问题
I have this helper link
link_to "", product_path(product, anchor: "disqus_thread"), data: { "disqus-identifier" => "#{url_for([product, {only_path: false}])}" }, class: "no-underline bold grey-text text-darken-3 margin-left"
layout: application.rb
%script{id: "dsq-count-scr", src: "https://url.disqus.com/count.js", async: "async"}
_disqus.html.erb
<div class="col-lg-8 col-lg-offset-2 big-top-space margin-bottom">
<div id="disqus_thread"></div>
<script>
var disqus_shortname = 'yourname';
var disqus_identifier = '<%= url_for([product, {only_path: false}]) %>';
var disqus_title = '<%= product.name %>';
var disqus_url = '<%= url_for([product, {only_path: false}]) %>';
(function() { // DON'T EDIT BELOW THIS LINE
var d = document, s = d.createElement('script');
s.src = 'https://url.disqus.com/embed.js';
s.setAttribute('data-timestamp', +new Date());
(d.head || d.body).appendChild(s);
})();
</script>
<noscript>Please enable JavaScript to view the <a href="https://disqus.com/?ref_noscript">comments powered by Disqus.</a></noscript>
</div>
and all works fine I get a number, the number is the disqus comments counter of each post in my index view, but how show only the number if is greater than 0? if is equal to 0 I dont wanna show it in the view. Someone know how to resolve this problem? Thanks a lot
i tried with this:
add this column to products comment_count :integer
i changed my _disqus.html
<div class="col-lg-8 col-lg-offset-2 big-top-space margin-bottom">
<div id="disqus_thread"></div>
<script>
var disqus_shortname = 'yourname';
var disqus_identifier = '<%= url_for([product, {only_path: false}]) %>';
var disqus_title = '<%= product.name %>';
var disqus_url = '<%= url_for([product, {only_path: false}]) %>';
var disqus_config = function () {
this.callbacks.onNewComment = [
function() {
$.ajax({
method: "PATCH",
url: '<%= product_path(product) %>',
data: {increment: "comment_count"}
})
}
];
};
(function() { // DON'T EDIT BELOW THIS LINE
var d = document, s = d.createElement('script');
s.src = 'https://url.disqus.com/embed.js';
s.setAttribute('data-timestamp', +new Date());
(d.head || d.body).appendChild(s);
})();
</script>
<noscript>Please enable JavaScript to view the <a href="https://disqus.com/?ref_noscript">comments powered by Disqus.</a></noscript>
</div>
Product_controller
def update
product = Product.find(params[:id])
product.update(update_product)
end
def update_product
params.permit(:comment_count)
end
source: https://help.disqus.com/customer/portal/articles/466258-capturing-disqus-commenting-activity-via-callbacks
but i get this error
Started PATCH "/products/12" for ::1 at 2017-04-12 17:44:38 -0500
Processing by ProductsController#update as */*
Parameters: {"increment"=>"comment_count", "id"=>"12"}
ShoppingCart Load (0.0ms) SELECT "shopping_carts".* FROM "shopping_carts" WH
ERE "shopping_carts"."id" = ? LIMIT 1 [["id", 102]]
Product Load (0.0ms) SELECT "products".* FROM "products" WHERE "products"."i
d" = ? LIMIT 1 [["id", 12]]
CACHE (0.0ms) SELECT "products".* FROM "products" WHERE "products"."id" = ?
LIMIT 1 [["id", "12"]]
Unpermitted parameters: increment, id
(0.0ms) begin transaction
User Load (0.0ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT
1 [["id", 1]]
(0.0ms) commit transaction
Rendered products/update.haml within layouts/application (0.0ms)
(0.0ms) SELECT COUNT(*) FROM "products" INNER JOIN "in_shopping_carts" ON "p
roducts"."id" = "in_shopping_carts"."product_id" WHERE "in_shopping_carts"."shop
ping_cart_id" = ? [["shopping_cart_id", 102]]
Rendered partials/_unlogged.haml (15.5ms)
Rendered partials/_nav.haml (765.8ms)
Completed 200 OK in 3476ms (Views: 3448.8ms | ActiveRecord: 0.0ms)
Unpermitted parameters: increment, id
in console
comment_count: nil
someone can help me?
回答1:
The best way I can think to solve this is to:
- add a
comment_countattribute to your database - add a disqus
onNewCommentcallback to update the comment count on your record.
With Javascript you can add a callback:
var disqus_config = function () {
this.callbacks.onNewComment = [
function() {
alert(comment.id);
alert(comment.text);
$.ajax({
method: "PATCH",
url: "<%= product_path(product) %>",
data: {increment: "comment_count"}
})
}
];
};
then you would know the comment count going forward.
documentation: https://help.disqus.com/customer/portal/articles/466258-capturing-disqus-commenting-activity-via-callbacks
Change your Controller to:
def update
product = Product.find(params[:id])
if params[:comment_count]
product.increment!(:comment_count)
else
product.update(update_product)
end
end
回答2:
You can't - at least not in the way you attempting.
link_to "", product_path(product, anchor: "disqus_thread"), data: { "disqus-identifier" => "#{url_for([product, {only_path: false}])}" }, class: "no-underline bold grey-text text-darken-3 margin-left"
This is evaluated on your Rails server before the page is sent to the browser.
<script>
var disqus_shortname = 'yourname';
var disqus_identifier = '<%= url_for([product, {only_path: false}]) %>';
var disqus_title = '<%= product.name %>';
var disqus_url = '<%= url_for([product, {only_path: false}]) %>';
(function() { // DON'T EDIT BELOW THIS LINE
var d = document, s = d.createElement('script');
s.src = 'https://url.disqus.com/embed.js';
s.setAttribute('data-timestamp', +new Date());
(d.head || d.body).appendChild(s);
})();
</script>
This javascript is run later in the client (the users browser) - at that point the page is already sent by the server.
If you want to know when rendering on the server side if there are any comments you need to make a call to the Disqus API from the server.
来源：https://stackoverflow.com/questions/43358469/how-to-show-a-link-to-helper-only-if-it-returns-0