before_filter, after_filter, around_filter, prepend_before_filter, prepend_after_filter, prepend_filter の順番整理メモ
before_filter
before_filter :b1, :b2 # b1 --> b2 --> action
before_filter :b1 before_filter :b2 # b1 --> b2 --> action
before_filter + prepend_before_filter
before_filter :b1, :b2 prepend_before_filter :b3 # b3 --> b1 --> b2 --> action
before_filter :b1, :b2 prepend_before_filter :b3 prepend_before_filter :b4 # b4 --> b3 --> b1 --> b2 --> action
before_filter :b1, :b2 prepend_before_filter :b3, :b4 # b3 --> b4 --> b1 --> b2 --> action
別々に prepend_before_filter を宣言したときと、
カンマ区切りで並べたときの順序が同じにならないのは紛らわしいなぁ。。
after_filter
before_filter と同じ
after_filter :a1, :a2 # action --> a1 --> a2
after_filter :a1 after_filter :a2 # action --> a1 --> a2
after_filter + prepend_after_filter
after_filter :a1, :a2 prepend_after_filter :a3 # action --> a3 --> a1 --> a2
after_filter :a1, :a2 prepend_after_filter :a3 prepend_after_filter :a4 # action --> a4 --> a3 --> a1 --> a2
after_filter :a1, :a2 prepend_after_filter :a3, :a4 # action --> a3 --> a4 --> a1 --> a2
around_filter
before_filter, after_filter と同じ
around_filter :ar1, :ar2 # ar1(before) --> ar2(before) --> # action --> # ar2(after) --> ar1(after)
around_filter :ar1 around_filter :ar2 # ar1(before) --> ar2(before) --> # action --> # ar2(after) --> ar1(after)
around_filter + prepend_around_filter
around_filter :ar1, :ar2 prepend_around_filter :ar3 # ar3(before) --> ar1(before) --> ar2(before) --> # action --> # ar2(after) --> ar1(after) --> ar3(after)
around_filter :ar1, :ar2 prepend_around_filter :ar3 prepend_around_filter :ar4 # ar4(before) --> ar3(before) --> ar1(before) --> ar2(before) --> # action --> # ar2(after) --> ar1(after) --> ar3(after) --> ar4(after)
around_filter :ar1, :ar2 prepend_around_filter :ar3, ar4 # ar3(before) --> ar4(before) --> ar1(before) --> ar2(before) --> # action --> # ar2(after) --> ar1(after) --> ar4(after) --> ar3(after)
before_filter + around_filter
before_filter :b1 around_filter :ar1 # b1 --> ar1(before) --> action --> ar1(after)
before_filter :b1 around_filter :ar1 before_filter :b2 # b1 --> ar1(before) --> b2 --> action --> ar1(after)
before_filter :b1 around_filter :ar1 before_filter :b2 around_filter :ar2 # b1 --> ar1(before) --> b2 --> ar2(before) --> # action --> ar2(after) --> ar1(after)
逆
around_filter :ar1 before_filter :b1 # ar1(before) --> b1 --> action --> ar1(after)
around_filter :ar1 before_filter :b1 around_filter :ar2 before_filter :b2 # ar1(before) --> b1 --> ar2(before) --> b2 --> # action --> ar2(after) --> ar1(after)
prepend_before_filter + around_filter
around_filter :ar1 prepend_before_filter :b1 # b1 --> ar1(before) --> action --> ar1(after)
around_filter :ar1 prepend_before_filter :b1 prepend_before_filter :b2 # b2 --> b1 --> ar1(before) --> action --> ar1(after)
around_filter :ar1 prepend_before_filter :b1, :b2 # b1 --> b2 --> ar1(before) --> action --> ar1(after)
around_filter :ar1 prepend_before_filter :b1 around_filter :ar2 prepend_before_filter :b2 # b2 --> b1 --> ar1(before) --> ar2(before) --> # action --> ar2(after) --> ar1(after)
before_filter + prepend_around_filter
before_filter :b1 prepend_around_filter :ar1 # ar1(before) --> b1 --> action --> ar1(after)
before_filter :b1 prepend_around_filter :ar1 prepend_around_filter :ar2 # ar2(before) --> ar1(before) --> b1 --> action --> ar1(after) --> ar2(after)
before_filter :b1 prepend_around_filter :ar1, :ar2 # ar1(before) --> ar2(before) --> b1 --> action --> ar2(after) --> ar1(after)
before_filter :b1 prepend_around_filter :ar1 before_filter :b1 prepend_around_filter :ar2 # ar2(before) --> ar1(before) --> b1 --> b2 --> # action --> ar1(after) --> ar2(after)
prepend_before_filter + prepend_around_filter
prepend_before_filter :b1 prepend_around_filter :ar1 # ar1(before) --> b1 --> action --> ar1(after)
prepend_around_filter :ar1 prepend_before_filter :b1 # b1 --> ar1(before) --> action --> ar1(after)
after_filter + around_filter
after_filter :a1 around_filter :ar1 # ar1(before) --> action --> ar1(after) --> a1
a1 が ar1のafter より後にまわされる。。
around_filter :ar1 after_filter :a1 # ar1(before) --> action --> ar1(after) --> a1
逆は当然か
after_filter :a1 around_filter :ar1 after_filter :a2 # ar1(before) --> action --> ar1(after) --> a1 --> a2
after_filter :a1 around_filter :ar1 after_filter :a2 around_filter :ar2 # ar1(before) --> ar2(before) --> action --> # ar2(after) --> ar1(after) --> a1 --> a2
やっぱ、気持ち悪いなぁ。。
prepend_after_filter + around_filter
prepend_after_filter :a1 around_filter :ar1 # ar1(before) --> action --> ar1(after) --> a1
prepend でも無理。aroundのafterより優先的にはできない。
around_filter :ar1 prepend_after_filter :a1 # ar1(before) --> action --> ar1(after) --> a1
まぁ無理ですよね。
prepend_after_filter :a1 around_filter :ar1 prepend_after_filter :a2 around_filter :ar2 # ar1(before) --> ar2(before) --> action --> # ar2(after) --> ar1(after) --> a2 --> a1
after_filter 同士内でのみ prepend が効いてるが、around_filter には効かない
after_filter + prepend_after_filter
after_filter :a1 prepend_around_filter :ar1 after_filter :a2 prepend_around_filter :ar2 # ar2(before) --> ar1(before) --> action --> # ar1(after) --> ar2(after) --> a1 --> a2
そもそもprependしなくても、after_filterはaroundより優先的には実行されてないから、
当然こうなりますよね。
prepend_after_filter * prepend_around_filter
prepend_after_filter :a1 prepend_around_filter :ar1 prepend_after_filter :a2 prepend_around_filter :ar2 # ar2(before) --> ar1(before) --> action --> # ar1(after) --> ar2(after) --> a2 --> a1
ふむ
まとめ
before と around は自然な挙動だけど、after と around はちょっと気持ち悪い（afterをaroundのafterより先に実行させることができない）
