workshop - explore_activerecord.pdf

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1、Row=>RubyObjectExploreActiveRecordSourceCodeMe陈恺已婚已育的程序员WorkatSmartLionTeamLead•@_kaichenatTwitter•@kaichenatGithub•kai@thekaiway.comAgendaTalkischeap,showmethecode.-LinusTorvaldsTellyou(我跟你讲啊)•ThinkMore•ShowsomeRespect•EnglishReadingfromNiceDocComment•HelpyoudebugManner•Giveyou

2、aOverviewFirst•Showyouthewayofthinking•ShowyoutheSkills•GuideyoudigdowncodeContent•Database•Rails•TraceRubyCode•ActiveRecord•Sample•Q&ATarget•JuniorRailsDevelopers•2+yearsGoal•LearnInternalofActiveRecord•InterestaboutComputerScienceFindOutTogetherReadandMakeFunTogether,andIdon’t

3、haveideahowlongofthisworkshopDatabaseDatabase•Relation•SQL•RuntimeModel•IOModel/StorageRelationalRelationalRelationalSQLSQL•SELECT*FROMusersWHEREusers.id=1limit1;•INSERTINTOusers(name,email)VALUES(‘kai’,‘kai@thekaiway.com’);•UPDATEusersSETage=age+1;•DETELEFROMusersWHEREemail=‘ka

4、i@thekaiway.com’;Runtime•Serverless•Multi-Threads•Multi-ProcessesMemoryManagement&I/O•Memory•SavetoDiskRailsRubyonRailsFullStackWebFrameworkRailsActionMailerActionViewActiveModelActionPackActiveSupportActiveRecordRailsActiveRecordActiveModelActionMailerActionPackActionViewSprock

5、etsActiveSupportFollowRailsChanges•https://github.com/rails/rails•USINGGit!!!TraceRubyCodeTraceRubyCode•SearchSourceCode•DebuginRuntime•ProofinSample/ProductionProjectSearchingSourceCode•Grep-http://www.gnu.org/software/grep/•Ack-https://github.com/petdance/ack2•Ag-https://githu

6、b.com/ggreer/the_silver_searcher•Pt-https://github.com/monochromegane/the_platinum_searcherRuntimeDebugging•puts/inspect•pry•RaiseErrorSample-LiveCodingNewRulesNomoremagicLessDynamicMethodDefineNocodefasterthancode.–JeffAtwoodActiveRecordThePatternFromMartinFowler’s「PatternsofEnt

7、erpriseApplicationArchitecture」ActiveRecordPattern•DatabaseRowpresentsasanRubyObject•ClassmapstoaTable•Instancemapstoarow•CRUDonanInstanceperformSQLQueryFeaturesMigrationColumnValueTypecastingAssociationIdentityMapFixturesPrepareStatementSchemaDumpConnectionPoolQueryCacheConnect

8、ionReaperSessionStoreTimestampDDLGenerationSTIT