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# This module exists because call order on the hooks provided by Her is important in some cases.
# For example in Rooftop::FieldAliases we are aliasing the content of a field, which might need to
# have been coerced first. So we control the order by writing (in a known order) to @hook_calls, and
# then iterating over them.
module Rooftop
module HookCalls
def self.included(base)
base.extend ClassMethods
# Iterate over an instance var which is a hash of types of hook, and blocks to call
# like this {after_find: [->{something}, ->{something}]}
base.instance_variable_set(:"@hook_calls", base.instance_variable_get(:"@hook_calls") || {})
end
module ClassMethods
# Add something to the list of hook calls, for a particular hook. This is called in other mixins where something is being added to a hook (probably :after_find). For example Rooftop::FieldAliases and Rooftop::FieldCoercions
def add_to_hook(hook, block)
# get existing hook calls
hook_calls = instance_variable_get(:"@hook_calls")
# add new one for the appropriate hook
if hook_calls[hook].is_a?(Array)
hook_calls[hook] << block
else
hook_calls[hook] = [block]
end
instance_variable_set(:"@hook_calls",hook_calls)
end
# A method to call the hooks. This iterates over each of the types of hook (:after_find,
# :before_save etc, identified here: https://github.com/remiprev/her#callbacks) and sets up
# the actual hook. All this is worth it to control order.
def setup_hooks!
instance_variable_get(:"@hook_calls").each do |type, calls|
calls.each do |call|
self.send(type, call)
end
end
end
end
end
end
Version data entries
9 entries across 9 versions & 1 rubygems