Video: Rails ActiveRecord yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Rails Active Cov Ntaub Ntawv yog Object/Relational Mapping (ORM) txheej muab nrog Rails . Nws zoo ua raws li tus qauv ORM tus qauv, uas yog raws li hauv qab no - daim duab qhia chaw rau cov chav kawm, kab ntawv qhia rau cov khoom thiab. kem daim ntawv qhia rau khoom yam ntxwv.
Raws li txoj cai, Rails qauv yog dab tsi?
A Rails Model yog ib chav Ruby uas tuaj yeem ntxiv cov ntaub ntawv khaws cia (xav txog tag nrho cov kab hauv Excel lub rooj), nrhiav cov ntaub ntawv tshwj xeeb uas koj tab tom nrhiav, hloov kho cov ntaub ntawv, lossis tshem tawm cov ntaub ntawv. Cov kev ua haujlwm zoo li no raug xa mus los ntawm lub npe CRUD--Tsim, Tshem Tawm, Hloov Kho, Ua kom puas.
Tsis tas li ntawd, Rails ApplicationRecord yog dab tsi? Rails 5 tus Daim ntawv thov yog qhov chaw muab generic qauv logic. Txij li thaum Rails 5, domain qauv tau txais los ntawm Daim ntawv thov los ntawm lub neej ntawd. Qhov no yog qhov chaw tso cai uas yuav tsum muaj nyob rau hauv tag nrho koj daim ntawv thov tus qauv. Tsis muaj laj thawj rau liab-patch ActiveRecord :: Pib thaum ua raws li qhov kev coj ua.
Tom qab ntawd, lo lus nug yog, dab tsi yog ActiveRecord hauv Ruby ntawm Rails?
ActiveRecord yog ib lub pov haum uas yog ib feem ntawm Ruby on Rails . Nws yog ORM, piv txwv li lub tsev qiv ntawv uas qhia peb cov khoom rau cov rooj. Hauv lwm lo lus, nws yog Ruby lub tsev qiv ntawv uas tso cai rau peb siv Ruby cov chav kawm txhawm rau nkag mus rau peb cov ntaub ntawv khaws cia hauv RDBMS, zoo li MySQL lossis PostgreSQL.
Yuav ua li cas yog ib tug active cov ntaub ntawv ua hauj lwm?
Nws yeej txhais tau tias Active Cov Ntaub Ntawv siv cov ntaub ntawv uas tau muab khaws cia rau hauv lub rooj database siv kab thiab kab, uas yuav tsum tau hloov kho lossis rov qab los ntawm kev sau SQL nqe lus (yog tias koj siv SQL database), thiab nws cia koj cuam tshuam nrog cov ntaub ntawv zoo li nws yog ib txwm muaj. Ruby khoom.
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Tus qauv hauv Rails yog dab tsi?
A Rails Model yog Ruby chav kawm uas tuaj yeem ntxiv cov ntaub ntawv khaws cia (xav txog tag nrho cov kab hauv Excel lub rooj), nrhiav cov ntaub ntawv tshwj xeeb uas koj tab tom nrhiav, hloov kho cov ntaub ntawv, lossis tshem tawm. Rails muaj cov qauv tsim hluav taws xob, uas koj tuaj yeem siv los ntawm koj cov kab hais kom ua, tsuav yog koj nyob hauv Rails appalready
Tam sim no version ntawm Rails yog dab tsi?
Keeb Kwm Version Hnub Tim 5.1 Lub Tsib Hlis 10, 2017 5.2 Lub Plaub Hlis 9, 2018 6.0 Lub Yim Hli 16, 2019 Cov Lus Nug Dhau Los, tseem khaws Cov Ntawv Tshaj Tawm Yav Tom Ntej