绗叓绔狅細绮変笣

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杩欐槸涓婂浘涓叧鑱旇〃鐨勭洿鎺ョ炕璇戙€?璇锋敞鎰忥紝鎴戞病鏈夊儚鎴戜负鐢ㄦ埛鍜岀敤鎴峰姩鎬佹墍鍋氱殑閭ｆ牱锛屽皢琛ㄥ０鏄庝负妯″瀷銆?鍥犱负杩欐槸涓€涓櫎浜嗗閿病鏈夊叾浠栨暟鎹殑杈呭姪琛紝鎵€浠ユ垜鍒涘缓瀹冪殑鏃跺€欐病鏈夊叧鑱斿埌妯″瀷绫汇€?/p>

鐜板湪鎴戝彲浠ュ湪鐢ㄦ埛琛ㄤ腑澹版槑澶氬澶氱殑鍏崇郴浜嗭細

寤虹珛鍏崇郴鐨勮繃绋嬪疄灞炰笉鏄撱€?灏卞儚鎴戜负post涓€瀵瑰鍏崇郴鎵€鍋氱殑閭ｆ牱锛屾垜浣跨敤db.relationship鍑芥暟鏉ュ畾涔夋ā鍨嬬被涓殑鍏崇郴銆?杩欑鍏崇郴灏?code style="box-sizing: border-box; text-align: left; border: 1px solid rgb(223, 226, 229); border-radius: 3px; padding: 2px 4px 0px; font-size: 0.9rem; background-color: rgb(248, 248, 248);">User瀹炰緥鍏宠仈鍒板叾浠?code style="box-sizing: border-box; text-align: left; border: 1px solid rgb(223, 226, 229); border-radius: 3px; padding: 2px 4px 0px; font-size: 0.9rem; background-color: rgb(248, 248, 248);">User瀹炰緥锛屾墍浠ユ寜鐓ф儻渚嬶紝瀵逛簬閫氳繃杩欑鍏崇郴鍏宠仈鐨勪竴瀵圭敤鎴锋潵璇达紝宸︿晶鐢ㄦ埛鍏虫敞鍙充晶鐢ㄦ埛銆?鎴戝湪宸︿晶鐨勭敤鎴蜂腑瀹氫箟浜?code style="box-sizing: border-box; text-align: left; border: 1px solid rgb(223, 226, 229); border-radius: 3px; padding: 2px 4px 0px; font-size: 0.9rem; background-color: rgb(248, 248, 248);">followed鐨勫叧绯伙紝鍥犱负褰撴垜浠庡乏渚ф煡璇㈣繖涓叧绯绘椂锛屾垜灏嗗緱鍒板凡鍏虫敞鐨勭敤鎴峰垪琛紙鍗冲彸渚х殑鍒楄〃锛夈€?璁╂垜浠€愪釜妫€鏌ヨ繖涓?code style="box-sizing: border-box; text-align: left; border: 1px solid rgb(223, 226, 229); border-radius: 3px; padding: 2px 4px 0px; font-size: 0.9rem; background-color: rgb(248, 248, 248);">db.relationship()鎵€鏈夌殑鍙傛暟锛?/p>

  • 鈥楿ser鈥?/code>鏄叧绯诲綋涓殑鍙充晶瀹炰綋锛堝皢宸︿晶瀹炰綋鐪嬫垚鏄笂绾х被锛夈€傜敱浜庤繖鏄嚜寮曠敤鍏崇郴锛屾墍浠ユ垜涓嶅緱涓嶅湪涓や晶閮戒娇鐢ㄥ悓涓€涓疄浣撱€?/li>
  • secondary 鎸囧畾浜嗙敤浜庤鍏崇郴鐨勫叧鑱旇〃锛屽氨鏄娇鐢ㄦ垜鍦ㄤ笂闈㈠畾涔夌殑followers銆?/li>
  • primaryjoin 鎸囨槑浜嗛€氳繃鍏崇郴琛ㄥ叧鑱斿埌宸︿晶瀹炰綋锛堝叧娉ㄨ€咃級鐨勬潯浠?銆傚叧绯讳腑鐨勫乏渚х殑join鏉′欢鏄叧绯昏〃涓殑follower_id瀛楁涓庤繖涓叧娉ㄨ€呯殑鐢ㄦ埛ID鍖归厤銆?code style="box-sizing: border-box; text-align: left; border: 1px solid rgb(223, 226, 229); border-radius: 3px; padding: 2px 4px 0px; font-size: 0.9rem; background-color: rgb(248, 248, 248);">followers.c.follower_id琛ㄨ揪寮忓紩鐢ㄤ簡璇ュ叧绯昏〃涓殑follower_id鍒椼€?/li>
  • secondaryjoin 鎸囨槑浜嗛€氳繃鍏崇郴琛ㄥ叧鑱斿埌鍙充晶瀹炰綋锛堣鍏虫敞鑰咃級鐨勬潯浠?銆?杩欎釜鏉′欢涓?code style="box-sizing: border-box; text-align: left; border: 1px solid rgb(223, 226, 229); border-radius: 3px; padding: 2px 4px 0px; font-size: 0.9rem; background-color: rgb(248, 248, 248);">primaryjoin绫讳技锛屽敮涓€鐨勫尯鍒湪浜庯紝鐜板湪鎴戜娇鐢ㄥ叧绯昏〃鐨勫瓧娈电殑鏄?code style="box-sizing: border-box; text-align: left; border: 1px solid rgb(223, 226, 229); border-radius: 3px; padding: 2px 4px 0px; font-size: 0.9rem; background-color: rgb(248, 248, 248);">followed_id浜嗐€?/li>
  • backref瀹氫箟浜嗗彸渚у疄浣撳浣曡闂鍏崇郴銆傚湪宸︿晶锛屽叧绯昏鍛藉悕涓?code style="box-sizing: border-box; text-align: left; border: 1px solid rgb(223, 226, 229); border-radius: 3px; padding: 2px 4px 0px; font-size: 0.9rem; background-color: rgb(248, 248, 248);">followed锛屾墍浠ュ湪鍙充晶鎴戝皢浣跨敤followers鏉ヨ〃绀烘墍鏈夊乏渚х敤鎴风殑鍒楄〃锛屽嵆绮変笣鍒楄〃銆傞檮鍔犵殑lazy鍙傛暟琛ㄧず杩欎釜鏌ヨ鐨勬墽琛屾ā寮忥紝璁剧疆涓哄姩鎬佹ā寮忕殑鏌ヨ涓嶄細绔嬪嵆鎵ц锛岀洿鍒拌璋冪敤锛岃繖涔熸槸鎴戣缃敤鎴峰姩鎬佷竴瀵瑰鐨勫叧绯荤殑鏂瑰紡銆?/li>
  • lazy鍜?code style="box-sizing: border-box; text-align: left; border: 1px solid rgb(223, 226, 229); border-radius: 3px; padding: 2px 4px 0px; font-size: 0.9rem; background-color: rgb(248, 248, 248);">backref涓殑lazy绫讳技锛屽彧涓嶈繃褰撳墠鐨勮繖涓槸搴旂敤浜庡乏渚у疄浣擄紝backref涓殑鏄簲鐢ㄤ簬鍙充晶瀹炰綋銆?/li>

濡傛灉鐞嗚В璧锋潵姣旇緝鍥伴毦锛屼綘涔熶笉蹇呰繃浜庢媴蹇冦€傛垜寰呬細鍎垮氨浼氬悜浣犲睍绀哄浣曞埄鐢ㄨ繖浜涘叧绯绘潵鎵ц鏌ヨ锛屼竴鍒囧氨浼氬彉寰楁竻鏅版槑浜嗐€?/p>

鏁版嵁搴撶殑鍙樻洿锛岄渶瑕佽褰曞埌涓€涓柊鐨勬暟鎹簱杩佺Щ涓細

鏌ョ湅宸插叧娉ㄧ敤鎴风殑鍔ㄦ€?/h2>

鍦ㄦ暟鎹簱涓敮鎸佺矇涓濇満鍒剁殑宸ヤ綔鍑犺繎灏惧０锛屼絾鏄垜鍗撮仐婕忎簡涓€椤归噸瑕佺殑鍔熻兘銆傚簲鐢ㄤ富椤典腑闇€瑕佸睍绀哄凡鐧诲綍鐢ㄦ埛鍏虫敞鐨勫叾浠栨墍鏈夌敤鎴风殑鍔ㄦ€侊紝鎴戦渶瑕佺敤鏁版嵁搴撴煡璇㈡潵杩斿洖杩欎簺鐢ㄦ埛鍔ㄦ€併€?/p>

鏈€鏄捐€屾槗瑙佺殑鏂规鏄厛鎵ц涓€涓煡璇互杩斿洖宸插叧娉ㄧ敤鎴风殑鍒楄〃锛屽浣犳墍鐭ワ紝鍙互浣跨敤user.followed.all()璇彞銆傜劧鍚庡姣忎釜宸插叧娉ㄧ殑鐢ㄦ埛鎵ц涓€涓煡璇㈡潵杩斿洖浠栦滑鐨勭敤鎴峰姩鎬併€傛渶鍚庡皢鎵€鏈夌敤鎴风殑鍔ㄦ€佹寜鐓ф棩鏈熸椂闂村€掑簭鍚堝苟鍒颁竴涓垪琛ㄤ腑銆傚惉璧锋潵涓嶉敊锛熷叾瀹炰笉鐒躲€?/p>

杩欑鏂规硶鏈夊嚑涓棶棰樸€?濡傛灉涓€涓敤鎴峰叧娉ㄤ簡涓€鍗冧汉锛屼細鍙戠敓浠€涔堬紵 鎴戦渶瑕佹墽琛屼竴鍗冧釜鏁版嵁搴撴煡璇㈡潵鏀堕泦鎵€鏈夌殑鐢ㄦ埛鍔ㄦ€併€?鐒跺悗鎴戦渶瑕佸悎骞跺拰鎺掑簭鍐呭瓨涓殑涓€鍗冧釜鍒楄〃銆?浣滀负绗簩涓棶棰橈紝鑰冭檻鍒板簲鐢ㄤ富椤垫渶缁堝皢瀹炵幇鍒嗛〉锛屾墍浠ュ畠涓嶄細鏄剧ず鎵€鏈夊彲鐢ㄧ殑鐢ㄦ埛鍔ㄦ€侊紝鍙兘鏄墠鍑犱釜锛屽苟鏄剧ず涓€涓摼鎺ユ潵鎻愪緵鎰熷叴瓒ｇ殑鐢ㄦ埛鏌ョ湅鏇村鍔ㄦ€併€?濡傛灉鎴戣鎸夊畠浠殑鏃ユ湡鎺掑簭鏉ユ樉绀哄姩鎬侊紝鎴戞€庝箞鑳界煡閬撳摢浜涚敤鎴峰姩鎬佹墠鏄墍鏈夌敤鎴蜂腑鏈€鏂扮殑鍛紵闄ら潪鎴戦鍏堝緱鍒颁簡鎵€鏈夌殑鐢ㄦ埛鍔ㄦ€佸苟瀵瑰叾杩涜鎺掑簭銆?杩欏疄闄呬笂鏄竴涓碂绯曠殑瑙ｅ喅鏂规锛屼笉鑳藉緢濂藉湴搴斿瑙勬ā鍖栥€?/p>

鐢ㄦ埛鍔ㄦ€佺殑鍚堝苟鍜屾帓搴忔搷浣滄槸鏃犳硶閬垮厤鐨勶紝浣嗘槸鍦ㄥ簲鐢ㄤ腑鎵ц浼氬鑷存晥鐜囧崄鍒嗕綆涓嬶紝 鑰岃繖绉嶅伐浣滄槸鍏崇郴鏁版嵁搴撴搮闀跨殑銆?鎴戝彲浠ヤ娇鐢ㄦ暟鎹簱鐨勭储寮曪紝鍛戒护瀹冧互鏇存湁鏁堢殑鏂瑰紡鎵ц鏌ヨ鍜屾帓搴忋€?鎵€浠ユ垜鐪熸鎯宠鎻愪緵鐨勬柟妗堟槸锛屽畾涔夋垜鎯宠寰楀埌鐨勪俊鎭潵鎵ц涓€涓暟鎹簱鏌ヨ锛岀劧鍚庤鏁版嵁搴撴壘鍑哄浣曚互鏈€鏈夋晥鐨勬柟寮忔潵鎻愬彇杩欎簺淇℃伅銆?/p>

鐪嬬湅涓嬮潰鐨勮繖涓煡璇細

杩欐槸杩勪粖涓烘鎴戝湪杩欎釜搴旂敤涓娇鐢ㄧ殑鏈€澶嶆潅鐨勬煡璇€?鎴戝皢灏濊瘯涓€姝ヤ竴姝ュ湴瑙ｈ杩欎釜鏌ヨ銆?濡傛灉浣犵湅涓€涓嬭繖涓煡璇㈢殑缁撴瀯锛屼綘浼氭敞鎰忓埌鏈変笁涓富瑕侀儴鍒嗭紝鍒嗗埆鏄?code style="box-sizing: border-box; text-align: left; border: 1px solid rgb(223, 226, 229); border-radius: 3px; padding: 2px 4px 0px; font-size: 0.9rem; background-color: rgb(248, 248, 248);">join()銆?code style="box-sizing: border-box; text-align: left; border: 1px solid rgb(223, 226, 229); border-radius: 3px; padding: 2px 4px 0px; font-size: 0.9rem; background-color: rgb(248, 248, 248);">filter()鍜?code style="box-sizing: border-box; text-align: left; border: 1px solid rgb(223, 226, 229); border-radius: 3px; padding: 2px 4px 0px; font-size: 0.9rem; background-color: rgb(248, 248, 248);">order_by()锛屼粬浠兘鏄疭QLAlchemy鏌ヨ瀵硅薄鐨勬柟娉曪細

鑱斿悎鏌ヨ

瑕佺悊瑙oin鎿嶄綔鐨勫姛鑳斤紝鎴戜滑鏉ョ湅涓€涓緥瀛愩€?鍋囪鎴戞湁涓€涓寘鍚互涓嬪唴瀹圭殑User琛細

idusername
1john
2susan
3mary
4david

涓轰簡绠€鍗曡捣瑙侊紝鎴戝彧浼氫繚鐣欑敤鎴锋ā鍨嬬殑id鍜?code style="box-sizing: border-box; text-align: left; border: 1px solid rgb(223, 226, 229); border-radius: 3px; padding: 2px 4px 0px; font-size: 0.9rem; background-color: rgb(248, 248, 248);">username瀛楁浠ヤ究杩涜鏌ヨ锛屽叾浠栫殑閮界暐鍘汇€?/p>

鍋囪followers鍏崇郴琛ㄤ腑鏁版嵁琛ㄨ揪鐨勬槸鐢ㄦ埛john鍏虫敞鐢ㄦ埛susan鍜?nbsp;david锛岀敤鎴?code style="box-sizing: border-box; text-align: left; border: 1px solid rgb(223, 226, 229); border-radius: 3px; padding: 2px 4px 0px; font-size: 0.9rem; background-color: rgb(248, 248, 248);">susan鍏虫敞鐢ㄦ埛mary锛岀敤鎴?code style="box-sizing: border-box; text-align: left; border: 1px solid rgb(223, 226, 229); border-radius: 3px; padding: 2px 4px 0px; font-size: 0.9rem; background-color: rgb(248, 248, 248);">mary鍏虫敞鐢ㄦ埛david銆傝繖浜涚殑鏁版嵁濡備笅琛ㄦ墍绀猴細

follower_idfollowed_id
12
14
23
34

鏈€鍚庯紝鐢ㄦ埛鍔ㄦ€佽〃涓寘鍚簡姣忎釜鐢ㄦ埛鐨勪竴鏉″姩鎬侊細

idtextuser_id
1post from susan2
2post from mary3
3post from david4
4post from john1

杩欏紶琛ㄤ篃鐪佺暐浜嗕竴浜涗笉灞炰簬杩欎釜璁ㄨ鑼冨洿鐨勫瓧娈点€?/p>

杩欐槸鎴戜负璇ユ煡璇㈠啀娆¤璁＄殑join()璋冪敤锛?/p>

鎴戝湪鐢ㄦ埛鍔ㄦ€佽〃涓婅皟鐢╦oin鎿嶄綔銆?绗竴涓弬鏁版槸followers鍏宠仈琛紝绗簩涓弬鏁版槸join鏉′欢銆?鎴戠殑杩欎釜璋冪敤琛ㄨ揪鐨勫惈涔夋槸鎴戝笇鏈涙暟鎹簱鍒涘缓涓€涓复鏃惰〃锛屽畠灏嗙敤鎴峰姩鎬佽〃鍜屽叧娉ㄨ€呰〃涓殑鏁版嵁缁撳悎鍦ㄤ竴璧枫€?鏁版嵁灏嗘牴鎹弬鏁颁紶閫掔殑鏉′欢杩涜鍚堝苟銆?/p>

鎴戜娇鐢ㄧ殑鏉′欢琛ㄧず浜唂ollowers鍏崇郴琛ㄧ殑followed_id瀛楁蹇呴』绛変簬鐢ㄦ埛鍔ㄦ€佽〃鐨?code style="box-sizing: border-box; text-align: left; border: 1px solid rgb(223, 226, 229); border-radius: 3px; padding: 2px 4px 0px; font-size: 0.9rem; background-color: rgb(248, 248, 248);">user_id瀛楁銆?瑕佹墽琛屾鍚堝苟锛屾暟鎹簱灏嗕粠鐢ㄦ埛鍔ㄦ€佽〃锛坖oin鐨勫乏渚э級鑾峰彇姣忔潯璁板綍锛屽苟杩藉姞followers鍏崇郴琛紙join鐨勫彸渚э級涓殑鍖归厤鏉′欢鐨勬墍鏈夎褰曘€?濡傛灉followers鍏崇郴琛ㄤ腑鏈夊涓褰曠鍚堟潯浠讹紝閭ｄ箞鐢ㄦ埛鍔ㄦ€佹暟鎹灏嗛噸澶嶅嚭鐜般€?濡傛灉瀵逛簬涓€涓粰瀹氱殑鐢ㄦ埛鍔ㄦ€侊紝followers鍏崇郴琛ㄤ腑鍗存病鏈夊尮閰嶏紝閭ｄ箞璇ョ敤鎴峰姩鎬佺殑璁板綍涓嶄細鍑虹幇鍦╦oin鎿嶄綔鐨勭粨鏋滀腑銆?/p>

鍒╃敤鎴戜笂闈㈠畾涔夌殑绀轰緥鏁版嵁锛屾墽琛宩oin鎿嶄綔鐨勭粨鏋滃涓嬶細

idtextuser_idfollower_idfollowed_id
1post from susan212
2post from mary323
3post from david414
3post from david434

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杩囨护

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杩欐槸杩囨护閮ㄥ垎鐨勬煡璇㈣鍙ワ細

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1post from susan212
3post from david414

杩欐鏄垜鎯宠鐨勭粨鏋滐紒

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鎺掑簭

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