Refactor scoping and make default_scopes thread-safe#683
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We've used `active_scopes` and `default_scopes` to store scopes in the current
context. However, it has been thread-unsafe because we clear `default_scopes`
to unscope.
Moreover, `default_scopes` is the master data of default scopes, and we shouldn't
clear it.
Therefore, this commit introduces `current_context` as a thread local variable to
store the current scoped context in it:
- When `unscoped { ... }` is called, `current_context` stores a plain query object
- When `with_scope(...) { ... }` is called, `current_context` stores a query object
scoped with `default_scopes` and the method's arguments
- Otherwise, it stores nothing - nil, so we need to build a new query with
`default_scopes`
`current_context` includes active scopes naturally, so this commit removes the method.
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We've used
active_scopesanddefault_scopesto store scopes in the current context. However, it has been thread-unsafe because we cleardefault_scopesto unscope.Moreover,
default_scopesis the master data of default scopes, and we shouldn't clear it.Therefore, this commit introduces
current_contextas a thread local variable to store the current scoped context in it:unscoped { ... }is called,current_contextstores a plain query objectwith_scope(...) { ... }is called,current_contextstores a query object scoped withdefault_scopesand the method's argumentsdefault_scopesThen, we don't have to clear
default_scopesto unscope.current_contextincludes active scopes naturally, so this commit removes the method.