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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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Error Messages
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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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Ring-router
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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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Dynamic Extensions
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< a href = "../ring/data_driven_middleware.html" >
Data-driven Middleware
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< a href = "../ring/transforming_middleware_chain.html" >
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Transforming Middleware Chain
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< li class = "chapter " data-level = "4.9" data-path = "../ring/middleware_registry.html" >
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< a href = "../ring/middleware_registry.html" >
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Middleware Registry
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Exception Handling with Ring
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< a href = "../ring/default_middleware.html" >
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Default Middleware
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Content Negotiation
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< a href = "../ring/coercion.html" >
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Pluggable Coercion
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< li class = "chapter " data-level = "4.14" 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 = "4.15" 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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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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< a href = "../http/sieppari.html" >
Sieppari
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< a href = "../http/default_interceptors.html" >
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Default Interceptors
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< li class = "chapter " data-level = "5.5" data-path = "../http/transforming_interceptor_chain.html" >
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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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< li class = "header" > Advanced< / li >
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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 >
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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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< a href = "../advanced/dev_workflow.html" >
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Dev Workflow
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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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< / li >
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Development Instructions
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< li class = "chapter " data-level = "8.3" data-path = "../faq.html" >
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FAQ
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<!-- Title -->
< h1 >
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< a href = ".." > Route Data Validation< / a >
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< h1 id = "route-data-validation" > Route Data Validation< / h1 >
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< p > Route data can be anything, so it' s easy to go wrong. Accidentally adding a < code > :role< / code > key instead of < code > :roles< / code > might hinder the whole routing app without any authorization in place.< / p >
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< p > To fail fast, we could use the custom < code > :coerce< / code > and < code > :compile< / code > hooks to apply data validation and throw exceptions on first sighted problem.< / p >
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< p > But there is a better way. Router has a < code > :validation< / code > hook to validate the whole route tree after it' s successfully compiled. It expects a 2-arity function < code > routes opts => ()< / code > that can side-effect in case of validation errors.< / p >
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< h2 id = "clojurespec" > clojure.spec< / h2 >
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< p > Namespace < code > reitit.spec< / code > contains specs for main parts of < code > reitit.core< / code > and a helper function < code > validate< / code > that runs spec validation for all route data and throws an exception if any errors are found.< / p >
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< p > A Router with invalid route data:< / p >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > require< / span > ' [reitit.core < span class = "hljs-symbol" > :as< / span > r])
(< span class = "hljs-name" > r/router< / span >
[< span class = "hljs-string" > " /api" < / span > {< span class = "hljs-symbol" > :handler< / span > < span class = "hljs-string" > " identity" < / span > }])
< span class = "hljs-comment" > ; #object[reitit.core$...]< / span >
< / code > < / pre >
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< p > Failing fast with < code > clojure.spec< / code > validation turned on:< / p >
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< pre > < code class = "lang-clj" > (< span class = "hljs-name" > require< / span > ' [reitit.spec < span class = "hljs-symbol" > :as< / span > rs])
(< span class = "hljs-name" > r/router< / span >
[< span class = "hljs-string" > " /api" < / span > {< span class = "hljs-symbol" > :handler< / span > < span class = "hljs-string" > " identity" < / span > }]
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{< span class = "hljs-symbol" > :validate< / span > rs/validate})
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< span class = "hljs-comment" > ; CompilerException clojure.lang.ExceptionInfo: Invalid route data:< / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ; -- On route -----------------------< / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ; " /api" < / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ; In: [:handler] val: " identity" fails spec: :reitit.spec/handler at: [:handler] predicate: fn?< / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ; {:problems (#reitit.spec.Problem{:path " /api" , :scope nil, :data {:handler " identity" }, :spec :reitit.spec/default-data, :problems #:clojure.spec.alpha{:problems ({:path [:handler], :pred clojure.core/fn?, :val " identity" , :via [:reitit.spec/default-data :reitit.spec/handler], :in [:handler]}), :spec :reitit.spec/default-data, :value {:handler " identity" }}})}, compiling: ...< / span >
< / code > < / pre >
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< h3 id = "pretty-errors" > Pretty errors< / h3 >
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< p > Turning on < a href = "error_messages.html#pretty-errors" > Pretty Errors< / a > will give much nicer error messages:< / p >
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< pre > < code class = "lang-clj" > (< span class = "hljs-name" > require< / span > ' [reitit.dev.pretty < span class = "hljs-symbol" > :as< / span > pretty])
(< span class = "hljs-name" > r/router< / span >
[< span class = "hljs-string" > " /api" < / span > {< span class = "hljs-symbol" > :handler< / span > < span class = "hljs-string" > " identity" < / span > }]
{< span class = "hljs-symbol" > :validate< / span > rs/validate
< span class = "hljs-symbol" > :exception< / span > pretty/exception})
< / code > < / pre >
< p > < img src = "../images/pretty-error.png" alt = "Pretty error" > < / p >
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< h3 id = "customizing-spec-validation" > Customizing spec validation< / h3 >
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< p > < code > rs/validate< / code > reads the following router options:< / p >
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< table >
< thead >
< tr >
< th > key< / th >
< th > description< / th >
< / tr >
< / thead >
< tbody >
< tr >
< td > < code > :spec< / code > < / td >
< td > the spec to verify the route data (default < code > ::rs/default-data< / code > )< / td >
< / tr >
< tr >
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< td > < code > :reitit.spec/wrap< / code > < / td >
< td > function of < code > spec => spec< / code > to wrap all route specs< / td >
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< / tr >
< / tbody >
< / table >
< p > < strong > NOTE< / strong > : < code > clojure.spec< / code > implicitly validates all values with fully-qualified keys if specs exist with the same name.< / p >
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< p > Invalid spec value:< / 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" > s/def< / span > < span class = "hljs-symbol" > ::role< / span > #{< span class = "hljs-symbol" > :admin< / span > < span class = "hljs-symbol" > :manager< / span > })
(< span class = "hljs-name" > s/def< / span > < span class = "hljs-symbol" > ::roles< / span > (< span class = "hljs-name" > s/coll-of< / span > < span class = "hljs-symbol" > ::role< / span > < span class = "hljs-symbol" > :into< / span > #{}))
(< span class = "hljs-name" > r/router< / span >
[< span class = "hljs-string" > " /api" < / span > {< span class = "hljs-symbol" > :handler< / span > identity
< span class = "hljs-symbol" > ::roles< / span > #{< span class = "hljs-symbol" > :adminz< / span > }}]
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{< span class = "hljs-symbol" > :validate< / span > rs/validate
< span class = "hljs-symbol" > :exception< / span > pretty/exception})
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< / code > < / pre >
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< p > < img src = "../images/invalid_roles.png" alt = "Invalid Role Error" > < / p >
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< h2 id = "closed-specs" > Closed Specs< / h2 >
< p > To fail-fast on non-defined and misspelled keys on route data, we can close the specs using < code > :reitit.spec/wrap< / code > options with value of < code > spec-tools.spell/closed< / code > that closed the top-level specs.< / p >
< p > Requiring a< code > :description< / code > and validating using closed specs:< / p >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > require< / span > ' [spec-tools.spell < span class = "hljs-symbol" > :as< / span > spell])
(< span class = "hljs-name" > s/def< / span > < span class = "hljs-symbol" > ::description< / span > string?)
(< span class = "hljs-name" > r/router< / span >
[< span class = "hljs-string" > " /api" < / span > {< span class = "hljs-symbol" > :summary< / span > < span class = "hljs-string" > " kikka" < / span > }]
{< span class = "hljs-symbol" > :validate< / span > rs/validate
< span class = "hljs-symbol" > :spec< / span > (< span class = "hljs-name" > s/merge< / span > < span class = "hljs-symbol" > ::rs/default-data< / span >
(< span class = "hljs-name" > s/keys< / span > < span class = "hljs-symbol" > :req-un< / span > [< span class = "hljs-symbol" > ::description< / span > ]))
< span class = "hljs-symbol" > ::rs/wrap< / span > spell/closed
< span class = "hljs-symbol" > :exception< / span > pretty/exception})
< / code > < / pre >
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< p > < img src = "../images/closed-spec1.png" alt = "Closed Spec error" > < / p >
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< p > It catches also typing errors:< / p >
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< pre > < code class = "lang-clj" > (< span class = "hljs-name" > r/router< / span >
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[< span class = "hljs-string" > " /api" < / span > {< span class = "hljs-symbol" > :descriptionz< / span > < span class = "hljs-string" > " kikka" < / span > }]
{< span class = "hljs-symbol" > :validate< / span > rs/validate
< span class = "hljs-symbol" > :spec< / span > (< span class = "hljs-name" > s/merge< / span > < span class = "hljs-symbol" > ::rs/default-data< / span >
(< span class = "hljs-name" > s/keys< / span > < span class = "hljs-symbol" > :req-un< / span > [< span class = "hljs-symbol" > ::description< / span > ]))
< span class = "hljs-symbol" > ::rs/wrap< / span > spell/closed
< span class = "hljs-symbol" > :exception< / span > pretty/exception})
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< / code > < / pre >
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< p > < img src = "../images/closed-spec2.png" alt = "Closed Spec error" > < / p >
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< / 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 = "route_data.html" class = "navigation navigation-prev " aria-label = "Previous page: Route Data" >
< i class = "fa fa-angle-left" > < / i >
< / a >
< a href = "route_conflicts.html" class = "navigation navigation-next " aria-label = "Next page: Route Conflicts" >
< i class = "fa fa-angle-right" > < / i >
< / a >
< / div >
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< script src = "../gitbook/gitbook-plugin-editlink/plugin.js" > < / script >
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