eager loading - Web Api Returning Json - [System.NotSupportedException] Specified method is not supported. (Sybase Ase) -


i'm using web api entity framework 4.2 , sybase ase connector.

this working without issues returning json, until tried add new table. 

  return db.car              .include("tires")              .include("tires.hub_caps")              .include("tires.hub_caps.colors")              .include("tires.hub_caps.sizes")              .include("tires.hub_caps.sizes.units")              .where(c => c.tires == 13);

the above works without issues if following line removed: 

.include("tires.hub_caps.colors")

however, when line included, given error:

""an error occurred while preparing command definition. see inner exception details."

the inner exception reads: "innerexception = {"specified method not supported."}" "source = sybase.adonet4.aseclient"

the following results in error:

  list<car> cars = db.car.asnotracking()              .include("tires")              .include("tires.hub_caps")              .include("tires.hub_caps.colors")              .include("tires.hub_caps.sizes")              .include("tires.hub_caps.sizes.units")              .where(c => c.tires == 13).tolist();

the error follows:

an exception of type 'system.data.entitycommandcompilationexception' occurred in system.data.entity.dll not handled in user code  additional information: error occurred while preparing command definition. see inner exception details.

inner exception: "specified method not supported."

this points fault with sybase ase data connector.

i using data annotations on tables control fields returned. on colors table, have tried following annotations limit properties returned key:

[jsonignore]  [ignoredatamember]

any ideas might causing issue?

alternatively, if keep colors in , remove, 

 .include("tires.hub_caps.sizes")  .include("tires.hub_caps.sizes.units")

then works also. seems sybase ase connector not support cases when include statement forks 1 object in 2 directions. there way round this? same issue occurs sybase ase , progress data connector.

the issue not occur in standard asp.net mvc controller class - problem serializing 2 1 many relationships on single table json.

this issue still occurs if lazy loading turned on.

it seems me bug sybase ase, none of connectors able solve.


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