Queries-Bibliothek
Queries-BibliothekBeitrag von einer anderen WordPress-Seite importieren

Beitrag von einer anderen WordPress-Seite importieren

Diese query importiert einen Beitrag von einer vorgelagerten WordPress-Seite in unsere lokale WordPress-Seite.

Das Gato GraphQL-Plugin (kostenlose Version) muss auf der vorgelagerten Website installiert sein.

Die im Beitrag referenzierten Ressourcen müssen alle lokal vorhanden sein:

  • Der Autor
  • Das Beitragsbild (falls vorhanden)
  • Die Kategorien
  • (Auch Tags, falls diese jedoch noch nicht existieren, werden sie zusammen mit dem Beitrag erstellt, was kein Problem darstellt)

Als gemeinsamen Bezeichner für Ressourcen zwischen der vorgelagerten und der lokalen Seite verwenden wir:

  • Slugs für Kategorien, Tags und Medienelemente
  • Benutzernamen für Benutzer

Falls eine der Ressourcen auf der lokalen Seite nicht existiert, gibt die GraphQL-query einen Fehler aus und bricht den Import ab.

Die Variable $upstreamServerGraphQLEndpointURL ist der Gato GraphQL-Endpunkt auf der vorgelagerten WordPress-Seite, und $postSlug ist der Slug des zu importierenden Beitrags.

query InitializeDynamicVariables
  @configureWarningsOnExportingDuplicateVariable(enabled: false)
{
  initVariablesWithFalse: _echo(value: false)
    @export(as: "requestProducedErrors")
    @export(as: "responseHasErrors")
    @export(as: "postIsMissing")
    @export(as: "postHasAuthor")
    @export(as: "postHasFeaturedImage")
    @export(as: "postHasCategories")
    @export(as: "postHasTags")
    @remove
 
  initVariablesWithNull: _echo(value: null)
    @export(as: "existingAuthorUsername")
    @export(as: "existingFeaturedImageSlug")
    @export(as: "featuredImageMutationInput")
    @remove
 
  initVariablesWithEmptyArray: _echo(value: [])
    @export(as: "existingCategorySlugs")
    @export(as: "existingTagSlugs")
    @remove
}
 
query CheckIfPostExistsLocally($postSlug: String!)
  @depends(on: "InitializeDynamicVariables")
{
  localPost: post(
    by: { slug: $postSlug }
    status: any
  ) {
    id
  }
 
  postAlreadyExists: _notNull(value: $__localPost)
    @export(as: "postAlreadyExists")
}
 
query FailIfPostAlreadyExistsLocally($postSlug: String!)
  @depends(on: "CheckIfPostExistsLocally")
  @include(if: $postAlreadyExists)
{
  errorMessage: _sprintf(
    string: "Post with slug '%s' already exists locally",
    values: [$postSlug]
  ) @remove
 
  _fail(
    message: $__errorMessage
    data: {
      slug: $postSlug
    }
  ) @remove
 
  createPost: _echo(value: null)
}
 
query ConnectToGraphQLAPI(
  $upstreamServerGraphQLEndpointURL: String!
  $postSlug: String!
)
  @depends(on: "FailIfPostAlreadyExistsLocally")
  @skip(if: $postAlreadyExists)
{
  externalData: _sendGraphQLHTTPRequest(input:{
    endpoint: $upstreamServerGraphQLEndpointURL,
    query: """
    
query GetPost($postSlug: String!) {
  post(by: { slug: $postSlug }, status: any) {
    id
    slug
    rawTitle
    rawContent
    rawExcerpt
    author {
      id
      username
    }
    featuredImage {
      id
      slug
    }
    categories {
      id
      slug
    }
    tags {
      id
      slug
    }
  }
}
 
    """,
    variables: [
      {
        name: "postSlug",
        value: $postSlug
      }
    ]
  })
    @export(as: "externalData")
 
  requestProducedErrors: _isNull(value: $__externalData)
    @export(as: "requestProducedErrors")
    @remove
}
 
query ValidateResponse
  @depends(on: "ConnectToGraphQLAPI")
  @skip(if: $postAlreadyExists)
  @skip(if: $requestProducedErrors)
{
  responseHasErrors: _propertyIsSetInJSONObject(
    object: $externalData
    by: {
      key: "errors"
    }
  )
    @export(as: "responseHasErrors")
    @remove
 
  postExists: _propertyIsSetInJSONObject(
    object: $externalData
    by: {
      path: "data.post"
    }
  )
    @remove
    
  postIsMissing: _not(value: $__postExists)
    @export(as: "postIsMissing")
    @remove
}
 
query FailIfResponseHasErrors
  @depends(on: "ValidateResponse")
  @skip(if: $postAlreadyExists)
  @skip(if: $requestProducedErrors)
  @skip(if: $postIsMissing)
  @include(if: $responseHasErrors)
{
  errors: _objectProperty(
    object: $externalData,
    by: {
      key: "errors"
    }
  ) @remove
 
  _fail(
    message: "Executing the GraphQL query against the upstream webserver produced error(s)"
    data: {
      errors: $__errors
    }
  ) @remove
 
  createPost: _echo(value: null)
}
 
query FailIfPostNotExists($postSlug: String!)
  @depends(on: "FailIfResponseHasErrors")
  @skip(if: $requestProducedErrors)
  @include(if: $postIsMissing)
{
  errorMessage: _sprintf(
    string: "There is no post with slug '%s' in the origin",
    values: [$postSlug]
  ) @remove
 
  _fail(
    message: $__errorMessage
    data: {
      slug: $postSlug
    }
  ) @remove
  
  createPost: _echo(value: null)
}
 
query ExportInputs
  @depends(on: "FailIfPostNotExists")
  @skip(if: $postAlreadyExists)
  @skip(if: $requestProducedErrors)
  @skip(if: $responseHasErrors)
  @skip(if: $postIsMissing)
{
  postData: _objectProperty(
    object: $externalData,
    by: { path: "data.post" }
  ) @remove
 
  postTitle: _objectProperty(
    object: $__postData,
    by: { key: "rawTitle" }
  )
    @export(as: "postTitle")
    @remove
 
  postContent: _objectProperty(
    object: $__postData,
    by: { key: "rawContent" }
  )
    @export(as: "postContent")
    @remove
 
  postExcerpt: _objectProperty(
    object: $__postData,
    by: { key: "rawExcerpt" }
  )
    @export(as: "postExcerpt")
    @remove
 
  postAuthorUsername: _objectProperty(
    object: $__postData,
    by: { key: "author" }
  )
    @passOnwards(
      as: "author"
    )
    @applyField(
      name: "_notNull",
      arguments: {
        value: $author
      },
      passOnwardsAs: "hasAuthor"
    )
    @if(condition: $hasAuthor)
      @applyField(
        name: "_objectProperty",
        arguments: {
          object: $author,
          by: { key: "username" }
        },
        setResultInResponse: true
      )
    @export(as: "postAuthorUsername")
    @remove
 
  postHasAuthor: _notNull(
    value: $__postAuthorUsername
  )
    @export(as: "postHasAuthor")
    @remove
 
  postFeaturedImageSlug: _objectProperty(
    object: $__postData,
    by: { key: "featuredImage" }
  )
    @passOnwards(
      as: "featuredImage"
    )
    @applyField(
      name: "_notNull",
      arguments: {
        value: $featuredImage
      },
      passOnwardsAs: "hasFeaturedImage"
    )
    @if(condition: $hasFeaturedImage)
      @applyField(
        name: "_objectProperty",
        arguments: {
          object: $featuredImage,
          by: { key: "slug" }
        },
        setResultInResponse: true
      )
    @export(as: "postFeaturedImageSlug")
    @remove
 
  postHasFeaturedImage: _notNull(
    value: $__postFeaturedImageSlug
  )
    @export(as: "postHasFeaturedImage")
    @remove
 
  postCategorySlugs: _objectProperty(
    object: $__postData,
    by: { key: "categories" }
  )
    @underEachArrayItem(
      passValueOnwardsAs: "category"
    )
      @applyField(
        name: "_objectProperty"
        arguments: {
          object: $category,
          by: {
            key: "slug"
          }
        }
        setResultInResponse: true
      )
    @export(as: "postCategorySlugs")
    @remove
 
  postHasCategories: _notEmpty(
    value: $__postCategorySlugs
  )
    @export(as: "postHasCategories")
    @remove
 
  postTagSlugs: _objectProperty(
    object: $__postData,
    by: { key: "tags" }
  )
    @underEachArrayItem(
      passValueOnwardsAs: "tag"
    )
      @applyField(
        name: "_objectProperty"
        arguments: {
          object: $tag,
          by: {
            key: "slug"
          }
        }
        setResultInResponse: true
      )
    @export(as: "postTagSlugs")
    @remove
 
  postHasTags: _notEmpty(
    value: $__postTagSlugs
  )
    @export(as: "postHasTags")
    @remove
}
 
query ExportExistingResources
  @depends(on: "ExportInputs")
  @skip(if: $postAlreadyExists)
  @skip(if: $requestProducedErrors)
  @skip(if: $responseHasErrors)
  @skip(if: $postIsMissing)
{
  existingAuthorByUsername: user(by: { username: $postAuthorUsername })
    @include(if: $postHasAuthor)
  {
    id
    username @export(as: "existingAuthorUsername")
  }
 
  existingFeaturedImageBySlug: mediaItem(by: { slug: $postFeaturedImageSlug })
    @include(if: $postHasFeaturedImage)
  {
    id
    slug @export(as: "existingFeaturedImageSlug")
  }
 
  existingCategoriesBySlug: postCategories(filter: { slugs: $postCategorySlugs })
    @include(if: $postHasCategories)
  {
    id
    slug @export(as: "existingCategorySlugs", type: LIST)
  }
 
  existingTagsBySlug: postTags(filter: { slugs: $postTagSlugs })
    @include(if: $postHasTags)
  {
    id
    slug @export(as: "existingTagSlugs", type: LIST)
  }
}
 
query ExportMissingResources
  @depends(on: "ExportExistingResources")
  @skip(if: $postAlreadyExists)
  @skip(if: $requestProducedErrors)
  @skip(if: $responseHasErrors)
  @skip(if: $postIsMissing)
{
  isAuthorMissing: _notEquals(
    value1: $postAuthorUsername,
    value2: $existingAuthorUsername
  ) @export(as: "isAuthorMissing")
  
  isFeaturedImageMissing: _notEquals(
    value1: $postFeaturedImageSlug,
    value2: $existingFeaturedImageSlug
  ) @export(as: "isFeaturedImageMissing")
 
  missingCategorySlugs: _arrayDiff(
    arrays: [$postCategorySlugs, $existingCategorySlugs]
  ) @export(as: "missingCategorySlugs")
  areCategoriesMissing: _notEmpty(
    value: $__missingCategorySlugs
  ) @export(as: "areCategoriesMissing")
 
  # missingTagSlugs: _arrayDiff(
  #   arrays: [$postTagSlugs, $existingTagSlugs]
  # ) @export(as: "missingTagSlugs")
  # areTagsMissing: _notEmpty(
  #   value: $__missingTagSlugs
  # ) @export(as: "areTagsMissing")
 
  isAnyResourceMissing: _or(
    values: [
      $__isAuthorMissing,
      $__isFeaturedImageMissing,
      $__areCategoriesMissing,
      # $__areTagsMissing,
    ]
  ) @export(as: "isAnyResourceMissing")
}
 
query FailIfAnyResourceIsMissing
  @depends(on: "ExportMissingResources")
  @skip(if: $postAlreadyExists)
  @skip(if: $requestProducedErrors)
  @skip(if: $postIsMissing)
  @skip(if: $responseHasErrors)
  @include(if: $isAnyResourceMissing)
{
  performingValidations: id
    @if(condition: $isAuthorMissing)
      @fail(
        message: "Author is missing in local site"
        data: {
          missingAuthorByUsername: $postAuthorUsername
        }
        condition: ALWAYS
      )
    @if(condition: $isFeaturedImageMissing)
      @fail(
        message: "Featured image is missing in local site"
        data: {
          missingFeaturedImageBySlug: $postFeaturedImageSlug
        }
        condition: ALWAYS
      )
    @if(condition: $areCategoriesMissing)
      @fail(
        message: "Categories are missing in local site"
        data: {
          missingCategoriesBySlug: $missingCategorySlugs
        }
        condition: ALWAYS
      )
    # @if(condition: $areTagsMissing)
    #   @fail(
    #     message: "Tags are missing in local site"
    #     data: {
    #       missingTagBySlug: $missingTagSlugs
    #     }
    #     condition: ALWAYS
    #   )
  
  createPost: _echo(value: null)
}
 
query ExportMutationInputs
  @depends(on: "FailIfAnyResourceIsMissing")
  @skip(if: $postAlreadyExists)
  @skip(if: $requestProducedErrors)
  @skip(if: $responseHasErrors)
  @skip(if: $postIsMissing)
  @skip(if: $isAnyResourceMissing)
{
  featuredImageMutationInput: _echo(value: {
    slug: $postFeaturedImageSlug
  })
    @include(if: $postHasFeaturedImage)
    @export(as: "featuredImageMutationInput")
    @remove
}
 
mutation ImportPostFromWPSite(
  $postSlug: String!
)
  @depends(on: "ExportMutationInputs")
  @skip(if: $postAlreadyExists)
  @skip(if: $requestProducedErrors)
  @skip(if: $responseHasErrors)
  @skip(if: $postIsMissing)
  @skip(if: $isAnyResourceMissing)
{
  createPost(input: {
    status: draft,
    slug: $postSlug
    title: $postTitle
    contentAs: {
      html: $postContent
    },
    excerpt: $postExcerpt
    authorBy: {
      username: $postAuthorUsername
    },
    featuredImageBy: $featuredImageMutationInput,
    categoriesBy: {
      slugs: $postCategorySlugs
    },
    tagsBy: {
      slugs: $postTagSlugs
    }
  }) {
    status
    errors {
      __typename
      ...on ErrorPayload {
        message
      }
    }
    post {
      id
      date
      status
 
      slug
      title
      content
      excerpt
 
      author {
        id
        username
      }
      featuredImage {
        id
        slug
      }
      categories {
        id
        slug
      }
      tags {
        id
        slug
      }
    }
  }
}