go - Group slice by subarray values in Golang -
i have array of subarrays in following format
array ( [0] => array ( [unit_id] => 6504 [assignment_name] => grade assignment [assignment_description] => [assignment_total_score] => 10 [unit_type_name] => homework [is_graded] => 1 [standard_id] => 1219 [scoring_type] => score [attempt_score] => 8 [unit_duedate] => 2016-02-10 09:00:00 [standard] => array ( [0] => stdclass object ( [unit_id] => 6504 [is_formal] => 1 [assignment_name] => grade assignment [assignment_description] => [standard_id] => 1220 [standard_name] => 9-10.rl.3 [standard_description] => analyze how complex characters (e.g., multiple or conflicting motivations) develop on course of ) ) ) [1] => array ( [unit_id] => 8584 [assignment_name] => sine , cosecant graphs [assignment_description] => define sine , cosecant graphs using unit circle [assignment_total_score] => 15 [unit_type_name] => paper [scoring_type] => score [attempt_score] => 0 [unit_duedate] => 2016-04-29 09:00:00 [standard] => array ( [0] => stdclass object ( [unit_id] => 8584 [is_formal] => 1 [assignment_name] => sine , cosecant graphs [assignment_description] => define sine , cosecant graphs using unit circle [assignment_total_score] => 15 [standard_id] => 82790 [standard_name] => 9-10.rl.7 ) ) [2] => array ( [unit_id] => 11611 [assignment_name] => adding 5 + 3 + 6 [assignment_description] => [assignment_total_score] => 10 [unit_type_name] => homework [standard_id] => 82772 [scoring_type] => score [attempt_score] => 0 [unit_duedate] => 2016-08-23 19:00:00 [standard] => array ( [0] => stdclass object ( [unit_id] => 11611 [is_formal] => 1 [assignment_name] => adding 5 + 3 + 6 [assignment_description] => [assignment_total_score] => 10 [standard_id] => 82772 [standard_name] => 9-10.rl.1 ) ) ) ) and group new slice based on unit_type_name field in each subarray.
how can group slice unit_type_name? there native go functions available this? if loop above duplicate one, how can avoid that?
i not think golang has build-in functionality (i may wrong). assuption php array converted json object. managed code below sort array (in json format) based on unit_type_name created 2 structs have json values similar array keys be
//standardtype ... type standardtype struct { unitid int `json:"unit_id"` isformal int `json:"is_formal"` assignmentname string `json:"assignment_name"` assignmentdescription string `json:"assignment_description"` standardid int `json:"standard_id"` standardname string `json:"standard_name"` standarddescription string `json:"standard_description"` } //autogenerated ... type autogenerated struct { unitid int `json:"unit_id"` assignmentname string `json:"assignment_name"` assignmentdescription string `json:"assignment_description"` assignmenttotalscore int `json:"assignment_total_score"` unittypename string `json:"unit_type_name"` isgraded int `json:"is_graded"` standardid int `json:"standard_id"` scoringtype string `json:"scoring_type"` attemptscore int `json:"attempt_score"` unitduedate string `json:"unit_duedate"` standard []standardtype `json:"standard"` } var jsondata = `` func main() { m := []autogenerated{} err := json.unmarshal([]byte(jsondata), &m) if err != nil { panic(err) } i created map hold unit_type_name keys
slicekeys := make(map[string]string) i created map hold arrays have similar unit_type_name keys in autogenerated array
groupedslices := make(map[string][]autogenerated) then loop through decoded json string searching unit_type_name
:= range m { if unit_type_name exists in key slice add array item group slice
if _, ok := slicekeys[m[i].unittypename]; ok { autogenerated := groupedslices[m[i].unittypename] autogenerated = append(autogenerated, m[i]) groupedslices[m[i].unittypename] = autogenerated } else { else create new array key , add item it
slicekeys[m[i].unittypename] = m[i].unittypename autogenerated := []autogenerated{} autogenerated = append(autogenerated, m[i]) groupedslices[m[i].unittypename] = autogenerated } } fmt.println(slicekeys) fmt.println(groupedslices) } input:
[{"unit_id": 6504,"assignment_name": "grade assignment","assignment_description": "","assignment_total_score": 10,"unit_type_name": "homework","is_graded": 1,"standard_id": 1219, "scoring_type": "score","attempt_score": 8,"unit_duedate": "2016-02-10 09:00:00", "standard": [{"unit_id": 6504,"is_formal": 1,"assignment_name": "grade assignment","assignment_description": "", "standard_id": 1220,"standard_name": "9-10.rl.3","standard_description": "analyze how complex characters (e.g., multiple or conflicting motivations) develop on course of " }]},{"unit_id": 6504,"assignment_name": "grade assignment","assignment_description": "","assignment_total_score": 10, "unit_type_name": "paper","is_graded": 1,"standard_id": 1219,"scoring_type": "score","attempt_score": 8,"unit_duedate": "2016-02-10 09:00:00","standard": [{"unit_id": 6504,"is_formal": 1,"assignment_name": "grade assignment","assignment_description": "","standard_id": 1220,"standard_name": "9-10.rl.3","standard_description": "analyze how complex characters (e.g., multiple or conflicting motivations) develop on course of "}]},{ "unit_id": 6504,"assignment_name": "grade assignment","assignment_description": "", "assignment_total_score": 10,"unit_type_name": "aything else","is_graded": 1,"standard_id": 1219, "scoring_type": "score","attempt_score": 8,"unit_duedate": "2016-02-10 09:00:00","standard": [{ "unit_id": 6504,"is_formal": 1,"assignment_name": "grade assignment","assignment_description": "","standard_id": 1220, "standard_name": "9-10.rl.3","standard_description": "analyze how complex characters (e.g., multiple or conflicting motivations) develop on course of "}]}] output:
map[homework:homework paper:paper aything else:aything else] map[ homework:[ {6504 grade assignment 10 homework 1 1219 score 8 2016-02-10 09:00:00 [{6504 1 grade assignment 1220 9-10.rl.3 analyze how complex characters (e.g., multiple or conflicting motivations) develop on course of }]} ] paper:[ {6504 grade assignment 10 paper 1 1219 score 8 2016-02-10 09:00:00 [{6504 1 grade assignment 1220 9-10.rl.3 analyze how complex characters (e.g., multiple or conflicting motivations) develop on course of }]} ] aything else:[ {6504 grade assignment 10 aything else 1 1219 score 8 2016-02-10 09:00:00 [{6504 1 grade assignment 1220 9-10.rl.3 analyze how complex characters (e.g., multiple or conflicting motivations) develop on course of }]}] ]
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