Support Groups as Extras

• I have searched the issues of this repo and believe that this is not a duplicate.
• I have searched the documentation and believe that my question is not covered.

Feature Request

There seems to be a few places where this issue is mentioned, but I don’t see anything explicitly tracking it.

(Specifically @matthijskooijman’s comment (point 2) 1644#issuecomment-895848818)

The new groups functionality is very helpful when managing packages installed while developing a project, but seems to miss a pretty good use case - basically using groups in place of extras when installing this package in another environment.

Instead of having to do:

# myproject_1

[tool.poetry.dependencies]
package_1 = "^0.0.1"

[tool.poetry.group.group_a]
optional = true

# this lets someone else develop this project with optional deps
[tool.poetry.group.group_a.dependencies]
package_2 = {version = "^0.0.2", optional = true}
package_3 = {version = "^0.0.3", optional = true}

# need to explicitly define "extras" for other packages install optional deps
[tool.poetry.extras]
group_a = ["package_2", "package_3"]

It would be cleaner (and make more sense I think, once groups is out of preview), if we could just do:

# myproject_1

[tool.poetry.dependencies]
package_1 = "^0.0.1"

[tool.poetry.group.group_a]
optional = true

[tool.poetry.group.group_a.dependencies]
package_2 = "^0.0.2"
package_3 = "^0.0.3"

# didn't need to explicitly define "extras", or individual packages as "optional"

And then in myproject_2:

# myproject_2

[tool.poetry.dependencies]
myproject_1 = {version = "^1.0.0", extras = ["group_a"]}

[rino0601]

Let say I want to pip install myproject_1[group_a] For now, it seems I have to write it this way:

# myproject_1
[tool.poetry.dependencies]
package_1 = "^0.0.1"

# annoying repetition 1
package_2 = {version = "^0.0.2", optional = true}
package_3 = {version = "^0.0.3", optional = true}

[tool.poetry.group.group_a]
optional = true

[tool.poetry.group.group_a.dependencies]
package_2 = "^0.0.2"
package_3 = "^0.0.3"

# need to explicitly define "extras" for other packages install optional deps
[tool.poetry.extras]
group_a = ["package_2", "package_3"] # annoying repetition 2

It would be nice if I could write it concisely like:

# myproject_1
[tool.poetry.dependencies]
package_1 = "^0.0.1"

[tool.poetry.group.group_a]
optional = true
extra = true    # just 1 flag to avoid repetition
[tool.poetry.group.group_a.dependencies]
package_2 = "^0.0.2"
package_3 = "^0.0.3"

There will be many cases in which you want to verify dependencies expressed in extras during development, so in many cases extras will soon become groups. Therefore, it would be very useful if we could express it as above.

[neersighted]

Optional dependencies outside the main group are meaningless in terms of extras. Move it to main and things will work as you expect.