FIX: fixes for microdata schema rendering

[arpitjalan]

d9ca6c3#r135940042

[discoursebot]

This pull request has been mentioned on Discourse Meta. There might be relevant details there:

https://meta.discourse.org/t/missing-field-url-discussion-forum-schema/287347/19

[discoursebot]

This pull request has been mentioned on Discourse Meta. There might be relevant details there:

https://meta.discourse.org/t/different-schema-type-for-topics-and-posts/71471/24

[rr-it]

@CvX Please use href in link-tags instead of content:
<link itemprop='url' content='<%= @topic_view.absolute_url %>'>
<link itemprop='url' href='<%= @topic_view.absolute_url %>'>

E.g. the same code is already in use here:

discourse/app/views/topics/show.html.erb

Lines 72 to 74 in 7d0e0c3

	<% if post.image_url %>
	<link itemprop="image" href="<%= post.image_url %>">
	<% end %>

discourse/app/views/topics/show.html.erb

Lines 69 to 71 in 7d0e0c3

	<link <%= post.is_first_post? ? "itemprop='mainEntityOfPage'" : "" %> href="<%= post.topic.url %>">

discourse/app/views/topics/show.html.erb

Lines 139 to 144 in 7d0e0c3

	<% if @topic_view.prev_page %>
	<link rel="prev" href="<%= @topic_view.prev_page_path -%>">
	<% end %>
	<% if @topic_view.next_page %>
	<link rel="next" href="<%= @topic_view.next_page_path -%>">
	<% end %>

[arpitjalan]

Thanks for the catch @rr-it! I have made the suggested change. 👍🏼