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module CanCan
module ModelAdapters
class ActiveRecordAdapter < AbstractAdapter
def self.for_class?(model_class)
model_class <= ActiveRecord::Base
end
def self.override_condition_matching?(subject, name, value)
name.kind_of?(MetaWhere::Column) if defined? MetaWhere
end
def self.matches_condition?(subject, name, value)
subject_value = subject.send(name.column)
if name.method.to_s.ends_with? "_any"
value.any? { |v| meta_where_match? subject_value, name.method.to_s.sub("_any", ""), v }
elsif name.method.to_s.ends_with? "_all"
value.all? { |v| meta_where_match? subject_value, name.method.to_s.sub("_all", ""), v }
else
meta_where_match? subject_value, name.method, value
end
end
def self.meta_where_match?(subject_value, method, value)
case method.to_sym
when :eq then subject_value == value
when :not_eq then subject_value != value
when :in then value.include?(subject_value)
when :not_in then !value.include?(subject_value)
when :lt then subject_value < value
when :lteq then subject_value <= value
when :gt then subject_value > value
when :gteq then subject_value >= value
when :matches then subject_value =~ Regexp.new("^" + Regexp.escape(value).gsub("%", ".*") + "$", true)
when :does_not_match then !meta_where_match?(subject_value, :matches, value)
else raise NotImplemented, "The #{method} MetaWhere condition is not supported."
end
end
# Returns conditions intended to be used inside a database query. Normally you will not call this
# method directly, but instead go through ModelAdditions#accessible_by.
#
# If there is only one "can" definition, a hash of conditions will be returned matching the one defined.
#
# can :manage, User, :id => 1
# query(:manage, User).conditions # => { :id => 1 }
#
# If there are multiple "can" definitions, a SQL string will be returned to handle complex cases.
#
# can :manage, User, :id => 1
# can :manage, User, :manager_id => 1
# cannot :manage, User, :self_managed => true
# query(:manage, User).conditions # => "not (self_managed = 't') AND ((manager_id = 1) OR (id = 1))"
#
def conditions
if @rules.size == 1 && @rules.first.base_behavior
# Return the conditions directly if there's just one definition
tableized_conditions(@rules.first.conditions).dup
else
@rules.reverse.inject(false_sql) do |sql, rule|
merge_conditions(sql, tableized_conditions(rule.conditions).dup, rule.base_behavior)
end
end
end
def tableized_conditions(conditions, model_class = @model_class)
return conditions unless conditions.kind_of? Hash
conditions.inject({}) do |result_hash, (name, value)|
if value.kind_of? Hash
value = value.dup
association_class = model_class.reflect_on_association(name).class_name.constantize
nested = value.inject({}) do |nested,(k,v)|
if v.kind_of? Hash
value.delete(k)
nested[k] = v
else
name = model_class.reflect_on_association(name).table_name.to_sym
result_hash[name] = value
end
nested
end
result_hash.merge!(tableized_conditions(nested,association_class))
else
result_hash[name] = value
end
result_hash
end
end
# Returns the associations used in conditions for the :joins option of a search.
# See ModelAdditions#accessible_by
def joins
joins_hash = {}
@rules.each do |rule|
merge_joins(joins_hash, rule.associations_hash)
end
clean_joins(joins_hash) unless joins_hash.empty?
end
def database_records
if override_scope
@model_class.scoped.merge(override_scope)
elsif @model_class.respond_to?(:where) && @model_class.respond_to?(:joins)
mergeable_conditions = @rules.select {|rule| rule.unmergeable? }.blank?
if mergeable_conditions
@model_class.where(conditions).joins(joins)
else
@model_class.where(*(@rules.map(&:conditions))).joins(joins)
end
else
@model_class.scoped(:conditions => conditions, :joins => joins)
end
end
private
def override_scope
conditions = @rules.map(&:conditions).compact
if defined?(ActiveRecord::Relation) && conditions.any? { |c| c.kind_of?(ActiveRecord::Relation) }
if conditions.size == 1
conditions.first
else
rule = @rules.detect { |rule| rule.conditions.kind_of?(ActiveRecord::Relation) }
raise Error, "Unable to merge an Active Record scope with other conditions. Instead use a hash or SQL for #{rule.actions.first} #{rule.subjects.first} ability."
end
end
end
def merge_conditions(sql, conditions_hash, behavior)
if conditions_hash.blank?
behavior ? true_sql : false_sql
else
conditions = sanitize_sql(conditions_hash)
case sql
when true_sql
behavior ? true_sql : "not (#{conditions})"
when false_sql
behavior ? conditions : false_sql
else
behavior ? "(#{conditions}) OR (#{sql})" : "not (#{conditions}) AND (#{sql})"
end
end
end
def false_sql
sanitize_sql(['?=?', true, false])
end
def true_sql
sanitize_sql(['?=?', true, true])
end
def sanitize_sql(conditions)
@model_class.send(:sanitize_sql, conditions)
end
# Takes two hashes and does a deep merge.
def merge_joins(base, add)
add.each do |name, nested|
if base[name].is_a?(Hash)
merge_joins(base[name], nested) unless nested.empty?
else
base[name] = nested
end
end
end
# Removes empty hashes and moves everything into arrays.
def clean_joins(joins_hash)
joins = []
joins_hash.each do |name, nested|
joins << (nested.empty? ? name : {name => clean_joins(nested)})
end
joins
end
end
end
end
ActiveRecord::Base.class_eval do
include CanCan::ModelAdditions
end
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