In a phoenix / elixir project: What is a good place to put helper functions. For example: I use Timex to deal with dates but I have to do some transformations on the returned struct to use it with my DB driver (one uses the key :min, the other :minute, etc). I don't want to repeat this piece of code in every model and would write a simple function that does that. What would be a good place to put this? Just in a module within the /lib folder? Are there any guidelines on how to organize this?
The main difference between lib and web for Phoenix before 1.2 is the reloading behaviour. For changes under lib to take effect you need to restart your server. So I tend to put most stuff under web to make development easier. Maybe web/helpers...
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But importing the whole model into somewhere else does not sound as a good idea. If you need to have a bundle of functions to be available in the set of other modules, the most common approach would be to declare a helpers module as:
If, on the other hand, you just want to have helpers declared in some dedicated place and different modules are supposed to need different functions, use Kernel.SpecialForms.import/2 with explicit only parameter to prevent name clash:
Working on a prototype using phoenix 1.7-rc and ash_authentication_phoenix, and getting the following error:
function MyAppWeb.Router.Helpers.auth_path/2 is undefined (module MyAppWeb.Router.Helpers is not available)
We have a new feature. This feature replaces the Helpers module generated in your Phoenix router, but helpers will continue to work and be generated (when you create an Phoenix 1.7 app). You can disable router helpers by passing the helpers: false option to use Phoenix.Router.
This feature replaces the Helpers module generated in your Phoenix router. For new applications helpers are not generated by default. You can enable router helpers by passing the helpers: true option to use Phoenix.Router.
Verified routes also support the Phoenix.Param protocol, but we don't need to concern ourselves with elixir protocols just yet. Just know that once we start building our application with structs like %User{} and %Post{}, we'll be able to interpolate those data structures directly into our ~p paths and phoenix will pluck out the correct fields to use in the route.
Phoenix generates a module Helpers inside your router by default, which containsnamed helpers to help developers generate and keep their routes up to date.Helpers can be disabled by passing helpers: false to use Phoenix.Router.
The URL generated in the named URL helpers is based on the configuration for:url, :http and :https. However, if for some reason you need to manuallycontrol the URL generation, the url helpers also allow you to pass in a URIstruct:
Remember that you can create shared Views. Alternatively, if yourhelpers are used across multiple views and are generic, you can create a plainmodule that encapsulates your HTML helpers. I usually call mine ComponentViewand use it inside any of my templates, for example:Component.primary_button("My Link", to: "yadayada").
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Myasthenia gravis (MG) is a chronic humoral immunity-mediated autoimmune disorder of the neuromuscular junction characterized by muscle weakness. Follicular helper T (Tfh) cells may be the key Th cell subset that promotes MG development, as their major function is helping B cell activation and Ab production. Aberrance of thymus-derived Tfh cells might be implicated in autoimmune diseases including MG; just how circulating Tfh cells, especially those from patients with a normal thymus, contribute to MG pathogenesis remains to be uncovered. In this article, we characterize a population of circulating CD4(+)CXCR5(+)PD-1(+) Tfh cells in ocular and generalized MG patients without thymic abnormalities and demonstrate that the circulating Tfh cells are significantly enriched in generalized MG patients but not in ocular MG patients compared with healthy subjects, whereas a proportion of follicular regulatory T cells decreased in MG patients. In addition, the frequency of plasma cells and B cells was higher and the serum levels of IL-6/IL-21 were also elevated in these MG patients. The activated Tfh1 and Tfh17 in Tfh cells are the major source for IL-21 production in MG patients. A strong correlation between Tfh cells and the plasma cell frequency and anti-acetylcholine receptor Ab titers was evident in generalized MG patients. In particular, we found that Tfh cells derived from MG patients promoted B cells to produce Abs in an IL-21 signaling-dependent manner. Collectively, our results suggest that circulating Tfh cells may act on autoreactive B cells and thus contribute to the development of MG in patients without thymic abnormalities.
This time, we're making even more customized Phoenix form input helpers. Like before they'll allow editing a collection of entries, but instead of array types directly in a user's schema, they'll be fields from a has_many associated schema. We'll work through a variety of potential pitfalls and create a very unorthodox input helper. e24fc04721