Comments (3)
I experimented with dependencies and found out that I didn’t have a very good idea of how they worked in Julia. There is much to discuss.
First of all, if Dash
has dependency DashHtmlComponents
, this does not mean that the user will be able to do using DashHtmlComponents
after Pkg.add("Dash")
, as we probably expected. The user still needs to do Pkg.add("DashHtmlComponents")
. This dependency means that the version that fits Dash
will be added by default to current environment at Pkg.add("DashHtmlComponents")
. If the user tries to install an incompatible version, he will get an error. On the other hand, if DashHtmlComponents
are already added to the current environment and the user tries to add Dash
whose dependencies these components do not satisfy, he will also get an error. (edited)
It works, as I understand it, in the following way. Julia can store multiple versions of packages at the system level, and each environment has a Manifest.tom
l file that specifies which version of the package is used in this environment.
Pkg.add
adds the package to the namespace. Checks its dependencies with other dependencies in the current environment and writes versions for all dependencies to the manifest, or returns an error if there is an unresolved version conflict. The dependencies themselves are not added to the namespace.
Therefore, 2 solutions seem to be suitable for solving our problem.
- Include the component code itself in the package as submodules and export them to an external namespace
- Add a DashBase package, reverse dependencies, and leave the components as separate packages, but again export them from Dash to an external namespace, something like:
using DashHtmlComponents
export .DasHtmlComponents
in Dash.jl file
In both cases, the user can include components using one of the following methods:
using Dash.DashHtmlComponents
or
using Dash
using .DashHtmlComponents
from dash.jl.
I would suggest looking into the Artifact system. It would restrict your compatibility to Julia 1.3+, but it should solve this problem even though your package isn't registered in JuliaRegistries/General.
As a basic overview of Artifacts, you can define the artifact name, git-tree-sha1
(for the right version) and download URL. It is intended to be used for non-Julia resources like your DashCoreComponents. Here is an example from Timezones.jl, which downloads a lot of artifacts. This also should make your project absolute path independent, which would make apps including dashboards easier to ship.
from dash.jl.
@waralex has successfully addressed this following his work on creating and loading DashBase.jl
, so I believe that I may close this one as resolved.
from dash.jl.
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