dict(title=row[0], text=row[1], eId=row[2]) for row in cur.fetchall()]
    return render_template('show_entries.html', entries=entries)

{% for entry in entries %}
    This works: {{ entry.eId }}
    This errors: {{ url_for('delete_entry', btnId=entry.eId) }}
{% endfor %}

推荐答案

您的entry是字典.虽然Jinja的表达式语法允许您对字典使用属性语法(dict.attr)，但是一旦将参数传递给具有Python语法的函数，则需要使用Python的常规字典访问语法dict['attr'].

Your entry is a dictionary. While Jinja's expression syntax allows you to use attribute syntax (dict.attr) for dictionaries, as soon as you're passing an argument to a function with Python syntax you need to use Python's normal dictionary access syntax, dict['attr'].

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