Now that I have the brewlog up and running, I wanted to do more than just make a list of brews. I thought it would be cool to some summarization; total amount of different ingredients used, different styles, and so on.
I wanted to do this within Jekyll without using additional programs or scripts, and I wanted it utilize the data already available in the posts themselves, instead of creating yet another dataset.
Data
Each post in the brew log has the recipe and brew information defined within the front matter of the post, in YAML.
---
layout: post
title: "Taylor's CaraLager"
brew_type: beer
recipe:
type: "All Grain"
size: "5.25 gallon"
style: "2B - International Amber Lager"
fermentables:
- name: "2-Row (US)"
amount: "8 lbs 12 oz"
perc: 89.2%
- name: "Crystal 80L"
amount: "5 oz"
perc: 3.2%
- name: "Munich 20L"
amount: "5 oz"
perc: 3.2%
...
---
I originally did this so that the data was accessible from Liquid; I have an include that displays the recipe in a standard format on all posts, and updates to that format only happen in a single file.
It turns out that I can also use it to summarize the posts, too.
Jekyll Liquid Filters
Jekyll already provides some additional Liquid filters that make this task pretty easy, namely where_exp and group_by_exp.
Creating a style summary page is actually pretty simple.
First, I group the pages up by style, but only posts for 'beer' (later I plan on separating mead and wine out into their own lists):
{% assign beer_styles = site.posts | where_exp: "item", "item.brew_type == 'beer'" | group_by_exp: "item", "item.recipe.style" %}
This:
- takes all of the posts in the site: site.posts
- filters it down to just 'beer' posts: | where_exp: "item", "item.brew_type == 'beer'"
- groups the remaining posts up by the style: | group_by_exp: "item", "item.recipe.style"
- assigns it to beer_styles: assign beer_styles =
beer_styles is now an array of objects with two attributes:
- name - which is the name of the style (a value from post.recipe.style)
- items - all of the posts with that value of post.recipe.style
Now I can loop through each style, and create a list item for each:
{% for style in beer_styles %}
- {{ style.name }}
...
{% endraw %}{% endhighlight %}
And for each list item (style), group all of the brews by name:
{% highlight liquid %}{% raw %}
...
{%- assign beer_names = style.items | group_by_exp: "item", "item.title" -%}
{%- for name in beer_names %}
- {{ name.name }}
...
Then, for each brew, display the brew date and link to the post:
...
{%- for beer in name.items -%}
{%if forloop.first <> true %} | {% endif %}
[{{ beer.date | date: site.minima.date_format }}]({{ beer.url | relative_url }})
...
{% endraw %}{% endhighlight %}
The `{%raw%}{%if forloop.first <> true %} | {% endif %}{%endraw%}` part puts a `|` character between each post link. Finally, close up all of the for loops (whew!):
{% highlight liquid %}{% raw %}
{%- endfor %}
{%- endfor %}
{%- endfor %}
All together:
## Beer
{% assign beer_styles = site.posts | where_exp: "item", "item.brew_type == 'beer'" | group_by_exp: "item", "item.recipe.style" %}
{% for style in beer_styles %}
- {{ style.name }}
{%- assign beer_names = style.items | group_by_exp: "item", "item.title" -%}
{%- for name in beer_names %}
- {{ name.name }}
{%- for beer in name.items -%}
{%if forloop.first <> true %} | {% endif %}
[{{ beer.date | date: site.minima.date_format }}]({{ beer.url | relative_url }})
{%- endfor %}
{%- endfor %}
{%- endfor %}
A summary page in 14 lines and no custom extensions/scripts...not bad!
