Default binder can use UnmarshalParams(params []string) error inter…

[aldas]

Default binder can use UnmarshalParams(params []string) error interface to bind multiple input values at one go.

Relates to #2602

This allows developers to build fancy unmarsallers like related PR had. that turns /?a=1,2,3&a=4,5,6 into IntArrayB([]int{1, 2, 3, 4, 5, 6})

type IntArrayB []int func (i *IntArrayB) UnmarshalParams(params []string) error { var numbers = make([]int, 0, len(params)) for _, param := range params { var values = strings.Split(param, ",") for _, v := range values { n, err := strconv.ParseInt(v, 10, 64) if err != nil { return fmt.Errorf("'%s' is not an integer", v)	} numbers = append(numbers, int(n))	}	} *i = append(*i, numbers...) return nil } func TestBindUnmarshalParams(t *testing.T) { t.Run("ok, target is an alias to slice and is nil, append multiple inputs", func(t *testing.T) { e := New() req := httptest.NewRequest(http.MethodGet, "/?a=1,2,3&a=4,5,6", nil) rec := httptest.NewRecorder() c := e.NewContext(req, rec) result := struct { V IntArrayB `query:"a"`	}{} err := c.Bind(&result) assert.NoError(t, err) assert.Equal(t, IntArrayB([]int{1, 2, 3, 4, 5, 6}), result.V)	}) }

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.02%. Comparing base (a3b0ba2) to head (bdd4ac3).

Additional details and impacted files

@@ Coverage Diff @@ ## master #2607 +/- ## ========================================== - Coverage 93.20% 93.02% -0.18%  ========================================== Files 41 41 Lines 4693 4702 +9 ========================================== Hits 4374 4374 - Misses 230 236 +6  - Partials 89 92 +3 

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.