ruby on rails - Q&A. Trailbalzer Testing - Implications of contract method -


the following q&a based on examples given in trailblazer book pp. ~50-60 adapted specific requirements. can think of arinvoice , ar_invoice thing , thing general drift if following in book.

my operation.rb file was:

class arinvoice < gltransaction   class create <   trailblazer::operation      include( model )     model( arinvoice, :create )      contract()       property( :invoice_number )       property( :currency_code )       property( :forex_rate )       property( :gl_account_id )        validates( :invoice_number, :presence => true )       validates( :currency_code, :presence => true )     end      def process( params )       @model = arinvoice.new  # have use instance variable here       validate( params[ :ar_invoice ], @model ) |f|         f.save       end     end   end end

i adapted test trailblazer book:

it("inserts valid invoice")   test_time = time.now   puts(test_time)   ar_invoice = arinvoice::create.(     :ar_invoice => {       :invoice_number => 101,       :gl_account_id => 1,       :effective_from => test_time.to_s     }   ).model    ar_invoice.persisted?.must_equal(true)   ar_invoice.invoice_number.must_equal(101)   ar_invoice.transaction_type.must_equal('in')   ar_invoice.effective_from.must_equal(test_time)   ar_invoice.superseded_after.must_equal(nil) end

and got error:

ar_invoice crud create#test_0001_inserts valid invoice: \ activerecord::statementinvalid: sqlite3::constraintexception: \ gl_transactions.effective_from may not null: \ insert "gl_transactions" . . .

but see this:

# running: 2016-02-08 11:24:35 -0500 e

so, test_time value set. why not getting effective_from attribute?

the answer give below.

the problem did not grasp significance of contract do/end block used in trailblazer (tbr). way read book contract concerned form. experience ror led me map word form word view. mistake. 1 might trip else well.

the correct contract block contains missing attribute: effective_from

contract()   property( :invoice_number )   property( :currency_code )   property( :forex_rate )   property( :gl_account_id )    property( :effective_from )    validates( :invoice_number, :presence => true )   validates( :currency_code, :presence => true ) end

for now, helps me if map word form params[ :model ]. because attributes looked in params[ :model ] hash when process method called limited attributes explicitly listed in contract do/end block; which why strong parameters unneeded when using tbr.

note original test still fails because currency_code validation not met. intentional @ time test written.


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