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< li class = "header" > Introduction< / li >
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Introduction
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< li class = "header" > Basics< / li >
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Route Syntax
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Router
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Path-based Routing
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Name-based Routing
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Route Data
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Route Data Validation
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Route Conflicts
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< li class = "header" > Coercion< / li >
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Coercion Explained
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Plumatic Schema
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Clojure.spec
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Data-specs
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< li class = "header" > Ring< / li >
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< a href = "../ring/ring.html" >
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Ring-router
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< li class = "chapter " data-level = "4.2" data-path = "../ring/reverse_routing.html" >
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< a href = "../ring/reverse_routing.html" >
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Reverse-routing
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< a href = "../ring/default_handler.html" >
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Default handler
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Slash handler
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Static Resources
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< a href = "../ring/dynamic_extensions.html" >
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Dynamic Extensions
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< li class = "chapter " data-level = "4.7" data-path = "../ring/data_driven_middleware.html" >
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Data-driven Middleware
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< li class = "chapter " data-level = "4.8" data-path = "../ring/transforming_middleware_chain.html" >
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< a href = "../ring/transforming_middleware_chain.html" >
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Transforming Middleware Chain
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< a href = "../ring/middleware_registry.html" >
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Middleware Registry
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< li class = "chapter " data-level = "4.10" data-path = "../ring/default_middleware.html" >
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< a href = "../ring/default_middleware.html" >
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Default Middleware
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< li class = "chapter " data-level = "4.11" data-path = "../ring/coercion.html" >
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< a href = "../ring/coercion.html" >
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Ring Coercion
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< li class = "chapter " data-level = "4.12" data-path = "../ring/route_data_validation.html" >
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< a href = "../ring/route_data_validation.html" >
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Route Data Validation
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< li class = "chapter " data-level = "4.13" data-path = "../ring/compiling_middleware.html" >
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< a href = "../ring/compiling_middleware.html" >
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Compiling Middleware
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< li class = "chapter " data-level = "4.14" data-path = "../ring/swagger.html" >
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< a href = "../ring/swagger.html" >
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Swagger Support
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< a href = "../ring/RESTful_form_methods.html" >
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RESTful form methods
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< li class = "header" > HTTP< / li >
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< li class = "chapter " data-level = "5.1" data-path = "../http/interceptors.html" >
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< a href = "../http/interceptors.html" >
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Interceptors
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< a href = "../http/pedestal.html" >
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Pedestal
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Sieppari
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< a href = "../http/default_interceptors.html" >
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Default Interceptors
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Transforming Interceptor Chain
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< li class = "header" > Frontend< / li >
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< li class = "chapter " data-level = "6.1" data-path = "../frontend/basics.html" >
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Basics
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Browser integration
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Controllers
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< a href = "../advanced/configuring_routers.html" >
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Configuring Routers
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< li class = "chapter " data-level = "7.2" data-path = "../advanced/composing_routers.html" >
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< a href = "../advanced/composing_routers.html" >
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Composing Routers
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< li class = "chapter " data-level = "7.3" data-path = "../advanced/different_routers.html" >
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< a href = "../advanced/different_routers.html" >
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Different Routers
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< li class = "chapter " data-level = "7.4" data-path = "../advanced/route_validation.html" >
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< a href = "../advanced/route_validation.html" >
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Route Validation
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< li class = "chapter " data-level = "7.5" data-path = "../advanced/dev_workflow.html" >
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< a href = "../advanced/dev_workflow.html" >
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Dev Workflow
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< li class = "chapter " data-level = "7.6" data-path = "../advanced/shared_routes.html" >
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< a href = "../advanced/shared_routes.html" >
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Shared Routes
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Performance
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Development Instructions
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< / li >
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FAQ
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<!-- Title -->
< h1 >
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< a href = ".." > Clojure.spec< / a >
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< section class = "normal markdown-section" >
< h1 id = "clojurespec-coercion" > Clojure.spec Coercion< / h1 >
< p > The < a href = "https://clojure.org/guides/spec" target = "_blank" > clojure.spec< / a > library specifies the structure of data, validates or destructures it, and can generate data based on the spec.< / p >
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< h2 id = "warning" > Warning< / h2 >
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< p > < code > clojure.spec< / code > by itself doesn' t support coercion. < code > reitit< / code > uses < a href = "https://github.com/metosin/spec-tools" target = "_blank" > spec-tools< / a > that adds coercion to spec. Like < code > clojure.spec< / code > , it' s alpha as it leans both on spec walking and < code > clojure.spec.alpha/conform< / code > , which is concidered a spec internal, that might be changed or removed later.< / p >
< h2 id = "usage" > Usage< / h2 >
< p > For simple specs (core predicates, < code > spec-tools.core/spec< / code > , < code > s/and< / code > , < code > s/or< / code > , < code > s/coll-of< / code > , < code > s/keys< / code > , < code > s/map-of< / code > , < code > s/nillable< / code > and < code > s/every< / code > ), the transformation is inferred using < a href = "https://github.com/metosin/spec-tools#spec-walker" target = "_blank" > spec-walker< / a > and is automatic. To support all specs (like regex-specs), specs need to be wrapped into < a href = "https://github.com/metosin/spec-tools/blob/master/README.md#spec-records" target = "_blank" > Spec Records< / a > .< / p >
< p > There are < a href = "https://dev.clojure.org/jira/browse/CLJ-2116" target = "_blank" > CLJ-2116< / a > and < a href = "https://dev.clojure.org/jira/browse/CLJ-2251" target = "_blank" > CLJ-2251< / a > that would help solve this elegantly. Go vote ' em up.< / p >
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< h2 id = "example" > Example< / h2 >
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< pre > < code class = "lang-clj" > (< span class = "hljs-name" > require< / span > ' [reitit.coercion.spec])
(< span class = "hljs-name" > require< / span > ' [reitit.coercion < span class = "hljs-symbol" > :as< / span > coercion])
(< span class = "hljs-name" > require< / span > ' [spec-tools.spec < span class = "hljs-symbol" > :as< / span > spec])
(< span class = "hljs-name" > require< / span > ' [clojure.spec.alpha < span class = "hljs-symbol" > :as< / span > s])
(< span class = "hljs-name" > require< / span > ' [reitit.core < span class = "hljs-symbol" > :as< / span > r])
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< span class = "hljs-comment" > ;; simple specs, inferred< / span >
(< span class = "hljs-name" > s/def< / span > < span class = "hljs-symbol" > ::company< / span > string?)
(< span class = "hljs-name" > s/def< / span > < span class = "hljs-symbol" > ::user-id< / span > int?)
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(< span class = "hljs-name" > s/def< / span > < span class = "hljs-symbol" > ::path-params< / span > (< span class = "hljs-name" > s/keys< / span > < span class = "hljs-symbol" > :req-un< / span > [< span class = "hljs-symbol" > ::company< / span > < span class = "hljs-symbol" > ::user-id< / span > ]))
(< span class = "hljs-name" > < span class = "hljs-builtin-name" > def< / span > < / span > router
(< span class = "hljs-name" > r/router< / span >
[< span class = "hljs-string" > " /:company/users/:user-id" < / span > {< span class = "hljs-symbol" > :name< / span > < span class = "hljs-symbol" > ::user-view< / span >
< span class = "hljs-symbol" > :coercion< / span > reitit.coercion.spec/coercion
< span class = "hljs-symbol" > :parameters< / span > {< span class = "hljs-symbol" > :path< / span > < span class = "hljs-symbol" > ::path-params< / span > }}]
{< span class = "hljs-symbol" > :compile< / span > coercion/compile-request-coercers}))
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(< span class = "hljs-name" > < span class = "hljs-builtin-name" > defn< / span > < / span > match-by-path-and-coerce! [path]
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(< span class = "hljs-name" > < span class = "hljs-builtin-name" > if-let< / span > < / span > [match (< span class = "hljs-name" > r/match-by-path< / span > router path)]
(< span class = "hljs-name" > < span class = "hljs-builtin-name" > assoc< / span > < / span > match < span class = "hljs-symbol" > :parameters< / span > (< span class = "hljs-name" > coercion/coerce!< / span > match))))
< / code > < / pre >
< p > Successful coercion:< / p >
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< pre > < code class = "lang-clj" > (< span class = "hljs-name" > match-by-path-and-coerce!< / span > < span class = "hljs-string" > " /metosin/users/123" < / span > )
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< span class = "hljs-comment" > ; #Match{:template " /:company/users/:user-id" ,< / span >
< span class = "hljs-comment" > ; :data {:name :user/user-view,< / span >
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< span class = "hljs-comment" > ; :coercion < < :spec> > < / span >
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< span class = "hljs-comment" > ; :parameters {:path ::path-params}},< / span >
< span class = "hljs-comment" > ; :result {:path #object[reitit.coercion$request_coercer$]},< / span >
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< span class = "hljs-comment" > ; :path-params {:company " metosin" , :user-id " 123" },< / span >
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< span class = "hljs-comment" > ; :parameters {:path {:company " metosin" , :user-id 123}}< / span >
< span class = "hljs-comment" > ; :path " /metosin/users/123" }< / span >
< / code > < / pre >
< p > Failing coercion:< / p >
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< pre > < code class = "lang-clj" > (< span class = "hljs-name" > match-by-path-and-coerce!< / span > < span class = "hljs-string" > " /metosin/users/ikitommi" < / span > )
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< span class = "hljs-comment" > ; => ExceptionInfo Request coercion failed...< / span >
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< / code > < / pre >
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< h2 id = "deeply-nested" > Deeply nested< / h2 >
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< p > Spec-tools allow deeply nested specs to be coerced. One can test the coercion easily in the REPL.< / p >
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< p > Define some specs:< / p >
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< pre > < code class = "lang-clj" > (< span class = "hljs-name" > require< / span > ' [clojure.spec.alpha < span class = "hljs-symbol" > :as< / span > s])
(< span class = "hljs-name" > require< / span > ' [spec-tools.core < span class = "hljs-symbol" > :as< / span > st])
(< span class = "hljs-name" > s/def< / span > < span class = "hljs-symbol" > :sku/id< / span > keyword?)
(< span class = "hljs-name" > s/def< / span > < span class = "hljs-symbol" > ::sku< / span > (< span class = "hljs-name" > s/keys< / span > < span class = "hljs-symbol" > :req-un< / span > [< span class = "hljs-symbol" > :sku/id< / span > ]))
(< span class = "hljs-name" > s/def< / span > < span class = "hljs-symbol" > ::skus< / span > (< span class = "hljs-name" > s/coll-of< / span > < span class = "hljs-symbol" > ::sku< / span > < span class = "hljs-symbol" > :into< / span > []))
(< span class = "hljs-name" > s/def< / span > < span class = "hljs-symbol" > :photo/id< / span > int?)
(< span class = "hljs-name" > s/def< / span > < span class = "hljs-symbol" > ::photo< / span > (< span class = "hljs-name" > s/keys< / span > < span class = "hljs-symbol" > :req-un< / span > [< span class = "hljs-symbol" > :photo/id< / span > ]))
(< span class = "hljs-name" > s/def< / span > < span class = "hljs-symbol" > ::photos< / span > (< span class = "hljs-name" > s/coll-of< / span > < span class = "hljs-symbol" > ::photo< / span > < span class = "hljs-symbol" > :into< / span > []))
(< span class = "hljs-name" > s/def< / span > < span class = "hljs-symbol" > ::my-json-api< / span > (< span class = "hljs-name" > s/keys< / span > < span class = "hljs-symbol" > :req-un< / span > [< span class = "hljs-symbol" > ::skus< / span > < span class = "hljs-symbol" > ::photos< / span > ]))
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< / code > < / pre >
< p > Apply a string-> edn coercion to the data:< / p >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > st/coerce< / span >
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< span class = "hljs-symbol" > ::my-json-api< / span >
{< span class = "hljs-symbol" > :skus< / span > [{< span class = "hljs-symbol" > :id< / span > < span class = "hljs-string" > " 123" < / span > }]
< span class = "hljs-symbol" > :photos< / span > [{< span class = "hljs-symbol" > :id< / span > < span class = "hljs-string" > " 123" < / span > }]}
st/string-transformer)
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< span class = "hljs-comment" > ; {:skus [{:id :123}]< / span >
< span class = "hljs-comment" > ; :photos [{:id 123}]}< / span >
< / code > < / pre >
< p > Apply a json-> edn coercion to the data:< / p >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > st/coerce< / span >
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< span class = "hljs-symbol" > ::my-json-api< / span >
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{< span class = "hljs-symbol" > :skus< / span > [{< span class = "hljs-symbol" > :id< / span > < span class = "hljs-string" > " 123" < / span > }]
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< span class = "hljs-symbol" > :photos< / span > [{< span class = "hljs-symbol" > :id< / span > < span class = "hljs-string" > " 123" < / span > }]}
st/json-transformer)
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< span class = "hljs-comment" > ; {:skus [{:id :123}]< / span >
< span class = "hljs-comment" > ; :photos [{:id " 123" }]}< / span >
< / code > < / pre >
< p > By default, reitit uses custom transformers that also strip out extra keys from < code > s/keys< / code > specs:< / p >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > require< / span > ' [reitit.coercion.spec < span class = "hljs-symbol" > :as< / span > rcs])
(< span class = "hljs-name" > st/coerce< / span >
< span class = "hljs-symbol" > ::my-json-api< / span >
{< span class = "hljs-symbol" > :TOO< / span > < span class = "hljs-string" > " MUCH" < / span >
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< span class = "hljs-symbol" > :skus< / span > [{< span class = "hljs-symbol" > :id< / span > < span class = "hljs-string" > " 123" < / span >
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< span class = "hljs-symbol" > :INFOR< / span > < span class = "hljs-string" > " MATION" < / span > }]
< span class = "hljs-symbol" > :photos< / span > [{< span class = "hljs-symbol" > :id< / span > < span class = "hljs-string" > " 123" < / span >
< span class = "hljs-symbol" > :HERE< / span > < span class = "hljs-string" > " TOO" < / span > }]}
rcs/json-transformer)
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< span class = "hljs-comment" > ; {:skus [{:id :123}]< / span >
< span class = "hljs-comment" > ; :photos [{:id " 123" }]}< / span >
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< / code > < / pre >
< / section >
< / div >
< div class = "search-results" >
< div class = "has-results" >
< h1 class = "search-results-title" > < span class = 'search-results-count' > < / span > results matching "< span class = 'search-query' > < / span > "< / h1 >
< ul class = "search-results-list" > < / ul >
< / div >
< div class = "no-results" >
< h1 class = "search-results-title" > No results matching "< span class = 'search-query' > < / span > "< / h1 >
< / div >
< / div >
< / div >
< / div >
< / div >
< / div >
< a href = "schema_coercion.html" class = "navigation navigation-prev " aria-label = "Previous page: Plumatic Schema" >
< i class = "fa fa-angle-left" > < / i >
< / a >
< a href = "data_spec_coercion.html" class = "navigation navigation-next " aria-label = "Next page: Data-specs" >
< i class = "fa fa-angle-right" > < / i >
< / a >
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