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111 lines
2.8 KiB
Ruby
111 lines
2.8 KiB
Ruby
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module HasCustomFields
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extend ActiveSupport::Concern
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included do
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has_many :_custom_fields, dependent: :destroy, :class_name => "#{name}CustomField"
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after_save :save_custom_fields
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# To avoid n+1 queries, we have this function to retrieve lots of custom fields in one
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# go and create a "sideloaded" version for easy querying by id.
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def self.custom_fields_for_ids(ids, whitelisted_fields)
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klass = "#{name}CustomField".constantize
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foreign_key = "#{name.underscore}_id".to_sym
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result = {}
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return result if whitelisted_fields.blank?
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klass.where(foreign_key => ids, :name => whitelisted_fields).pluck(foreign_key, :name, :value).each do |cf|
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result[cf[0]] ||= {}
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unload_field(result[cf[0]], cf[1], cf[2])
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end
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result
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end
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def self.unload_field(target, key, value)
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if target.has_key?(key)
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target[key] = [target[key]] if !target[key].is_a? Array
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target[key] << value
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else
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target[key] = value
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end
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end
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end
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def reload(options = nil)
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@custom_fields = nil
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@custom_fields_orig = nil
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super
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end
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def custom_fields
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@custom_fields ||= refresh_custom_fields_from_db.dup
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end
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def custom_fields=(data)
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custom_fields.replace(data)
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end
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def custom_fields_clean?
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# Check whether the cached version has been
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# changed on this model
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!@custom_fields || @custom_fields_orig == @custom_fields
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end
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protected
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def refresh_custom_fields_from_db
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target = Hash.new
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_custom_fields.pluck(:name,:value).each do |key, value|
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self.class.unload_field(target, key, value)
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end
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@custom_fields_orig = target
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@custom_fields = @custom_fields_orig.dup
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end
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def save_custom_fields
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if !custom_fields_clean?
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dup = @custom_fields.dup
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array_fields = {}
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_custom_fields.each do |f|
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if dup[f.name].is_a? Array
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# we need to collect Arrays fully before
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# we can compare them
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if !array_fields.has_key? f.name
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array_fields[f.name] = [f]
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else
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array_fields[f.name] << f
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end
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else
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if dup[f.name] != f.value
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f.destroy
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else
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dup.delete(f.name)
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end
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end
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end
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# let's iterate through our arrays and compare them
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array_fields.each do |field_name, fields|
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if fields.length == dup[field_name].length &&
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fields.map{|f| f.value} == dup[field_name]
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dup.delete(f.name)
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else
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fields.each{|f| f.destroy }
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end
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end
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dup.each do |k,v|
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if v.is_a? Array
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v.each {|subv| _custom_fields.create(name: k, value: subv)}
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else
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_custom_fields.create(name: k, value: v)
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end
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end
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refresh_custom_fields_from_db
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end
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end
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end
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