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Add query debugging function for MongoDB aggregation #2

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Add query debugging function for MongoDB aggregation #2

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26 changes: 23 additions & 3 deletions world_cup/views.py
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Original file line number Diff line number Diff line change
Expand Up @@ -54,6 +54,23 @@ def top_scorers(request):
},
}

def _get_query(queryset):
"""Print the collection and aggregation pipeline behind `queryset`."""
if isinstance(queryset, RawQuerySet):
# raw_aggregate() pipelines are already MQL: RawQuery has no compiler,
# it just holds the pipeline that gets handed to collection.aggregate().
collection = queryset.model._meta.db_table
pipeline = queryset.query.pipeline
else:
compiler = queryset.query.get_compiler(using=queryset.db)
# Same steps the backend takes in SQLCompiler.as_sql()/explain_query().
compiler.pre_sql_setup()
# The compiler needs the columns to project.
columns = compiler.get_project_columns(compiler.columns)
mongo_query = compiler.build_query(columns)
collection = compiler.collection_name
pipeline = mongo_query.get_pipeline()
return f'db.world_cup_match.aggregate({pipeline})'

def _execute_query(query_text):
"""Parse and execute a user query, return result dict."""
Expand All @@ -66,6 +83,7 @@ def _execute_query(query_text):
.aggregate(tournament_goals=Sum("total_goals"))
)
return {
"query": _get_query(result),
"results": [{"tournament_goals": result["tournament_goals"] or 0}],
}

Expand All @@ -79,6 +97,7 @@ def _execute_query(query_text):
]
results = Match.objects.raw_aggregate(pipeline)
return {
"query": _get_query(results),
"results": [{"scorer": r.pk, "goals": r.total_goals} for r in results],
}

Expand All @@ -87,7 +106,7 @@ def _execute_query(query_text):
from django.db.models import Q
matches = Match.objects.filter(Q(team1__iexact=team) | Q(team2__iexact=team)).order_by("date")
return {
"query": f'db.world_cup_match.aggregate([{{$match: {{$or: [{{team1: {{$regex: "^{team}$", $options: "i"}}}}, {{team2: {{$regex: "^{team}$", $options: "i"}}}}]}}}}, {{$sort: {{date: 1}}}}])',
"query": _get_query(matches),
"results": [
{
"date": str(m.date),
Expand All @@ -104,7 +123,7 @@ def _execute_query(query_text):
round_name = query_text.strip()[6:].strip()
matches = Match.objects.filter(round__icontains=round_name).order_by("date")
return {
"query": f'db.world_cup_match.aggregate([{{$match: {{round: {{$regex: "{round_name}", $options: "i"}}}}}}, {{$sort: {{date: 1}}}}])',
"query": _get_query(matches),
"results": [
{
"date": str(m.date),
Expand All @@ -128,6 +147,7 @@ def _execute_query(query_text):
]
results = Match.objects.raw_aggregate(pipeline)
return {
"query": _get_query(results),
"results": [{"round": r.pk, "goals": r.total_goals, "matches": r.matches} for r in results],
}

Expand All @@ -150,4 +170,4 @@ def query_shell(request):
context["mongo_query"] = result.get("query", "")
context["results"] = result.get("results", [])

return render(request, "world_cup/shell.html", context)
return render(request, "world_cup/shell.html", context)