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Merged
ricardohsmello merged 15 commits into from
May 11, 2026
Merged

Feature/code improvements #4

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469f70e
Including sl4j import for removing unnecessary log
ricardohsmello Apr 30, 2026
d73c48b
chore: upgrade MongoDB Java driver and remove unnecessary SLF4J logs
ricardohsmello May 8, 2026
a865451
Simplify $match aggregation example using exact title filter
ricardohsmello May 8, 2026
0fc4e77
Add $limit and $project aggregation example
ricardohsmello May 8, 2026
19d5ff2
Add dedicated $project aggregation example and explanation
ricardohsmello May 8, 2026
c44f151
refactor: simplify aggregation limit examples and improve descriptions
ricardohsmello May 8, 2026
38e22e9
refactor: improve aggregation sort example and description
ricardohsmello May 8, 2026
1f84f7d
refactor: simplify challenge boilerplate so learners can focus on pip…
ricardohsmello May 8, 2026
59f0f5c
Including simple comments
ricardohsmello May 8, 2026
0f95084
refactor: improve array aggregation examples and explanatory notes
ricardohsmello May 8, 2026
3e771dd
refactor: improve unwind example readability and projection style
ricardohsmello May 8, 2026
74f3144
Including books collection
ricardohsmello May 8, 2026
8fa7e65
refactor: improve lookup challenge scaffolding and notebook guidance
ricardohsmello May 8, 2026
d5c972a
refactor: improve group example wording and formatting
ricardohsmello May 8, 2026
b5be334
refactor: improve group challenges and add clearer aggregation hints
ricardohsmello May 8, 2026
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refactor: improve array aggregation examples and explanatory notes
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@ricardohsmello
ricardohsmello committed May 8, 2026
commit 0f9508424e3f428408823368e2737b1b78456ec0
1 change: 0 additions & 1 deletion java/100_aggregation_pipeline_match.ipynb
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Original file line number Diff line number Diff line change
Expand Up @@ -67,7 +67,6 @@
"import org.bson.conversions.Bson;\n",
"\n",
"// Configure SLF4J Simple Logger to suppress MongoDB driver logs in the notebook output.\n",
"\n",
"System.setProperty(\"org.slf4j.simpleLogger.defaultLogLevel\", \"off\");\n",
"System.setProperty(\"org.slf4j.simpleLogger.log.org.mongodb.driver\", \"off\");\n",
"\n",
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40 changes: 24 additions & 16 deletions java/101_aggregation_pipeline_arrays.ipynb
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Original file line number Diff line number Diff line change
Expand Up @@ -56,6 +56,9 @@
"import static com.mongodb.client.model.Filters.in;\n",
"import static com.mongodb.client.model.Sorts.descending;\n",
"\n",
"import static com.mongodb.client.model.Projections.include;\n",
"import static com.mongodb.client.model.Projections.excludeId;\n",
"import static com.mongodb.client.model.Projections.fields;\n",
"\n",
"import static com.mongodb.client.model.Aggregates.match;\n",
"import static com.mongodb.client.model.Aggregates.project;\n",
Expand All @@ -66,7 +69,6 @@
"import org.bson.conversions.Bson;\n",
"\n",
"// Configure SLF4J Simple Logger to suppress MongoDB driver logs in the notebook output.\n",
"\n",
"System.setProperty(\"org.slf4j.simpleLogger.defaultLogLevel\", \"off\");\n",
"System.setProperty(\"org.slf4j.simpleLogger.log.org.mongodb.driver\", \"off\");\n",
"\n",
Expand Down Expand Up @@ -118,15 +120,18 @@
},
"outputs": [],
"source": [
"AggregateIterable<Document> result = books.aggregate(Arrays.asList(\n",
" Aggregates.match(Filters.all(\"genres\", \"Family Life\", \"Fiction\")),\n",
" Aggregates.project(new Document()\n",
" .append(\"title\", 1)\n",
" .append(\"genres\", 1)\n",
"AggregateIterable<Document> result = books.aggregate(\n",
" List.of(\n",
" match(all(\"genres\", \"Family Life\", \"Fiction\")),\n",
" project(\n",
" fields(\n",
" include(\"title\", \"genres\"),\n",
" excludeId()\n",
" )\n",
" )\n",
" )\n",
"));\n",
");\n",
"\n",
"// Iterate through the results\n",
"for (Document doc : result) {\n",
" System.out.println(\"book: \" + doc.toJson());\n",
"}"
Expand All @@ -137,7 +142,7 @@
"id": "9f6caab3",
"metadata": {},
"source": [
"### $match: $in\n",
"### $match with the `$in` operator\n",
"\n",
"Use `$in` to find books where the `genres` array contains at least one of the specified values."
]
Expand All @@ -153,15 +158,18 @@
},
"outputs": [],
"source": [
"AggregateIterable<Document> result = books.aggregate(Arrays.asList(\n",
" Aggregates.match(Filters.in(\"genres\", \"Family Life\", \"Fiction\")),\n",
" Aggregates.project(new Document()\n",
" .append(\"title\", 1)\n",
" .append(\"genres\", 1)\n",
"// Note: `Document` can also be used here because it implements `Bson`.\n",
"\n",
"AggregateIterable<Document> result = books.aggregate(\n",
" List.of(\n",
" Aggregates.match(Filters.in(\"genres\", \"Family Life\", \"Fiction\")),\n",
" Aggregates.project(new Document()\n",
" .append(\"title\", 1)\n",
" .append(\"genres\", 1)\n",
" )\n",
" )\n",
"));\n",
");\n",
"\n",
"// Iterate through the results\n",
"for (Document doc : result) {\n",
" System.out.println(\"book: \" + doc.toJson());\n",
"}"
Expand Down