c# - Is it possible to have multiple controllers for a single entity type? -

-

i have entity framework model. let's have object foo , object bar. related, foo has navigation property bar, , vice versa.

now, odata endpoint, i'd have 2 collections available foo, instance declared so:

var builder = new odataconventionmodelbuilder { namespace = "test" }; builder.entityset<foo>("fools"); builder.entityset<foo>("footballs"); builder.entityset<bar>("bars");

the idea here access fools go through foolscontroller , access footballs go through footballscontroller, return different sets of data in each endpoint.

trying this, however, causes following notsupportedexception error message:

cannot automatically bind navigation property 'foothing' on entity type 'foo' entity set or singleton 'bars' because there 2 or more matching target entity sets or singletons. matching entity sets or singletons are: fools, footballs.

i sort of understand issue, if know fact footballs have bars, there way me system understand bars have footballs?

the answer absolutely yes. there many fluent apis can call set binding manually, suppress convention binding. example:

hasmanybinding hasrequiredbinding hasoptionalbinding hassingletonbinding ...

based on information, can call following make binding manually:

builder.entityset<bar>("bars").hasrequiredbinding(b => b.foothing, "fools");

i create simple foo , bar class model test. below result shows metadata:

<?xml version="1.0" encoding="utf-8"?> <edmx:edmx version="4.0" xmlns:edmx="http://docs.oasis-open.org/odata/ns/edmx">   <edmx:dataservices>     <schema namespace="webapitest" xmlns="http://docs.oasis-open.org/odata/ns/ed m">       <entitytype name="foo">         <key>           <propertyref name="id" />         </key>         <property name="id" type="edm.int32" nullable="false" />       </entitytype>       <entitytype name="bar">         <key>           <propertyref name="id" />         </key>         <property name="id" type="edm.int32" nullable="false" />         <navigationproperty name="foothing" type="webapitest.foo" nullable="fals e" />       </entitytype>     </schema>     <schema namespace="test" xmlns="http://docs.oasis-open.org/odata/ns/edm">       <entitycontainer name="container">         <entityset name="fools" entitytype="webapitest.foo" />         <entityset name="footballs" entitytype="webapitest.foo" />         <entityset name="bars" entitytype="webapitest.bar">           <navigationpropertybinding path="foothing" target="fools" />         </entityset>       </entitycontainer>     </schema>   </edmx:dataservices> </edmx:edmx>

as can see, "hasrequiredbinding" can make navigation property non-nullable, while, "hasoptionbinding" can make nullable.

hope can help. thanks.


Comments

Post a Comment

Popular posts from this blog

python - pip install -U PySide error -

-
does know how avoid following error when running pip install -u pyside per official website instructions here: https://pypi.python.org/pypi/pyside/#installing-pyside-on-a-mac-os-x-system note have done brew install qt successfully. you using pip version 7.0.3, version 7.1.2 available. should consider upgrading via 'pip install --upgrade pip' command. collecting pyside using cached pyside-1.2.4.tar.gz installing collected packages: pyside running setup.py install pyside complete output command /applications/anaconda/bin/python -c "import setuptools, tokenize;__file__='/private/var/folders/dy/ttgqhqqx3g9bsbsnqnxsk2z80000gq/t/pip-build-cpxemt/pyside/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/dy/ttgqhqqx3g9bsbsnqnxsk2z80000gq/t/pip-0r7hri-record/install-record.txt --single-version-externally-managed --compile: ...
Read more

arrays - C++ error: a brace-enclosed initializer is not allowed here before ‘{’ token -

-
simple question: i'm trying initialize array within c++ class declaration: using namespace std; #include <string> class myclass{ public: string myarray[] = {"a","b","c"}; }; and i'm getting error: error: brace-enclosed initializer not allowed here before ‘{’ token no, without complied c++11 compiler, cannot initialize member array in declaration. have initialize array member in constructor. , don't use open array if know number of elements initialize array.
Read more

cytoscape.js - How to add nodes to Dagre layout with Cytoscape -

-
i trying add nodes dagre graph through cityscape.js. problem nodes not painted. code have: cy.add({ group: "nodes", data: { id:"n0",name:"n0",weight: 75 }, }); $.ajax(url).done(function(jsontree){ var newnodes=[]; for(var i=1;i<6;i++){ //var child = jsontree.result[i]; newnodes.push( { group: "nodes", data: { id: "n"+i, name:"n"+i}}, { group: "edges", data: { id: "e"+i, source: "n0", target: "n"+i } } ); } cy.add(newnodes); any ideas? have used loaded function reload graph not work. not know if have use specific function reload graph. thank in advance. you need add positions new nodes. cytoscape.js docs : it important note positions of newly added nodes must defined when calling cy.add(). nodes can not placed in graph without valid position — otherwise not displayed. yo...
Read more