Exemplo n.º 1
0
//func Find(ms []toolkit.M, filters []*Filter) (output []int) {
func Find(ms interface{}, filters []*Filter) (output []int) {
	//-- is not a slice
	if !toolkit.IsSlice(ms) {
		toolkit.Println("Data is not slice")
		return []int{}
	}

	//toolkit.Printf("Find:%s Filter:%s\n", toolkit.JsonString(ms), toolkit.JsonString(filters))
	sliceLen := toolkit.SliceLen(ms)
	for i := 0; i < sliceLen; i++ {
		var v toolkit.M
		item := toolkit.SliceItem(ms, i)
		e := toolkit.Serde(item, &v, "json")
		if e == nil {
			match := MatchM(v, filters)
			if match {
				output = append(output, i)
			}
		} else {
			//toolkit.Println("Serde Fail: ", e.Error(), " Data: ", item)
		}
	}
	return
}
Exemplo n.º 2
0
func (q *Query) Exec(in toolkit.M) error {
	setting, e := q.prepare(in)
	commandType := setting["commandtype"].(string)
	//toolkit.Printf("Command type: %s\n", commandType)
	if e != nil {
		return err.Error(packageName, modQuery, "Exec: "+commandType, e.Error())
	}

	if setting.GetString("commandtype") == dbox.QueryPartSelect {
		return err.Error(packageName, modQuery, "Exec: "+commandType, "Exec is not working with select command, please use .Cursor instead")
	}

	q.Lock()
	defer q.Unlock()

	var dataM toolkit.M
	var dataMs []toolkit.M

	hasData := in.Has("data")
	dataIsSlice := false
	data := in.Get("data")
	if toolkit.IsSlice(data) {
		dataIsSlice = true
		e = toolkit.Unjson(toolkit.Jsonify(data), dataMs)
		if e != nil {
			return err.Error(packageName, modQuery, "Exec: "+commandType, "Data encoding error: "+e.Error())
		}
	} else {
		dataM, e = toolkit.ToM(data)
		dataMs = append(dataMs, dataM)
		if e != nil {
			return err.Error(packageName, modQuery, "Exec: "+commandType, "Data encoding error: "+e.Error())
		}
	}

	hasWhere := setting.Has("where")
	where := setting.Get("where", []*dbox.Filter{}).([]*dbox.Filter)
	if hasWhere && len(where) == 0 {
		inWhere := in.Get("where")
		if inWhere == nil {
			hasWhere = false
			where = nil
		} else {
			if !toolkit.IsSlice(inWhere) {
				where = append(where, inWhere.(*dbox.Filter))
			} else {
				where = inWhere.([]*dbox.Filter)
			}
		}
	}

	if hasData && hasWhere == false && toolkit.HasMember([]interface{}{dbox.QueryPartInsert, dbox.QueryPartDelete,
		dbox.QueryPartUpdate, dbox.QueryPartSave}, commandType) {
		hasWhere = true
		//toolkit.Println("check where")
		if toolkit.IsSlice(data) {
			ids := []interface{}{}
			idField := ""
			if idField == "" {
				return err.Error(packageName, modQuery, "Exec: "+commandType, "Data send is a slice, but its element has no ID")
			}
			dataCount := toolkit.SliceLen(data)
			for i := 0; i < dataCount; i++ {
				dataI := toolkit.SliceItem(data, i)
				if i == 0 {
					idField = toolkit.IdField(dataI)
				}
				ids = append(ids, toolkit.Id(dataI))
			}
			where = []*dbox.Filter{dbox.In(idField, ids)}
		} else {
			idfield := "_id"
			id := toolkit.Id(data)
			if !toolkit.IsNilOrEmpty(id) {
				where = []*dbox.Filter{dbox.Eq(idfield, id)}
			} else {
				where = nil
				hasWhere = false
			}
		}
	}
	/*
		toolkit.Printf("CommandType: %s HasData: %v HasWhere: %v Where: %s\n",
			commandType, hasData, hasWhere, toolkit.JsonString(where))
	*/
	e = q.openFile(commandType)
	//toolkit.Printf(commandType+" Open File, found record: %d\nData:%s\n", len(q.data), toolkit.JsonString(q.data))
	if e != nil {
		return err.Error(packageName, modQuery, "Exec: "+commandType, e.Error())
	}

	var indexes []interface{}
	if hasWhere && commandType != dbox.QueryPartInsert {
		whereIndex := dbox.Find(q.data, where)
		indexes = toolkit.ToInterfaceArray(&whereIndex)
		//toolkit.Printf("Where Index: %s Index:%s\n", toolkit.JsonString(whereIndex), toolkit.JsonString(indexes))
	}
	if commandType == dbox.QueryPartInsert {
		if !hasData {
			return err.Error(packageName, modQuery, "Exec: "+commandType, "Data is empty")
		}
		if !dataIsSlice {
			dataMs = []toolkit.M{dataM}
		}

		//-- validate
		for _, datam := range dataMs {
			idField, idValue := toolkit.IdInfo(datam)
			toolkit.Serde(dbox.Find(q.data, []*dbox.Filter{dbox.Eq(idField, idValue)}), &indexes, "")
			if len(indexes) > 0 {
				return err.Error(packageName, modQuery, "Exec: "+commandType, toolkit.Sprintf("Data %v already exist", idValue))
			}
		}

		//-- insert the data
		q.data = append(q.data, dataMs...)
	} else if commandType == dbox.QueryPartUpdate {

		//-- valida
		if !hasData {
			return err.Error(packageName, modQuery, "Exec: "+commandType, "Data is empty")
		}

		var dataUpdate toolkit.M
		var updateDataIndex int

		// if it is a slice then we need to update each data passed on its slice
		isDataSlice := toolkit.IsSlice(data)
		if isDataSlice == false {
			isDataSlice = false
			e = toolkit.Serde(data, &dataUpdate, "")
			if e != nil {
				return err.Error(packageName, modQuery, "Exec: "+commandType, "Serde data fail"+e.Error())
			}
		}

		var idField string
		//toolkit.Printf("Indexes: %s\n", toolkit.JsonString(indexes))

		for i, v := range q.data {
			// update only data that match given inde
			if toolkit.HasMember(indexes, i) || !hasWhere {
				if idField == "" {
					idField = toolkit.IdField(v)
					if idField == "" {
						return err.Error(packageName, modQuery, "Exec: "+commandType, "No ID")
					}
				}

				// If dataslice is sent, iterate f
				if isDataSlice {
					e = toolkit.Serde(toolkit.SliceItem(data, updateDataIndex), &dataUpdate, "")
					if e != nil {
						return err.Error(packageName, modQuery, "Exec: "+commandType, "Serde data fail "+e.Error())
					}
					updateDataIndex++
				}
				dataOrigin := q.data[i]
				toolkit.CopyM(&dataUpdate, &dataOrigin, false, []string{"_id"})
				toolkit.Serde(dataOrigin, &v, "")
				q.data[i] = v
			}
		}
	} else if commandType == dbox.QueryPartDelete {
		if hasWhere && len(where) > 0 {
			indexes := dbox.Find(q.data, where)
			if len(indexes) > 0 {
				newdata := []toolkit.M{}
				for index, v := range q.data {
					partOfIndex := toolkit.HasMember(indexes, index)
					if partOfIndex == false {
						newdata = append(newdata, v)
					}
					//toolkit.Println("i:", indexes, ", index:", index, ", p.ofIndex: ", partOfIndex, ", data: ", toolkit.JsonString(newdata))
				}
				q.data = newdata
			}
		} else {
			q.data = []toolkit.M{}
		}
		//toolkit.Printf("Data now: %s\n", toolkit.JsonString(q.data))
	} else if commandType == dbox.QueryPartSave {
		if !hasData {
			return err.Error(packageName, modQuery, "Exec: "+commandType, "Data is empty")
		}

		var dataMs []toolkit.M
		var dataM toolkit.M
		if !toolkit.IsSlice(data) {
			e = toolkit.Serde(&data, &dataM, "json")
			if e != nil {
				return err.Error(packageName, modQuery, "Exec: "+commandType+" Serde data fail", e.Error())
			}
			dataMs = append(dataMs, dataM)
		} else {
			e = toolkit.Serde(&data, &dataMs, "json")
			if e != nil {
				return err.Error(packageName, modQuery, "Exec: "+commandType+" Serde data fail", e.Error())
			}
		}
		//toolkit.Printf("Saving: %s\n", toolkit.JsonString(dataMs))

		for _, v := range dataMs {
			idField, idValue := toolkit.IdInfo(v)
			indexes := dbox.Find(q.data, []*dbox.Filter{dbox.Eq(idField, idValue)})
			if len(indexes) == 0 {
				q.data = append(q.data, v)
			} else {
				dataOrigin := q.data[indexes[0]]
				//toolkit.Printf("Copy data %s to %s\n", toolkit.JsonString(v), toolkit.JsonString(dataOrigin))
				toolkit.CopyM(&v, &dataOrigin, false, []string{idField})
				q.data[indexes[0]] = dataOrigin
			}
		}
	}
	e = q.writeFile()
	if e != nil {
		return err.Error(packageName, modQuery, "Exec: "+commandType+" Write fail", e.Error())
	}
	return nil
}
Exemplo n.º 3
0
func (s *SliceBase) Item(i int) interface{} {
	return toolkit.SliceItem(s.data, i)
}
Exemplo n.º 4
0
func (q *Query) Exec(parm toolkit.M) error {
	var (
		e                    error
		updatedValue, dataMs []toolkit.M
		dataM                toolkit.M
	)

	filters, e := q.Filters(parm)
	if e != nil {
		return errorlib.Error(packageName, modQuery, "Exec", e.Error())
	}

	if parm == nil {
		parm = toolkit.M{}
	}

	data := parm.Get("data", nil)
	filePath := q.Connection().(*Connection).filePath
	commandType := filters.Get("cmdType").(string)
	hasWhere := filters.Has("where")
	hasCmdType := toolkit.M{}
	hasData := parm.Has("data")
	getWhere := filters.Get("where", []*dbox.Filter{}).([]*dbox.Filter)
	dataIsSlice := toolkit.IsSlice(data)
	if dataIsSlice {
		e = toolkit.Unjson(toolkit.Jsonify(data), &dataMs)
		if e != nil {
			return errorlib.Error(packageName, modQuery, "Exec: "+commandType, "Data encoding error: "+e.Error())
		}
		for _, v := range dataMs {
			id := toolkit.Id(v)
			idF := toolkit.IdField(v)

			if toolkit.IsNilOrEmpty(id) {
				return errorlib.Error(packageName, modCursor+".Exec", commandType, "Unable to find ID in slice data")
			} else {
				getWhere = []*dbox.Filter{dbox.Eq(idF, id)}
			}
		}
	} else {
		dataM, e = toolkit.ToM(data)
		if e != nil {
			return errorlib.Error(packageName, modQuery, "Exec: "+commandType, "Unable to Map, error: "+e.Error())
		}

		id := toolkit.Id(dataM)
		if !toolkit.IsNilOrEmpty(id) {
			getWhere = []*dbox.Filter{dbox.Eq(toolkit.IdField(dataM), id)}
		}
	}

	var dataMaps []toolkit.M
	q.ReadFile(&dataMaps, filePath)

	if commandType == dbox.QueryPartInsert {
		hasCmdType.Set("hasInsert", true)

		if !hasData {
			return errorlib.Error(packageName, modCursor+".Exec", commandType, "Sorry data not found!, unable to insert data")
		}

		result := dbox.Find(dataMaps, getWhere)
		if len(result) > 0 {
			return errorlib.Error(packageName, modCursor+".Exec", commandType, "ID already exist, unable insert data ")
		}

		if dataIsSlice {
			var sliceData []toolkit.M
			for _, v := range dataMs {
				sliceData = finUpdateObj(dataMaps, v, "insert")
			}
			updatedValue = sliceData
		} else {
			updatedValue = finUpdateObj(dataMaps, dataM, "insert")
		}
	} else if commandType == dbox.QueryPartUpdate {
		hasCmdType.Set("hasUpdate", true)

		if !hasData {
			return errorlib.Error(packageName, modCursor+".Exec", commandType, "Sorry data not found!, unable to update data")
		}

		if hasWhere {
			var indexes []interface{}
			whereIndex := dbox.Find(dataMaps, getWhere)
			indexes = toolkit.ToInterfaceArray(&whereIndex)
			// toolkit.Printf("whereIndex>%v indexes%v\n", whereIndex, indexes)

			var dataUpdate toolkit.M
			var updateDataIndex int
			isDataSlice := toolkit.IsSlice(data)
			if isDataSlice == false {
				isDataSlice = false
				data, e = toolkit.ToM(data)
				if e != nil {
					return errorlib.Error(packageName, modQuery, "Exec: "+commandType, "Serde data fail"+e.Error())
				}

				e = toolkit.Serde(data, &dataUpdate, "")
				if e != nil {
					return errorlib.Error(packageName, modQuery, "Exec: "+commandType, "Serde data fail"+e.Error())
				}
			}

			for i, v := range dataMaps {
				if toolkit.HasMember(indexes, i) || !hasWhere {
					if isDataSlice {
						e = toolkit.Serde(toolkit.SliceItem(data, updateDataIndex), &dataUpdate, "")
						if e != nil {
							return errorlib.Error(packageName, modQuery, "Exec: "+commandType, "Serde data fail"+e.Error())
						}
						updateDataIndex++
					}

					dataOrigin := dataMaps[i]
					toolkit.CopyM(&dataUpdate, &dataOrigin, false, []string{"_id"})
					toolkit.Serde(dataOrigin, &v, "")
					dataMaps[i] = v
				}
			}
			updatedValue = dataMaps
		} else {
			updatedValue = finUpdateObj(dataMaps, dataM, "update")
		}
	} else if commandType == dbox.QueryPartDelete {
		hasCmdType.Set("hasDelete", true)
		// if multi {
		if hasWhere {
			result := dbox.Find(dataMaps, getWhere)
			if len(result) > 0 {
				for i, v := range dataMaps {
					if toolkit.HasMember(result, i) == false {
						updatedValue = append(updatedValue, v)
					}
				}
			}
		} else {
			updatedValue = []toolkit.M{}
		}
	} else if commandType == dbox.QueryPartSave {
		hasCmdType.Set("hasSave", true)
		if !hasData {
			return errorlib.Error(packageName, modCursor+".Exec", commandType, "Sorry data not found!, unable to update data")
		}

		q.dataType = "save"
		q.whereData = append(q.whereData, getWhere...)
		q.sliceData = append(q.sliceData, dataM)
	}

	if hasCmdType.Has("hasInsert") || hasCmdType.Has("hasUpdate") || hasCmdType.Has("hasDelete") {
		e = q.WriteFile(updatedValue)
		if e != nil {
			return errorlib.Error(packageName, modQuery+".Exec", commandType, e.Error())
		}
	}

	return nil
}
Exemplo n.º 5
0
func (q *Query) Exec(in toolkit.M) error {
	setting, e := q.prepare(in)
	commandType := setting["commandtype"].(string)
	if e != nil {
		return err.Error(packageName, modQuery, "Exec: "+commandType, e.Error())
	}

	if setting.GetString("commandtype") == dbox.QueryPartSelect {
		return err.Error(packageName, modQuery, "Exec: "+commandType, "Exec is not working with select command, please use .Cursor instead")
	}

	q.Lock()
	defer q.Unlock()

	var dataM toolkit.M
	var dataMs []toolkit.M

	hasData := in.Has("data")
	dataIsSlice := false
	data := in.Get("data")
	if toolkit.IsSlice(data) {
		dataIsSlice = true
		e = toolkit.Unjson(toolkit.Jsonify(data), dataMs)
		if e != nil {
			return err.Error(packageName, modQuery, "Exec: "+commandType, "Data encoding error: "+e.Error())
		}
	} else {
		dataM, e = toolkit.ToM(data)
		dataMs = append(dataMs, dataM)
		if e != nil {
			return err.Error(packageName, modQuery, "Exec: "+commandType, "Data encoding error: "+e.Error())
		}
	}

	hasWhere := in.Has("where")
	where := in.Get("where", []*dbox.Filter{}).([]*dbox.Filter)

	if hasData && hasWhere == false && toolkit.HasMember([]interface{}{dbox.QueryPartInsert, dbox.QueryPartUpdate, dbox.QueryPartSave}, commandType) {
		hasWhere = true
		if toolkit.IsSlice(data) {
			ids := []interface{}{}
			idField := ""
			if idField == "" {
				return err.Error(packageName, modQuery, "Exec:"+commandType, "Data send is a slice, but its element has no ID")
			}
			dataCount := toolkit.SliceLen(data)
			for i := 0; i < dataCount; i++ {
				dataI := toolkit.SliceItem(data, i)
				if i == 0 {
					idField = toolkit.IdField(dataI)
				}
				ids = append(ids, toolkit.Id(dataI))
			}
			where = []*dbox.Filter{dbox.In(idField, ids)}
		} else {
			id := toolkit.Id(data)
			if toolkit.IsNilOrEmpty(id) {
				where = []*dbox.Filter{dbox.Eq(toolkit.IdField(id), id)}
			} else {
				where = nil
				hasWhere = false
			}
		}
	}

	q.openFile()
	if commandType == dbox.QueryPartInsert {
		if !hasData {
			return err.Error(packageName, modQuery, "Exec:"+commandType, "Data is empty")
		}
		if dataIsSlice {
			q.data = append(q.data, dataMs...)
		} else {
			q.data = append(q.data, dataM)
		}
	} else if commandType == dbox.QueryPartUpdate {
		if !hasData {
			return err.Error(packageName, modQuery, "Exec:"+commandType, "Data is empty")
		}

		var indexes []interface{}
		if hasWhere {
			toolkit.Serde(dbox.Find(q.data, where), &indexes, "")
		}

		var dataUpdate toolkit.M
		var updateDataIndex int

		isDataSlice := toolkit.IsSlice(data)
		if isDataSlice == false {
			isDataSlice = false
			e = toolkit.Serde(data, &dataUpdate, "")
			if e != nil {
				return err.Error(packageName, modQuery, "Exec:"+commandType, "Unable to serialize data. "+e.Error())
			}
		}
		var idField string
		for i, v := range q.data {
			if toolkit.HasMember(indexes, i) || len(indexes) == 0 {
				if idField == "" {
					idField = toolkit.IdField(v)
					if idField == "" {
						return err.Error(packageName, modQuery, "Exec:"+commandType, "No ID")
					}
				}

				var dataOrigin toolkit.M
				e = toolkit.Serde(v, &dataOrigin, "")
				if e != nil {
					return err.Error(packageName, modQuery, "Exec:"+commandType, "Unable to serialize data origin. "+e.Error())
				}
				if isDataSlice {
					e = toolkit.Serde(toolkit.SliceItem(data, updateDataIndex), &dataUpdate, "")
					if e != nil {
						return err.Error(packageName, modQuery, "Exec:"+commandType, "Unable to serialize data. "+e.Error())
					}
					updateDataIndex++
				}
				for fieldName, fieldValue := range dataUpdate {
					if fieldName != idField {
						if dataOrigin.Has(fieldName) {
							dataOrigin.Set(fieldName, fieldValue)
						}

					}
				}
				toolkit.Serde(dataOrigin, &v, "")
				q.data[i] = v
			}
		}
	} else if commandType == dbox.QueryPartDelete {
		if hasWhere {
			var indexes []interface{}
			toolkit.Serde(dbox.Find(q.data, where), &indexes, "")
			if len(indexes) > 0 {
				newdata := []toolkit.M{}
				for index, v := range q.data {
					if toolkit.HasMember(indexes, index) == false {
						newdata = append(newdata, v)
					}
				}
				q.data = newdata
			}
		} else {
			q.data = []toolkit.M{}
		}
	} else if commandType == dbox.QueryPartSave {
		if !hasData {
			return err.Error(packageName, modQuery, "Exec:"+commandType, "Data is empty")
		}
	}
	q.writeFile()
	return nil
}
Exemplo n.º 6
0
func (cmd *Command) Exec(c *Crowd) error {
	if c.data == nil {
		return errors.New("Exec: Data is empty")
	}
	l := c.Len()
	if cmd.CommandType == CommandSum {
		fn := cmd.Fns[0]
		sum := float64(0)
		for i := 0; i < l; i++ {
			el := fn(c.Item(i))
			if !toolkit.IsNumber(el) {
				c.Result.Sum = 0
				return nil
			}
			item := toolkit.ToFloat64(el, 4, toolkit.RoundingAuto)
			sum += item
		}
		c.Result.Sum = sum
	} else if cmd.CommandType == CommandMin {
		fn := cmd.Fns[0]
		var ret interface{}
		for i := 0; i < l; i++ {
			item := fn(c.Item(i))
			if i == 0 {
				ret = item
			} else if toolkit.Compare(ret, item, "$gt") {
				ret = item
			}
		}
		c.Result.Min = ret
	} else if cmd.CommandType == CommandMax {
		fn := cmd.Fns[0]
		var ret interface{}
		for i := 0; i < l; i++ {
			item := fn(c.Item(i))
			if i == 0 {
				ret = item
			} else if toolkit.Compare(ret, item, "$lt") {
				ret = item
			}
		}
		c.Result.Max = ret
	} else if cmd.CommandType == CommandAvg {
		fn := cmd.Fns[0]
		ret := float64(0)
		for i := 0; i < l; i++ {
			el := fn(c.Item(i))
			if !toolkit.IsNumber(el) {
				c.Result.Sum = 0
				return nil
			}
			item := toolkit.ToFloat64(el, 4, toolkit.RoundingAuto)
			ret += item
		}
		c.Result.Avg = toolkit.Div(ret, toolkit.ToFloat64(l, 0, toolkit.RoundingAuto))
	} else if cmd.CommandType == CommandWhere {
		fn := cmd.Fns[0]
		el, _ := toolkit.GetEmptySliceElement(c.data)
		tel := reflect.TypeOf(el)
		array := reflect.MakeSlice(reflect.SliceOf(tel), 0, 0)
		for i := 0; i < l; i++ {
			item := c.Item(i)
			if fn(item).(bool) {
				//toolkit.Printfn("Where data %d: %v", i, item)
				array = reflect.Append(array, reflect.ValueOf(item))
			}
		}
		c.Result.data = array.Interface()
	} else if cmd.CommandType == CommandApply {
		fn := cmd.Fns[0]
		var array reflect.Value
		for i := 0; i < l; i++ {
			item := fn(c.Item(i))
			//toolkit.Printfn("Applying data %d of %d: %v", i, l, item)
			if i == 0 {
				//toolkit.Println(reflect.ValueOf(item).Type().String())
				array = reflect.MakeSlice(reflect.SliceOf(reflect.TypeOf(item)), 0, 0)
			}
			array = reflect.Append(array, reflect.ValueOf(item))
		}
		c.Result.data = array.Interface()
		c.data = c.Result.data
	} else if cmd.CommandType == CommandGroup {
		fng := cmd.Fns[0]
		fnc := cmd.Fns[1]
		mvs := map[interface{}]reflect.Value{}
		//mvo := map[interface{}]interface{}{}
		var mvo []KV
		for i := 0; i < l; i++ {
			item := c.Item(i)
			//toolkit.Printfn("Processing data %d of %d: %v", i, l, item)
			g := fng(item)
			gi := fnc(item)
			array, exist := mvs[g]
			if !exist {
				//array = []interface{}{}
				array = reflect.MakeSlice(reflect.SliceOf(reflect.TypeOf(gi)), 0, 0)
			}
			array = reflect.Append(array, reflect.ValueOf(gi))
			//toolkit.Println("Data:",g,array)
			mvs[g] = array
		}
		for k, v := range mvs {
			mvo = append(mvo, KV{k, v.Interface()})
		}
		c.Result.data = mvo
		c.data = mvo
	} else if cmd.CommandType == CommandSort {
		sorter, e := NewSorter(c.data, cmd.Fns[0])
		if e != nil {
			return e
		}

		var direction SortDirection
		direction = cmd.Parms.Get("direction", SortAscending).(SortDirection)
		c.Result.data = sorter.Sort(direction)

		c.data = c.Result.data
	} else if cmd.CommandType == CommandJoin {
		joinData := cmd.Parms.Get("joindata")
		if joinData == nil {
			return errors.New("crowd.join: Right side join data is nil")
		}
		if cmd.FnJoinKey == nil {
			cmd.FnJoinKey = func(x, y interface{}) bool {
				return x == y
			}
		}
		if cmd.FnJoinSelect == nil {
			cmd.FnJoinSelect = func(x, y interface{}) interface{} {
				return toolkit.M{}.Set("data1", x).Set("data2", y)
			}
		}
		l1 := toolkit.SliceLen(joinData)
		var array reflect.Value
		arrayBuilt := false
		for i := 0; i < l; i++ {
			item1 := c.Item(i)
			for i1 := 0; i1 < l1; i1++ {
				item2 := toolkit.SliceItem(joinData, i1)
				joinOK := cmd.FnJoinKey(item1, item2)
				if joinOK {
					outObj := cmd.FnJoinSelect(item1, item2)
					if !arrayBuilt {
						arrayBuilt = true
						array = reflect.MakeSlice(reflect.SliceOf(reflect.TypeOf(outObj)), 0, 0)
					}
					array = reflect.Append(array, reflect.ValueOf(outObj))
				}
			}
		}
		if !arrayBuilt {
			return errors.New("crowd.join: No match")
		}
		c.Result.data = array.Interface()
		c.data = array.Interface()
	} else {
		return errors.New(string(cmd.CommandType) + ": not yet applicable")
	}
	return nil
}