如何在不使用文件的情况下以编程方式将模板文本传递到视图？

Question

我正在编写一些测试，我需要在视图中使用模板而不使用文件（例如，通过ViewPageTemplateFile）。模板必须计算tal表达式并访问视图的函数。这是我目前的问题。我在计算PageTemplate中的view时出错。我不确定我的代码是否遵循最佳实践。在

from plone.app.testing import TEST_USER_NAME, TEST_USER_PASSWORD
from plone.testing.z2 import Browser
from zope.component import getGlobalSiteManager
from zope.publisher.interfaces.browser import IBrowserView
from Products.Five.browser import BrowserView
from zope.pagetemplate.pagetemplate import PageTemplate

class MyView(BrowserView):
    def __init__(self, context, request):
        self.context = context
        self.request = request
    def render(self):
        template = PageTemplate()
        text = '''\
<div tal:on-error="string:view fails"><span tal:replace="view/var"/></div>
<div tal:on-error="string:python fails"><span tal:replace="python:'python works'"/></div>
            '''
        template.write(text)
        return template()
    def __call__(self):
        return self.render()
    def var(self):
        return 'my_value'

global_site_manager = getGlobalSiteManager()
global_site_manager.registerAdapter(MyView, (None, None), IBrowserView, 'my_view')

browser=Browser(app.Plone)
browser.addHeader('Authorization',
                  'Basic %s:%s' % (TEST_USER_NAME, TEST_USER_PASSWORD))
browser.open(app.Plone.absolute_url() + '/@@my_view')
print browser.contents

产生以下输出：

^{pr2}$

Answer 1

到目前为止，我的解决方法是创建我自己的class MyPageTemplate(PageTemplate)，在构造函数中将视图的实例作为参数传递，并重写pt_getContext，用实例中的view、context和{}填充命名空间。在

我想知道是否有更好的解决办法（最佳做法）。在

这里是我的解决方法：

from plone.app.testing import TEST_USER_NAME
from plone.app.testing import TEST_USER_PASSWORD
from plone.testing.z2 import Browser
from zope.component import getGlobalSiteManager
from zope.publisher.interfaces.browser import IBrowserView
from Products.Five.browser import BrowserView
from Products.Five.browser.pagetemplatefile import ViewPageTemplateFile
from zope.pagetemplate.pagetemplate import PageTemplate
from zope.interface import Interface
from zope.publisher.browser import IDefaultBrowserLayer

class MyPageTemplate(PageTemplate):
    instance = None
    def __init__(self, instance):
        self.instance = instance
    def pt_getContext(self, instance, request, **kw):
        namespace = super(MyPageTemplate, self).pt_getContext(**kw)
        namespace['view'] = self.instance
        namespace['context'] = self.instance.context
        namespace['request'] = self.instance.request
        return namespace

class MyView(BrowserView):
    def __init__(self, context, request):
        self.context = context
        self.request = request
    def render(self):
        template = MyPageTemplate(self)
        text = '''\
<div tal:on-error="string:request fails">request<span tal:replace="structure request"/> works</div>
<div tal:on-error="string:context fails">context/id=<span tal:replace="context/id"/> works</div>
<div tal:on-error="string:view fails">view/my_var=<span tal:replace="view/my_var"/> works</div>
<div tal:on-error="string:python fails"><span tal:replace="python:'python works'"/></div>
            '''
        template.write(text)
        return template()
    def __call__(self):
        return self.render()
    def my_var(self):
        return 'my_value'

global_site_manager = getGlobalSiteManager()
global_site_manager.registerAdapter(MyView, (None, None), IBrowserView, 'my_view')

browser=Browser(app.Plone)
browser.addHeader('Authorization', 'Basic %s:%s' % (TEST_USER_NAME, TEST_USER_PASSWORD))
browser.open(app.Plone.absolute_url() + '/@@my_view')
print browser.contents