fix: path-item $ref produces/consumes inheritance (via #5049)

* implement a selector for consumes options

* fix incorrect comment, test names

* add `consumesOptionsFor` selector

* use `consumesOptionsFor` and drop `operationConsumes`

src/core/components/operation.jsx

@@ -83,7 +83,6 @@ export default class Operation extends PureComponent {
 
     let operation = operationProps.getIn(["op"])
     let responses = operation.get("responses")
-    let produces = operation.get("produces")
     let parameters = getList(operation, ["parameters"])
     let operationScheme = specSelectors.operationScheme(path, method)
     let isShownKey = ["operations", tag, operationId]
@@ -216,7 +215,7 @@ export default class Operation extends PureComponent {
                     specSelectors={ specSelectors }
                     oas3Actions={oas3Actions}
                     specActions={ specActions }
-                    produces={ produces }
+                    produces={specSelectors.producesOptionsFor([path, method]) }
                     producesValue={ specSelectors.currentProducesFor([path, method]) }
                     specPath={specPath.push("responses")}
                     path={ path }

src/core/components/parameter-row.jsx

@@ -129,7 +129,7 @@ export default class ParameterRow extends Component {
       : <ParamBody getComponent={getComponent}
                    fn={fn}
                    param={param}
-                   consumes={ specSelectors.operationConsumes(pathMethod) }
+                   consumes={ specSelectors.consumesOptionsFor(pathMethod) }
                    consumesValue={ specSelectors.contentTypeValues(pathMethod).get("requestContentType") }
                    onChange={this.onChangeWrapper}
                    onChangeConsumes={onChangeConsumes}

src/core/plugins/spec/selectors.js

@@ -401,12 +401,6 @@ export function contentTypeValues(state, pathMethod) {
   })
 }
 
-// Get the consumes/produces by path
-export function operationConsumes(state, pathMethod) {
-  pathMethod = pathMethod || []
-  return specJsonWithResolvedSubtrees(state).getIn(["paths", ...pathMethod, "consumes"], fromJS({}))
-}
-
 // Get the currently selected produces value for an operation
 export function currentProducesFor(state, pathMethod) {
   pathMethod = pathMethod || []
@@ -425,6 +419,48 @@ export function currentProducesFor(state, pathMethod) {
 
 }
 
+// Get the produces options for an operation
+export function producesOptionsFor(state, pathMethod) {
+  pathMethod = pathMethod || []
+
+  const spec = specJsonWithResolvedSubtrees(state)
+  const operation = spec.getIn([ "paths", ...pathMethod], null)
+
+  if(operation === null) {
+    // return nothing if the operation does not exist
+    return
+  }
+
+  const [path] = pathMethod
+
+  const operationProduces = operation.get("produces", null)
+  const pathItemProduces = spec.getIn(["paths", path, "produces"], null)
+  const globalProduces = spec.getIn(["produces"], null)
+
+  return operationProduces || pathItemProduces || globalProduces
+}
+
+// Get the consumes options for an operation
+export function consumesOptionsFor(state, pathMethod) {
+  pathMethod = pathMethod || []
+
+  const spec = specJsonWithResolvedSubtrees(state)
+  const operation = spec.getIn(["paths", ...pathMethod], null)
+
+  if (operation === null) {
+    // return nothing if the operation does not exist
+    return
+  }
+
+  const [path] = pathMethod
+
+  const operationConsumes = operation.get("consumes", null)
+  const pathItemConsumes = spec.getIn(["paths", path, "consumes"], null)
+  const globalConsumes = spec.getIn(["consumes"], null)
+
+  return operationConsumes || pathItemConsumes || globalConsumes
+}
+
 export const operationScheme = ( state, path, method ) => {
   let url = state.get("url")
   let matchResult = url.match(/^([a-z][a-z0-9+\-.]*):/)