class BabySqueel::Resolver
Public Class Methods
new(table, strategies)
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# File lib/baby_squeel/resolver.rb, line 3 def initialize(table, strategies) @table = table @strategies = strategies end
Public Instance Methods
resolve(name, *args, &block)
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Attempt to determine the intent of the method_missing. If this method returns nil, that means one of two things:
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The argument signature is invalid.
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The name of the method called is not valid (ex. invalid column name)
# File lib/baby_squeel/resolver.rb, line 13 def resolve(name, *args, &block) strategy = @strategies.find do |strategy| valid?(strategy, name, *args, &block) end build(strategy, name, *args, &block) end
resolve!(name, *args, &block)
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Try to resolve the method_missing. If we fail to resolve, there are two outcomes:
If any of the configured strategies accept argument signature provided, raise an error. This means we failed to resolve the name. (ex. invalid column name)
Otherwise, a nil return valid indicates that argument signature was not valid for any of the configured strategies. This case should be treated as a NoMethodError.
# File lib/baby_squeel/resolver.rb, line 31 def resolve!(name, *args, &block) if resolution = resolve(name, *args, &block) return resolution end if compatible_arguments?(*args, &block) raise NotFoundError.new(@table._scope.model_name, name, @strategies) end return nil end
resolves?(name)
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Used to determine if a table can respond_to? a method.
# File lib/baby_squeel/resolver.rb, line 44 def resolves?(name) @strategies.any? do |strategy| valid_name? strategy, name end end
Private Instance Methods
build(strategy, name, *args)
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# File lib/baby_squeel/resolver.rb, line 52 def build(strategy, name, *args) case strategy when :function @table.func(name, *args) when :association @table.association(name) when :column, :attribute @table[name] end end
compatible_arguments?(*args, &block)
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# File lib/baby_squeel/resolver.rb, line 90 def compatible_arguments?(*args, &block) @strategies.any? do |strategy| valid_arguments?(strategy, *args, &block) end end
valid?(strategy, name, *args, &block)
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# File lib/baby_squeel/resolver.rb, line 63 def valid?(strategy, name, *args, &block) valid_arguments?(strategy, *args, &block) && valid_name?(strategy, name) end
valid_arguments?(strategy, *args)
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# File lib/baby_squeel/resolver.rb, line 79 def valid_arguments?(strategy, *args) return false if block_given? case strategy when :function !args.empty? when :column, :attribute, :association args.empty? end end
valid_name?(strategy, name)
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# File lib/baby_squeel/resolver.rb, line 68 def valid_name?(strategy, name) case strategy when :column @table._scope.column_names.include?(name.to_s) when :association !@table._scope.reflect_on_association(name).nil? when :function, :attribute true end end