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// From the browser
var experimentCookie = prismic.startExperiment ? prismic.utils.docCookies.getItem('io.prismic.experiment') : null;
var experimentRef = experimentCookie ? api.experiments.refFromCookie(experimentCookie) : null;
var ref = experimentRef || api.data.master.ref;

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<script>
  // This is necessary for the edit button
  window.prismic = {
    endpoint: 'https://lesbonneschoses.prismic.io/api' // replace by your repository's endpoint
  };
</script>
<script type="text/javascript" src="//static.cdn.prismic.io/prismic.min.js"></script>

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// Example ref selection for NodeJS with ExpressJS
var ref = req.cookies[Prismic.previewCookie] || Api.master(),

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// Example preview endpoint for NodeJS with ExpressJS 
exports.preview = exports.route(function(req, res, ctx) {
  var previewToken = req.query['token'];
  ctx.api.previewSession(previewToken, ctx.linkResolver, '/', function(err, redirectUrl) {
    res.cookie(Prismic.previewCookie, previewToken, { maxAge: 60 * 30, path: '/', httpOnly: false });
    res.redirect(redirectUrl);
  });
})

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t

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// Using Play Scala
val ref = queryRef orElse {
  request.cookies.get(Experiment.cookieName) map (_.value) flatMap api.experiments.refFromCookie
} getOrElse api.master.ref

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<!-- Prismic experiments, goes right after your Google Analytics script -->
<!-- Replace {googleId} by the GoogleId of the current experiment, using your template language -->
<script src="//www.google-analytics.com/cx/api.js?experiment={googleId}"></script>
<script src="//static.cdn.prismic.io/prismic.js"></script>
<script>prismic.startExperiment("{googleId}", cxApi);</script>
<!-- End of Prismic experiments -->

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// Accessing image fields
fragments.Image.View imageView = doc.GetImageView("product.image", "main");
String url = imageView.Url;

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# Accessing image fields
image = doc.get_image('product.image')
# By default the 'main' view is returned
url = image.url

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# Accessing image fields
image = doc.get_image('product.image')
# Most of the time you will be using the "main" view
url = image.main.url