Import/Export course/unit/... about geli HOT 6 CLOSED

When exporting, this happens (for the shown test course):

{"name":"TypeError","message":"Cannot read property 'exportJSON' of null","stack":"TypeError: Cannot read property 'exportJSON' of null\n at Unit_1.Unit.findById.then (/usr/src/app/models/Lecture.js:61:29)\n at <anonymous>\n at process._tickDomainCallback (internal/process/next_tick.js:228:7)"}

When duplicating, this happens:

{"name":"InternalServerError","message":"Failed to duplicate course","stack":"Error\n at InternalServerError.HttpError [as constructor] (/usr/src/app/node_modules/routing-controllers/http-error/HttpError.js:27:23)\n at new InternalServerError (/usr/src/app/node_modules/routing-controllers/http-error/InternalServerError.js:20:28)\n at DuplicationController.<anonymous> (/usr/src/app/controllers/DuplicationController.js:39:34)\n at Generator.throw (<anonymous>)\n at rejected (/usr/src/app/controllers/DuplicationController.js:17:65)\n at <anonymous>\n at process._tickDomainCallback (internal/process/next_tick.js:228:7)\nCaused by: Cannot read property 'exportJSON' of null\nTypeError: Cannot read property 'exportJSON' of null\n at Unit_1.Unit.findById.then (/usr/src/app/models/Lecture.js:61:29)\n at <anonymous>\n at process._tickDomainCallback (internal/process/next_tick.js:228:7)"}

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okay, just figured out the reason for this error. this Course contains some lectures which didn't got deleted cleanly.

Should be the same error for #183

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Added criteria in the session on 2017-11-30:

• Remove enroll key, whitelist and "active" flag in the export

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Closed by #419

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When I try to imort the course https://staging.geli.fbi.h-da.de/course/59fa100662fa9c00060bb3d2 (which I previously exported to the following JSON file, I get an error).

Dritter-Kurs-von-David.json.log

{"name":"InternalServerError","message":"Failed to import course","stack":"Error\n at InternalServerError.HttpError [as constructor] (/usr/src/app/node_modules/routing-controllers/http-error/HttpError.js:27:23)\n at new InternalServerError (/usr/src/app/node_modules/routing-controllers/http-error/InternalServerError.js:20:28)\n at Object.<anonymous> (/usr/src/app/models/Course.js:152:30)\n at Generator.throw (<anonymous>)\n at rejected (/usr/src/app/models/Course.js:5:65)\n at <anonymous>\n at process._tickDomainCallback (internal/process/next_tick.js:228:7)\nCaused by: Failed to import lecture\nError\n at InternalServerError.HttpError [as constructor] (/usr/src/app/node_modules/routing-controllers/http-error/HttpError.js:27:23)\n at new InternalServerError (/usr/src/app/node_modules/routing-controllers/http-error/InternalServerError.js:20:28)\n at Object.<anonymous> (/usr/src/app/models/Lecture.js:92:30)\n at Generator.throw (<anonymous>)\n at rejected (/usr/src/app/models/Lecture.js:5:65)\n at <anonymous>\n at process._tickDomainCallback (internal/process/next_tick.js:228:7)\nCaused by: Failed to import unit of type file\nError\n at InternalServerError.HttpError [as constructor] (/usr/src/app/node_modules/routing-controllers/http-error/HttpError.js:27:23)\n at new InternalServerError (/usr/src/app/node_modules/routing-controllers/http-error/InternalServerError.js:20:28)\n at Object.<anonymous> (/usr/src/app/models/units/Unit.js:82:30)\n at Generator.throw (<anonymous>)\n at rejected (/usr/src/app/models/units/Unit.js:5:65)\n at <anonymous>\n at process._tickDomainCallback (internal/process/next_tick.js:228:7)\nCaused by: file validation failed: fileUnitType: Path fileUnitTypeis required.\nValidationError: file validation failed: fileUnitType: PathfileUnitType is required.\n at new ValidationError (/usr/src/app/node_modules/mongoose/lib/error/validation.js:28:11)\n at model.Document.invalidate (/usr/src/app/node_modules/mongoose/lib/document.js:1675:32)\n at /usr/src/app/node_modules/mongoose/lib/document.js:1547:17\n at validate (/usr/src/app/node_modules/mongoose/lib/schematype.js:784:7)\n at /usr/src/app/node_modules/mongoose/lib/schematype.js:829:11\n at Array.forEach (<anonymous>)\n at SchemaString.SchemaType.doValidate (/usr/src/app/node_modules/mongoose/lib/schematype.js:789:19)\n at /usr/src/app/node_modules/mongoose/lib/document.js:1545:9\n at _combinedTickCallback (internal/process/next_tick.js:131:7)\n at process._tickDomainCallback (internal/process/next_tick.js:218:9)"}

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Its the bsontype= "ObjectId" which leads to failures. This contains all Courses which have fileunits and all courses that contain references in the Mediamanager. Also, some Courses have leftover References in the "media" section (on export in the json) but none visible in the GUI.
Also, the concept of just referencing Media files seems a bit problmatic in some aspects. Maybe we shouldnt be able to export media-units for now. Or on Import, we should just create "empty" file units with description and the name as placeholder.

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