Gin A new method for parsing form data array type fields

• go version: 1.9
• gin version (or commit ref): master branch
• operating system:

Description

this image is my http post params . I'm going to use c.GetPostFormMap to parse processes field, but I didn't get the expected results. So I wrote a solution myself, as follows：

// GetPostFormArrayMap returns a map for a given form key, plus a boolean value
// whether at least one value exists for the given key.
func (c *Context) GetPostFormArrayMap(key string) ([]map[string]string, bool) {
    req := c.Request
    req.ParseForm()
    req.ParseMultipartForm(c.engine.MaxMultipartMemory)
    dicts, exist := c.getArrayMap(req.PostForm, key)
    if !exist && req.MultipartForm != nil && req.MultipartForm.File != nil {
        dicts, exist = c.getArrayMap(req.MultipartForm.Value, key)
    }
    return dicts, exist
}

// get is an internal method and returns a map which satisfy conditions.
func (c *Context) getArrayMap(m map[string][]string, key string) ([]map[string]string, bool) {
    dicts := make(map[string]map[string]string)
    exist := false
    for k, v := range m {
        if i := strings.IndexByte(k, '['); i >= 1 && k[0:i] == key { // 确定name[1]key
            num := ``
            if j := strings.IndexByte(k[i+1:], ']'); j >= 1 {
                num = k[i+1:][:j]
            }
            if j := strings.IndexByte(k[i+1:], '['); j >= 1 {
                exist = true
                field := k[i+1:][j+1 : len(k[i+1:])-1]
                if dict, ok := dicts[num]; ok {
                    dict[field] = v[0]
                    dicts[num] = dict
                } else {
                    dicts[num] = map[string]string{field: v[0]}
                }
            }
        }
    }
    arr := make([]map[string]string, 0)
    for _, value := range dicts {
        arr = append(arr, value)
    }
    return arr, exist
}

this image is my parse result .

Screenshots

Comment From: rafimuhammad01

hi @thinkerou @farmerx I created pull request for implementing this feature and also the unit test. Please review it. Thank you! :beer: