359
93%
master: 87%

Ran 01 Jun 2017 11:58PM UTC

Jobs 2

Files 1

Run time 15s

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Build # 359

Build Type

push

travis-ci

Committed by

web-flow

Commit Message

dig.Param: Recurse into nested parameter objects (#73)

This change adds support to parameter objects for recursing into fields that
are also parameter objects. That is, this change allows the following,

    type OutputConfig struct {
        dig.Param

        Writer io.Writer
    }

    type Config struct {
        dig.Param

        Input io.Reader
        Output OutputConfig
    }

    func NewTransport(cfg Config) (*Transport, error) { .. }

Besides the usefulness of treating fields similar to constructor parameters,
there's another motivating use case for this: Aliasing `dig.Param`. Without
this change, we have special handling for the `dig.Param` type, opting it out
of resolution from `dig`. If a library author wants to use their own type in
place of `dig.Param` (for example, `fx.Param`), they can't quite do this
because any alias of `dig.Param` is a different type; one which the library
does not special-case.

    package fx

    type Param dig.Param

    type Config struct {
        Param

        Input io.Reader
    }

    // The above with fail because dig doesn't know how to resolve fx.Param.

With this change, Fx will be able to support the following.

    package fx

    type Param struct{ dig.Param }

    type Config struct {
        Param

        // ..
    }

Coverage Stats

197 of 213 relevant lines covered (92.49%)

47.15 hits per line

Coverage Regressions

Lines	Coverage	∆	File
11	100.0		dig.go

Jobs

ID	Job ID	Ran	Files	Coverage
1	359.1	01 Jun 2017 11:58PM UTC	0	92.49	Travis Job 359.1
2	359.2	01 Jun 2017 11:58PM UTC	0	92.49	Travis Job 359.2

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