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module Lev
# A utility method for calling handlers from controllers. To use,
# include this in your relevant controllers (or in your ApplicationController),
# e.g.:
#
# class ApplicationController
# include Lev::HandleWith
# ...
# end
#
# Then, call it from your various controller actions, e.g.:
#
# handle_with(MyFormHandler,
# params: params,
# success: lambda { redirect_to 'show', notice: 'Success!'},
# failure: lambda { render 'new', alert: 'Error' })
#
# handle_with takes care of calling the handler and populates
# a @handler_result object with the return value from the handler
#
# The 'success' and 'failure' lambdas are called if there aren't or are errors,
# respectively. Alternatively, if you supply a 'complete' lambda, that lambda
# will be called regardless of whether there are any errors. Inside these lambdas
# (and inside the views they connect to), there will be the @handler_outcome
# variable containing the errors and results from the handler.
#
# Specifying 'params' is optional. If you don't specify it, HandleWith will
# use the entire params hash from the request.
#
module HandleWith
def handle_with(handler, options={})
success_action = options.delete(:success)
failure_action = options.delete(:failure)
complete_action = options.delete(:complete)
complete_action ||= lambda { render } if !(success_action || failure_action)
options[:params] ||= params
options[:request] ||= request
options[:caller] ||= current_user
@handler_result = handler.handle(options)
if complete_action.nil?
@handler_result.errors.empty? ?
success_action.call :
failure_action.call
else
complete_action.call
end
end
end
end
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34 entries across 34 versions & 1 rubygems