定義
構文
hasRoot の構文は次のとおりです。
1 { 2 $search: { 3 "index": "<index name>", // optional, defaults to "default" 4 "hasRoot": { 5 "operator": { 6 <operator-specification> 7 } 8 }, 9 "returnScope": { 10 "path": "<embedded-documents-field-to-retrieve>" 11 }, 12 "returnStoredSource": true, 13 } 14 }
フィールド
フィールド | タイプ | 説明 | 必要性 |
|---|---|---|---|
| オブジェクト | インデックスフィールド をクエリするために使用する演算子。これは、子ドキュメントをフィルタリングするための検索条件を指定します。 | 必須 |
要件
この演算子を使用するには、インデックス定義で次の操作を行う必要があります。
クエリ対象のルートレベルフィールドにインデックスを作成します。
取得するオブジェクトの配列を
embeddedDocumentsタイプとしてインデックス化します。検索するネストされたフィールドにはstoredSourceも設定する必要があります。
クエリでは、次の操作を行う必要があります。
演算子を検索するフィールドのスコープを設定するには、
returnScopeを指定します。storedSourceフィールドを返すには、returnStoredSourceをtrueに設定します。
例
このセクションの例では、 sample_training.companies名前空間を使用します。サンプルデータセット をロードし、コレクションにインデックスを作成 したら、このセクションで説明されるサンプルクエリを試すことができます。
サンプル インデックス
このセクションのクエリでは、次のインデックスを使用します。このインデックス定義により、 MongoDB Search は次の操作を実行するように構成されます。
コレクション内のすべての動的にインデックス付け可能なフィールドを自動的にインデックス化します。
、
productsfunding_rounds、funding_rounds.investmentsフィールドを embeddedDocuments 型としてインデックス化します。次のフィールドを
mongotに保存します。funding_rounds.raised_currency_codefunding_rounds.raised_amountfunding_rounds.investmentsproducts.name
1 { 2 "mappings": { 3 "dynamic": true, 4 "fields": { 5 "funding_rounds": { 6 "dynamic": true, 7 "fields": { 8 "investments": [ 9 { 10 "dynamic": true, 11 "type": "embeddedDocuments" 12 } 13 ] 14 }, 15 "storedSource": { 16 "include": [ 17 "raised_currency_code", 18 "raised_amount", 19 "investments" 20 ] 21 }, 22 "type": "embeddedDocuments" 23 }, 24 "products": { 25 "dynamic": true, 26 "storedSource": { 27 "include": [ 28 "name" 29 ] 30 }, 31 "type": "embeddedDocuments" 32 } 33 } 34 } 35 }
簡単なクエリ
次のクエリでは、ルートレベルフィールドfounded_year が 2005 から 2010 年の間にある products が返されます。
1 db.companies.aggregate([ 2 { 3 "$search": { 4 "returnStoredSource": true, 5 "returnScope": { "path": "products" }, 6 "hasRoot": { 7 "operator": { 8 "range": { 9 "path": "founded_year", 10 "gte": 2005, 11 "lte": 2010 12 } 13 } 14 } 15 } 16 } 17 ])
[ { name: 'Wikison Wetpaint' }, { name: 'Wetpaint Social Distribution System' }, { name: 'Omnidrive' }, { name: 'Twitter Blocks' }, { name: 'Twicco' }, { name: 'Slacker Web Player' }, { name: 'Slacker Desktop Radio' }, { name: 'Slacker Portable Player' }, { name: 'Babelgum' }, { name: 'Powerset' }, { name: 'OpenX Enterprise' }, { name: 'OpenX Market' }, { name: 'OpenX Lift' }, { name: 'Sparter' }, { name: 'Thoof' }, { name: 'MyFree411' }, { name: 'Wesabe' }, { name: 'Prosper' }, { name: 'Stickam' }, { name: 'PayPerLive.com' } ]
マルチレベル クエリ
次のクエリは、text 演算子を使用して Facebook という名前の会社を nameフィールドで検索し、次のすべての所有者(investments.person と investments.financial_org)による運用額(funding_rounds.raised_amount と funding_rounds.raised_currency_code)を取得します。会社。
1 db.companies.aggregate([ 2 { 3 "$search": { 4 "returnStoredSource": true, 5 "returnScope": { "path": "funding_rounds" }, 6 "hasRoot": { 7 "operator": { 8 "text": { 9 "path": "name", 10 "query": "Facebook" 11 } 12 } 13 } 14 } 15 } 16 ])
[ { raised_amount: 500000, raised_currency_code: 'USD', investments: [ { company: null, financial_org: null, person: { first_name: 'Peter', last_name: 'Thiel', permalink: 'peter-thiel' } }, { company: null, financial_org: null, person: { first_name: 'Reid', last_name: 'Hoffman', permalink: 'reid-hoffman' } } ] }, { raised_amount: 12700000, raised_currency_code: 'USD', investments: [ { company: null, financial_org: { name: 'Accel Partners', permalink: 'accel-partners' }, person: null }, { company: null, financial_org: null, person: { first_name: 'Mark', last_name: 'Pincus', permalink: 'mark-pincus' } }, { company: null, financial_org: null, person: { first_name: 'Reid', last_name: 'Hoffman', permalink: 'reid-hoffman' } } ] }, { raised_amount: 27500000, raised_currency_code: 'USD', investments: [ { company: null, financial_org: { name: 'Greylock Partners', permalink: 'greylock' }, person: null }, { company: null, financial_org: { name: 'Meritech Capital Partners', permalink: 'meritech-capital-partners' }, person: null }, { company: null, financial_org: { name: 'Founders Fund', permalink: 'founders-fund' }, person: null }, { company: null, financial_org: { name: 'SV Angel', permalink: 'sv-angel' }, person: null } ] }, { raised_amount: 240000000, raised_currency_code: 'USD', investments: [ { company: { name: 'Microsoft', permalink: 'microsoft' }, financial_org: null, person: null } ] }, { raised_amount: 60000000, raised_currency_code: 'USD', investments: [ { company: null, financial_org: null, person: { first_name: 'Li', last_name: 'Ka-shing', permalink: 'li-ka-shing' } }, { company: null, financial_org: { name: 'Horizons Ventures', permalink: 'horizons-ventures' }, person: null } ] }, { raised_amount: 15000000, raised_currency_code: 'USD', investments: [ { company: null, financial_org: { name: 'European Founders Fund', permalink: 'european-founders-fund' }, person: null } ] }, { raised_amount: 100000000, raised_currency_code: 'USD', investments: [ { company: null, financial_org: { name: 'TriplePoint Capital', permalink: 'triplepoint-capital' }, person: null } ] }, { raised_amount: 60000000, raised_currency_code: 'USD', investments: [ { company: null, financial_org: null, person: { first_name: 'Li', last_name: 'Ka-shing', permalink: 'li-ka-shing' } }, { company: null, financial_org: { name: 'Horizons Ventures', permalink: 'horizons-ventures' }, person: null } ] }, { raised_amount: 200000000, raised_currency_code: 'USD', investments: [ { company: null, financial_org: { name: 'Digital Sky Technologies', permalink: 'digital-sky-technologies-fo' }, person: null } ] }, { raised_amount: 210000000, raised_currency_code: 'USD', investments: [ { company: null, financial_org: { name: 'Elevation Partners', permalink: 'elevation-partners' }, person: null } ] }, { raised_amount: 1500000000, raised_currency_code: 'USD', investments: [ { company: null, financial_org: { name: 'Goldman Sachs', permalink: 'goldman-sachs' }, person: null }, { company: null, financial_org: { name: 'Digital Sky Technologies', permalink: 'digital-sky-technologies-fo' }, person: null } ] } ]
複合クエリ
次のクエリは、ネストされたfunding_rounds.investments フィールドで、Ventures namenetwork(description フィールドの任意)タームを含む金融組織を検索します。かつ、 タームを使用して説明された会社に( フィールドの任意の場所)、 )。クエリは、複合演算子を使用して次の項目を検索します。
embeddedDocument演算子を使用してネストされたfunding_rounds.investments.financial_org.nameフィールドhasRoot演算子を使用するルートレベルのdescriptionフィールド
returnScope は演算子のコンテキストを funding_rounds embeddedDocuments 型フィールドに設定し、returnStoredSourceフィールドをtrue に設定すると、storedSource フィールドのみが返されます。クエリは結果を 5 ドキュメントに制限します。
1 db.companies.aggregate([ 2 { 3 "$search": { 4 "compound": { 5 "should": [ 6 { 7 "embeddedDocument": { 8 "path": "funding_rounds.investments", 9 "operator": { 10 "wildcard": { 11 "path": "funding_rounds.investments.financial_org.name", 12 "query": "*Ventures*", 13 "allowAnalyzedField": true 14 } 15 } 16 } 17 }, 18 { 19 "hasRoot": { 20 "operator": { 21 "wildcard": { 22 "path": "description", 23 "query": "*network*", 24 "allowAnalyzedField": true 25 } 26 } 27 } 28 } 29 ] 30 }, 31 "returnScope": {"path": "funding_rounds"}, 32 "returnStoredSource": true 33 } 34 }, 35 { 36 "$limit": 5 37 } 38 ])
[ { raised_amount: 6500000, raised_currency_code: 'USD', investments: [ { company: null, financial_org: { name: 'Velocity Interactive Group', permalink: 'velocity-interactive-group' }, person: null }, { company: null, financial_org: { name: 'TELUS Ventures', permalink: 'telus-ventures' }, person: null }, { company: null, financial_org: { name: 'Charles River Ventures', permalink: 'charles-river-ventures' }, person: null }, { company: null, financial_org: { name: 'Partech Ventures', permalink: 'partech-international' }, person: null }, { company: null, financial_org: { name: 'Fidelity Ventures', permalink: 'fidelity-ventures' }, person: null }, { company: null, financial_org: { name: 'Star Ventures', permalink: 'star-ventures' }, person: null }, { company: null, financial_org: { name: 'Castile Ventures', permalink: 'castile-ventures' }, person: null } ] }, { raised_amount: 25000000, raised_currency_code: 'USD', investments: [ { company: null, financial_org: { name: 'Boulder Ventures', permalink: 'boulder-ventures' }, person: null }, { company: null, financial_org: { name: 'Sequel Venture Partners', permalink: 'sequel' }, person: null }, { company: null, financial_org: { name: 'Sprout Group', permalink: 'the-sprout-group' }, person: null }, { company: null, financial_org: { name: 'EPIC Ventures', permalink: 'epic-ventures' }, person: null }, { company: null, financial_org: { name: 'Garage Technology Ventures', permalink: 'garage-technology-ventures' }, person: null }, { company: null, financial_org: { name: 'Pritzker Group Venture Capital', permalink: 'pritzker-group-venture-capital' }, person: null }, { company: null, financial_org: { name: 'Ironside Ventures', permalink: 'ironside-ventures' }, person: null }, { company: null, financial_org: { name: 'Valhalla Partners', permalink: 'valhalla-partners' }, person: null }, { company: null, financial_org: { name: 'Vista Ventures', permalink: 'vista-ventures' }, person: null }, { company: null, financial_org: { name: 'JPMorgan Chase & Co', permalink: 'jpmorgan-chase-co' }, person: null }, { company: null, financial_org: { name: 'DFJ Portage Ventures', permalink: 'dfj-portage-ventures' }, person: null } ] }, { raised_amount: 49500000, raised_currency_code: 'USD', investments: [ { company: null, financial_org: { name: 'Versant Ventures', permalink: 'versant-ventures' }, person: null }, { company: null, financial_org: { name: 'Skyline Ventures', permalink: 'skyline-ventures' }, person: null }, { company: null, financial_org: { name: 'Three Arch Partners', permalink: 'three-arch-partners' }, person: null }, { company: null, financial_org: { name: 'Affinity Capital Management', permalink: 'affinity-capital-management' }, person: null }, { company: null, financial_org: { name: 'Alloy Ventures', permalink: 'alloy-ventures' }, person: null }, { company: null, financial_org: { name: 'Delphi Ventures', permalink: 'delphi-ventures' }, person: null }, { company: null, financial_org: { name: 'GBS Ventures', permalink: 'gbs-ventures' }, person: null }, { company: null, financial_org: { name: 'INVESCO Private Capital', permalink: 'invesco-private-capital' }, person: null }, { company: null, financial_org: { name: 'J.P. Morgan Securities Inc.', permalink: 'j-p-morgan-securities-inc' }, person: null }, { company: null, financial_org: { name: 'ONSET Ventures', permalink: 'onset-ventures' }, person: null } ] }, { raised_amount: 1400000, raised_currency_code: 'USD', investments: [ { company: null, financial_org: { name: 'Accelerator Ventures', permalink: 'accelerator-ventures' }, person: null }, { company: null, financial_org: { name: 'JAIC America', permalink: 'jaic-america' }, person: null }, { company: null, financial_org: { name: 'Pacific I&T Ventures', permalink: 'pacific-i-t-ventures' }, person: null }, { company: null, financial_org: null, person: { first_name: 'Eric', last_name: 'Di Benedetto', permalink: 'eric-di-benedetto' } }, { company: null, financial_org: { name: 'iSteps App Ventures', permalink: 'isteps-app-ventures' }, person: null }, { company: null, financial_org: null, person: { first_name: 'Ben T.', last_name: 'Smith, IV', permalink: 'ben-smith-iv' } }, { company: null, financial_org: null, person: { first_name: 'Tim', last_name: 'Stevens', permalink: 'tim-stevens' } }, { company: null, financial_org: null, person: { first_name: 'Fabrice', last_name: 'Grinda', permalink: 'fabrice-grinda' } }, { company: null, financial_org: { name: 'LaunchCapital', permalink: 'launchcapital' }, person: null } ] }, { raised_amount: 1000000, raised_currency_code: 'USD', investments: [ { company: null, financial_org: { name: 'DFJ Gotham Ventures', permalink: 'dfj-gotham-ventures' }, person: null }, { company: null, financial_org: { name: 'Metamorphic Ventures', permalink: 'metamorphic-ventures-llc' }, person: null }, { company: null, financial_org: { name: 'RRE Ventures', permalink: 'rre-ventures' }, person: null }, { company: null, financial_org: { name: 'Pilot Group', permalink: 'pilot-group' }, person: null }, { company: null, financial_org: { name: 'AOL Ventures', permalink: 'aol-ventures' }, person: null }, { company: null, financial_org: { name: 'Lerer Ventures', permalink: 'lerer-ventures' }, person: null }, { company: null, financial_org: { name: 'Bowery Capital', permalink: 'bowery-capital' }, person: null } ] } ]