I'm building a django template to duplicate images based on an argument passed from the view; the template then uses Jinja2 in a for loop to duplicate the image.
BUT, I can only get this to work by passing a list I make in the view. If I try to use the jinja range, I get an error ("Could not parse the remainder: ...").
Reading this link, I swear I'm using the right syntax.
template
{% for i in range(variable) %}
<img src=...>
{% endfor %}
I checked the variable I was passing in; it's type int. Heck, I even tried to get rid of the variable (for testing) and tried using a hard-coded number:
{% for i in range(5) %}
<img src=...>
{% endfor %}
I get the following error:
Could not parse the remainder: '(5)' from 'range(5)'
If I pass to the template a list in the arguments dictionary (and use the list in place of the range statement), it works; the image is repeated however many times I want.
What am I missing? The docs on Jinja (for loop and range) and the previous link all tell me that this should work with range and a variable.
Soooo.... based on Franndy's comment that this isn't automatically supported by Django, and following their link, which leads to this link, I found how to write your own filter.
Inside views.py:
from django.template.defaulttags import register
#register.filter
def get_range(value):
return range(value)
Then, inside template:
{% for i in variable|get_range %}
<img src=...>
{% endfor %}
Related
I am looping through products and I need the cycle tag based on loop.
{% for product in collection.products %}
{% render 'product-grid-item', product: product %}
{% endfor %}
Inside the "product-grid-item", I have:
{% assign class_1 = 'small-6 medium-4' %}
{% assign class_2 = 'small-6 medium-3' %}
{% capture grid_item_width %}
{% cycle class_1, class_1, class_1, class_2, class_2, class_2, class_2 %}
{% endcapture %}
The cycle is not working, because it is not directly inside the "for loop". Any idea how to get this working?
I am aware of alternatives, I am just trying to make "cycle" work inside a render tag.
Render is a closed piece of code, it can't read what is happening outside of it.
So at the moment you not only don't have access to the cycle but you don't have access to the forloop object as well.
You are looking for how the include works but that is deprecated and you shouldn't use it.
So the short answer is you can't make it work, since the main logic of the render is to work this way.
The only way to make the render aware of something outside it is to pass a variable to it, so you need to make your cycle logic outside of it and pass the resulting variable inside of it.
What you are trying to do is possible as long as you rearrange your approach slightly. You will just need to do your math outside of the snippet and pass an appropriate value as a variable into the snippet.
{% assign class_array = 'class-1,class-1,class-1,class-2,class-2,class-2,class-2' | split: ',' %}
{% for product in collection.products %}
{% assign loop_position = forloop.index0 | modulo: class_array.size %}
{% render 'product-grid-item', product: product, class_name: class_array[loop_position] %}
{% endfor %}
How this works
Just like before, we make a comma-separated array of class names that we want to cycle through. (We cannot make an array directly, but we can turn a delimited string into an array pretty easily using the split filter) - but this time we assign that to a variable.
We then use the forloop index and the modulo operator to get a value between 0 and the last index position of our array list and use that number as the lookup value for our array. That value is passed into the rendered snippet so that product-grid-item can access it.
If we ever need to change our cycling class names, all we have to do is update the array with the new values. Even if the number of values changes in the future, the code will still work to cycle through all of the values provided.
Cheers!
I'm trying to filter an array of blocks using block settings. I can filter by properties like "type" using the following syntax:
{% assign example = section.blocks | where: "type", "photos" %}
What I need to do is filter by block settings, something like this:
{% assign example = section.blocks | where: settings.collection, collection.handle %}
The above example is failing silently.
A note: Currently I am accomplishing what I need using a capture with a for loop and an if statement, and then assigning with a split — but the code is so bloated, and doing all that for a simple filter operation seems ridiculous. I find myself constantly feeling like I'm fighting with liquid, and I guess I'm hoping it might be just a bit more elegant than I'm giving it credit for.
I don't know much about Ruby, but it seems you can't pass nested properties with dot notation to the where filter. However, after seeing people accessing nested values using map, I tested mixing the two, and the map filter seems to work well for this case.
I have a boolean setting called default in my blocks, and I got the settings object for the last block with default set to true using this:
{% assign obj = section.blocks | map: 'settings' | where: 'default' | last %}
Of course, then you can't get data outside of the settings object that was extracted. For that I think you really would need to loop through the section.blocks and find filter manually using the if tag.
You are doing it wrong. where will work only at the root element. In your case section.blocks is the root element so where can be used for something like section.blocks.abcd_property.
Rough example: {% assign example = section.blocks | where: 'collection', collection.handle %} will load all section blocks having their collection property as collection.handle value
This will work
{% if settings.collection == collection.handle %}
{% assign example = section.blocks %}
{% else %}
{% assign example = '' | split: '' %}
{% endif %}
Previously used map which loses outer data but found string notation works with where for nested properties:
E.g., Using a posts collection where each .md file has the front-matter:
header:
isArchived: true
The following liquid snippet filters archived posts via header.isArchived:
{% assign archived = site.posts | where: "header.isArchived", true %}
I am looping through all collections, and creating a preview item with each collection title, image and link. But I have 15 collections I would like to exclude.
Currently I am using 'contains' to exclude the 15 I don't want, but am wondering if theres a cleaner way to write this since its a really long if condition.
Thanks in advance!
Example below:
{% for collection in collections %}
{% if collection.title contains 'collection-1' or collection.title
contains 'collection-2' or collection.title contains 'collection-3'
or collection.title contains 'collection-4' or collection.title
contains 'collection-5' %}
{% else %}
// build item here
{% endif %}
{% endfor %}
I would create an array of exclusions and check to see if my exclusion array contains the collection in question. (And rather than the title, I would use the collection handle as the handle is guaranteed to only be 'clean' names and guaranteed to be unique)
Example:
{% assign collection_exclusion_array = 'collection-1, collection-2, collection-3, collection-4, collection-5' | remove: ' ' | split: ',' %}
{% for collection in collections %}
{% if collection_exclusion_array contains collection.handle %}
{% continue %}
{% endif %}
{% comment %} Build items here {% endcomment %}
{% endfor %}
How it works:
We cannot directly create arrays in Liquid - we can only make one by taking a string and using the split filter to create our array.
By using handles, we guarantee that our list values only contains letters, numbers and hyphens - there's no chance that our delimiter (in this case, the comma) can accidentally show up as part of the value.
We don't want spaces to be part of the array values, so we remove them before we use the split filter. We could instead just not put spaces between each value, but in my brain that reads like a terrible abuse of grammar. Either omitting spaces the first time or removing them after creating your string will work.
Now that we have our array of exclusions, when we loop through collections we can check to see if the current collection's handle shows up in the list.
If found, skip to the next collection using the continue statement - this saves a layer of indentation since we don't have to have an empty if followed by an else that contains everything that we want to do.
And there you go! Hope it helps :)
NB: For more information on handles in Shopify, see https://help.shopify.com/en/themes/liquid/basics/handle
An alternate method to achieve your exclusions:
If you give your collections some sort of flag that indicates that they shouldn't show up in your collection loop, you can manage each collection directly, rather than maintaining a separate list.
If we look at the collection page in your admin, though, we don't get a lot that's helpful: all we see are things like title, description, etc. Not even a place to give the collection a specific tag!
Fortunately, collections are able to have metafields - Shopify just has that feature hidden from normal users. Metafields allow you to create additional information for objects in your store (products, collections, pages, etc.), which you can then reference through Liquid.
You can read more about Shopify's use of metafields here: https://www.shopify.com/partners/blog/110057030-using-metafields-in-your-shopify-theme
My previous favourite plugin for accessing metafields was ShopifyFD, a browser extension that would let you view and edit that metadata right on your collection page, but unfortunately Shopify's recent changes to the admin have broken that plugin. The author is working on a new version, but it's not ready at the time of writing: https://freakdesign.com.au/blogs/news/shopifyfd-and-the-current-case-of-the-broken-tool
(Note: I haven't tried any of the other metafield-editing tools listed in the above linked article - when ShopifyFD started having trouble, I started doing my metafield editing using the admin API and creating/posting the requests myself: https://help.shopify.com/en/api/reference/metafield)
Once you have a way to easily set metafields (which, surprisingly, seems to be the hard part right now), your for-loop logic is extremely simple. Let's assume that the metafield you create for this purpose has the namespace 'preview' and the key 'exclude':
{% for collection in collections %}
{% if collection.metafields.preview.exclude %}
{% continue %}
{% endif %}
{% comment %} Do stuff! {% endcomment %}
{% endfor %}
This will now skip any collection that has any value set in your custom field, so if you change your mind about any current or future collection all that needs to change is the one metafield on the collection itself.
I thought this would be simple to solve but I am trying to put a variable within a liquid statement.
I have my variable {{ loop_index }} and I want it to be within this statement :
{% if settings.dropdown-[loop_index]-select %}
I tried putting [...] round it but that didn't work. Basically it should say settings.dropdown-1-select, settings.dropdown-2-select.
What am I doing wrong?
Create a string containing the variable name, then use the square bracket notation to access the setting with that name. For example:
{% capture var %}dropdown-{{ loop_index }}-select{% endcapture %}
{% if settings[var] %}
I am trying to render the dictionary content using Django template like this
for example : result contain dictionary X
X={a:1,
b:1,
c:X(dictionary X again)
}
This could be any many places and at multiple levels
template : results.html, says something like following
{{a}}
{{b}}
{% if X.a %}
{% include results.html %}
{% endif %}
I thought that this would work but I get error saying
maximum recursion depth exceeded while calling a Python object
How could I resolve this?
Thank you
get rid of the c:X part in your dictionary X, you can't do that.
You can use X or properties included in it twice in your template, so there's no need for nested self-references in your dictionary.