This commit introduces a where_exp filter, which can be used as follows:
`{{ array | where_exp: "item", "item == 10" }}`
`{{ array | where_exp: "item", "item.field > 10" }}`
`{{ site.posts | where_exp: "post", "post contains 'field'" }}`
`{{ site.posts | where_exp: "post", "post.array contains 'giraffes'" }}`
This permits a variety of use cases, such as reported in: jekyll#4467,
jekyll#4385, jekyll#2787.
Just because developer are lazy and tools like this is for move forward faster, normally we don't read (it's a fact) and because of that I missed this super important sentence. At least this should help.
After running:
sudo dnf install ruby ruby-devel rubygems nodejs
sudo dnf group install "C Development and Tools"
I was unable to install Jekyll via `gem` due to an error:
The compiler failed to generate an executable file. (RuntimeError) You have to install development tools first.
Taken from the [fedoraproject.org](https://developer.fedoraproject.org/tech/languages/ruby/gems-installation.html) Gem page:
>If you installed all the above, but the extensions would still not compile, you are probably running a Fedora image that misses `redhat-rpm-config` >package. In that case gcc compiler would complain about one of the following:
gcc: error: conftest.c: No such file or directory
gcc: error: /usr/lib/rpm/redhat/redhat-hardened-cc1: No such file or directory
>To solve this, simply run sudo dnf install `redhat-rpm-config`.
After doing so it downloaded, compiled and installed without a problem.
I followed the troubleshooting and came up with `sudo gem install jekyll` unable to generate the binary file because the development libraries were not installed on my system. Per [fedoraproject.org -- Gems](https://developer.fedoraproject.org/tech/languages/ruby/gems-installation.html) this is necessary to install this. The instructions mirror what is listed on that page, but using `yum` instead of `dnf` - which is understandable because RH and CentOS still use `yum`.
PR #2895 merged this in, but there isn't any documentation anywhere for this as far as I can find. All the Stack Overflow answers I could find said it was impossible to push and pop elements from a Liquid array, although that's probably because they were using Shopify's Liquid.
Fixes https://github.com/jekyll/jekyll/pull/4384
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