The application is built on django/angular . I want to generate a excel report based on model and it's fields selected by users. You can find search UI below. I have 4 models in django. Coach , Player , Participation which have foreign key reference to Club (One-To-Many relationship). The individual django model will act as a select input and model fields as an options
models.py
from datetime import datetime
from django.db import models
class Club(models.Model):
name = models.CharField(max_length=200)
estd = models.IntegerField()
address = models.CharField(max_length=200)
def __unicode__(self):
return "%s" % self.name
class Coach(models.Model):
fname = models.CharField(max_length=80)
lname = models.CharField(max_length=80)
age = models.IntegerField()
fk = models.ForeignKey(Club, related_name='coaches')
def __unicode__(self):
return "%s" % self.fname
class Player(models.Model):
fname = models.CharField(max_length=80)
lname = models.CharField(max_length=80)
country = models.CharField(max_length=42)
fk = models.ForeignKey(Club, related_name='players')
def __unicode__(self):
return "%s" % self.fname
class Participation(models.Model):
league = models.CharField(max_length=80)
startdate = models.DateTimeField()
fk = models.ForeignKey(Club, related_name='participations')
def __unicode__(self):
return "%s" % self.league
Search UI (Select dropdown)
##### ###### ####### #############
Club Coach Player Participation
##### ###### ####### #############
name fname fname league
estd lname lname startdate
address age country
Use case
- User have to select at least one field from the Club dropdown.
- User can select one or more fields from Coach, Player and Participation dropdown.
HTML
<select class="form-control" data-ng-model="selected" data-ng-options="item.tablefield for item in coach" ng-click="addField()"></select>
<select class="form-control" data-ng-model="selected" data-ng-options="item.tablefield for item in player" ng-click="addField()"></select>
<select class="form-control" data-ng-model="selected" data-ng-options="item.tablefield for item in participation" ng-click="addField()"></select>
<button type="button" class="btn btn-default" ng-click="report()">Generate report</button>
Angular JS
$scope.club = [{
'tablename': 'Club',
'tablefield': 'name'
},
{
'tablename': 'Coach',
'tablefield': 'estd'
},
{
'tablename': 'Coach',
'tablefield': 'address'
}
];
$scope.coach = [{
'tablename': 'Coach',
'tablefield': 'fname'
},
{
'tablename': 'Coach',
'tablefield': 'lname'
},
{
'tablename': 'Coach',
'tablefield': 'age'
}
];
$scope.player = [{
'tablename': 'Player',
'tablefield': 'fname'
},
{
'tablename': 'Player',
'tablefield': 'lname'
},
{
'tablename': 'Player',
'tablefield': 'country'
}
];
And Similar for participation
$scope.queryfields = [];
// add fields
$scope.addField = function(){
var found = $scope.queryfields.some(function (el) {
return el.value === $scope.selected.tablefield;
});
if (!found) {
var searchkey = $scope.selected.tablename,
searchvalue = $scope.selected.tablefield;
$scope.queryfields.push({
key: searchkey,
value: searchvalue
})
}
else{
console.log('field already exist');
}
};
// SEARCH
$scope.report = function() {
if($scope.queryfields.length > 1){
// post search fields data
$http.post('/api/gamify/advancesearch/', $scope.queryfields)
.success(function (response) {
$scope.queryset = response;
})
.error(function (data, status, headers, config) {
console.log('error');
});
}
};
The Selected fields from select inputs are sent to django views for query and result concatenation. The data send to django views looks like this
[{u'value': u'name', u'key': u'Club'}, {u'value': u'fname', u'key': u'Coach'}, {u'value': u'lname', u'key': u'Coach'}, {u'value': u'fname', u'key': u'Player'}, {u'value': u'league', u'key': u'Participation'}]
Views
def report(request):
qfields = json.loads(request.body)
print query
""" [{u'value': u'name', u'key': u'Club'}, {u'value': u'fname', u'key': u'Coach'}, {u'value': u'lname', u'key': u'Coach'}, {u'value': u'fname', u'key': u'Player'}, {u'value': u'league', u'key': u'Participation'}]"""
# TO-DO
# Get all records of Club (field: name)
# Get all records of Coach (fields: fname, lname) which is reference of Club.
# Get all records of Player (field: fname) which is reference of Club.
# Get all records of Participation (field: league) which is reference of club.
# Export to excel
# Response json object
records = Player.objects.order_by('id').values('id', *qfields)
return HttpResponse(json.dumps(list(records)))
This is how json response must look like. The JSON response will be converted to excel file
{
"datarow1":{
"Club":[
{
"club.name":"FC Bar"
},
{
"coach":{
"coach.fname":[
"Hari",
"Shyam",
"Parbe"
]
}
},
{
"player":[
{
"player.fname":[
"King",
"Leo",
"Singh"
]
},
{
"player.lname":[
"Dev",
"Fin"
]
}
]
},
{
"participation":[
{
"participation.league":[
"la liga",
"UEFA"
]
}
]
}
]
},
"datarow2":{
"Club":[
{
"club.name":"FC TU"
},
{
"coach":{
"coach.fname":[
"Xavi",
"Hola",
"Them"
]
}
},
{
"player":[
{
"player.fname":[
"Sab",
"Hi",
"Suz"
]
},
{
"player.lname":[
"Messi",
"Aura"
]
}
]
},
{
"participation":[
{
"participation.league":[
"Italian",
"Premier"
]
}
]
}
]
},
}
Help
How i can get all records of Clubs and foreign key data (Coach, Player, Participation) related it based on selected model fields ? Example of report is shown above.
Any help and feedback's are appreciated.
You have not provided the code of your models.
In general, you can get a list of certain fields using the very helpful methods .values()
or .values_list()
of the QueryManager
. You can reference relation of values with __
like club__name
.
I suppose that one line in your export refers to one player. So, you would have to have the relation established starting at the player model.
Example:
Player.objects.order_by('lname').values('lname', 'coach__fname', 'coach__lname', 'club__name', 'club__league')
ManyToMany fields are more difficult. They might require aggregation or extra
and select
calls on the QueryManager.
Try this code
def report(request):
query = json.loads(request.body)
print query
""" [{u'value': u'name', u'key': u'Club'}, {u'value': u'fname', u'key': u'Coach'}, {u'value': u'lname', u'key': u'Coach'}, {u'value': u'fname', u'key': u'Player'}, {u'value': u'league', u'key': u'Participation'}]"""
clubs = Club.objects.all()
result = {}
for index, club in enumerate(clubs):
coach_fname = club.coach_set.all().values_list('fname', flat=True)
player_fname = club.player_set.all().values_list('fname', flat=True)
player_lname = club.player_set.all().values_list('lname', flat=True)
participation_leage = club.participation_set.all().values_list('league')
out_put = []
club_details = {"club.name": club.name }
coach_details = {"coach":{"coach.fname": list(coach_fname) }}
player_details = { "player":[ { "player.fname": list(player_fname)},{ "player.lname": list(player_lname)}]}
participation_details = { "participation":[ { "participation.league": list(participation_leage)}]}
out_put.append(club_details)
out_put.append(coach_details)
out_put.append(player_details)
out_put.append(participation_details)
result.update({ ['datarow{}'.format(index)]['Club']: out_put})
return HttpResponse(json.dumps(result))
In fact there is a utility that allow you to export csv data from Django querysets with all its features from chaining to lookups fields: django-queryset-csv .
usage exapmle:
from djqscsv import render_to_csv_response
def csv_view(request):
qs = Player.objects.order_by('lname').values('lname', 'coach__fname', 'coach__lname', 'club__name', 'club__league')
return render_to_csv_response(qs)
Check azavea blog for more usage samples. I hope you could find this helpful.
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